Merge pull request '[fix] LCENavigationView: remove phantom glass button, center title safely' (#11) from fix/navigation/glass-duplicate-button into main

Reviewed-on: #11

Documentation/API.md

@@ -1,5 +1,8 @@
 # `API` — networking for LCEssentials
 
+Part of the reference set: [Extensions.md](Extensions.md) ·
+[SwiftUI.md](SwiftUI.md) · [UIKit.md](UIKit.md).
+
 `API` is an `actor` that wraps `URLSession` for JSON REST calls and multipart
 uploads. One line to send a typed request, decode the response, and get a
 consistent error — instead of re-writing the same `URLRequest` / status-code /

Documentation/SwiftUI.md

@@ -0,0 +1,117 @@
+# LCEssentials — SwiftUI
+
+SwiftUI components and `View` helpers. Foundation/value-type helpers are in
+[Extensions.md](Extensions.md); UIKit-era helpers in [UIKit.md](UIKit.md).
+
+Every section is a collapsible block — click a heading to expand it.
+
+## Contents
+
+- [Navigation](#navigation)
+- [View helpers](#view-helpers)
+
+---
+
+## Navigation
+
+<details>
+<summary><b>LCENavigationView</b> — customizable navigation bar (iOS 15+)</summary>
+
+A drop-in replacement for the system navigation bar with left/right buttons,
+title + subtitle, background colour, and a hide toggle. Configuration methods
+return `self`, so they chain. **Per the workspace iOS standards, this component
+is mandatory on new SwiftUI screens instead of a hand-rolled bar.**
+
+`@available(iOS 15, *)`, iOS only.
+
+### `init(title: (any View) = Text(""), subTitle: (any View) = Text(""), @ViewBuilder content: () -> Content)`
+
+The `content` closure is everything shown **below** the bar.
+
+```swift
+LCENavigationView(title: Text("Profile")) {
+    ScrollView {
+        ProfileForm()
+    }
+}
+```
+
+### `func setTitle(text: (any View) = Text(""), subTitle: (any View)? = nil) -> LCENavigationView`
+
+Set (or replace) the title and optional subtitle. Passing no `subTitle` hides
+the subtitle row.
+
+```swift
+LCENavigationView { Content() }
+    .setTitle(text: Text("Orders"), subTitle: Text("32 open"))
+```
+
+### `func setLeftButton(text: Text = Text(""), image: (any View)? = nil, action: @escaping () -> Void) -> LCENavigationView`
+
+Configure the leading button. If the trailing button has no text/image yet, a
+transparent placeholder is added on that side so the title stays centred.
+
+```swift
+.setLeftButton(text: Text("Back"), image: Image(systemName: "chevron.left")) {
+    dismiss()
+}
+```
+
+### `func setRightButton(text: Text = Text(""), image: (any View)? = nil, action: @escaping () -> Void) -> LCENavigationView`
+
+Configure the trailing button (same placeholder behaviour for the leading side).
+
+```swift
+.setRightButton(image: Image(systemName: "plus")) {
+    showingNewItem = true
+}
+```
+
+### `func hideNavigationView(_ hide: Bool) -> LCENavigationView`
+
+Show or hide the whole bar (the content stays).
+
+```swift
+.hideNavigationView(isFullScreenMedia)
+```
+
+### `func setNavigationBarBackgroundColor(_ color: Color) -> LCENavigationView`
+
+Bar background colour (extends into the top safe area). Defaults to `.clear`.
+
+```swift
+.setNavigationBarBackgroundColor(.blue.opacity(0.1))
+```
+
+### Full example
+
+```swift
+struct OrdersScreen: View {
+    @Environment(\.dismiss) private var dismiss
+    @State private var showingNew = false
+
+    var body: some View {
+        LCENavigationView(title: Text("Orders")) {
+            OrdersList()
+        }
+        .setLeftButton(text: Text("Back"),
+                       image: Image(systemName: "chevron.left")) { dismiss() }
+        .setRightButton(image: Image(systemName: "plus")) { showingNew = true }
+        .setNavigationBarBackgroundColor(Color(.systemBackground))
+    }
+}
+```
+
+> `LCENavigationState` (the `@Published` backing store) and the reflection-based
+> `Text.string` / tag helpers in `View+Ext.swift` are `internal` implementation
+> details — not part of the public API.
+
+</details>
+
+---
+
+## View helpers
+
+There are currently no public standalone `View` extensions — the `getTag` /
+`extractTag` reflection utilities in `SwiftUI/View+Ext.swift` are `internal` and
+exist only to support `LCENavigationView`'s subtitle handling.

Documentation/UIKit.md

@@ -0,0 +1,815 @@
+# LCEssentials — UIKit
+
+UIKit-era helpers: programmatic layout & constraints, view/control extensions,
+navigation, table/collection helpers, and drop-in components (image picker, image
+zoom, snackbar, GIF loading).
+
+Foundation/value-type helpers are in [Extensions.md](Extensions.md); SwiftUI
+helpers in [SwiftUI.md](SwiftUI.md).
+
+Every section is a collapsible block — click a heading to expand it.
+
+## Contents
+
+- [Layout & Constraints](#layout--constraints)
+- [Views & Controls](#views--controls)
+- [Navigation & Controllers](#navigation--controllers)
+- [Collections & Tables](#collections--tables)
+- [Media & Components](#media--components)
+
+---
+
+## Layout & Constraints
+
+<details>
+<summary><b>UIView</b> — programmatic constraints, chainable anchors</summary>
+
+### `enum AnchorType`
+The anchor to pin when using `setConstraintsTo`. Cases: `all`, `top`, `bottom`,
+`leading`, `trailing`, `left`, `right`, `centerX`, `centerY`, `width`, `heigth`
+*(sic)*, `topToBottom`, `bottomToTop`, `leadingToTrailing`, `trailingToLeading`,
+plus `…GreaterThanOrEqualTo` / `…LessThanOrEqualTo` variants.
+
+### `@discardableResult func setConstraintsTo(parentView: UIView, anchorType: AnchorType, value: CGFloat, safeArea: Bool = false) -> Self`
+Activate one constraint against `parentView`. Remembers `parentView` (in
+`viewReference`) so follow-up calls can omit it. `safeArea: true` pins top/bottom
+to the safe-area guide (iOS 11+).
+
+```swift
+card.addSubview(label)
+label.setConstraintsTo(parentView: card, anchorType: .top, value: 12, safeArea: false)
+     .setConstraints(.leading, 16)
+     .setConstraints(.trailing, -16)
+```
+
+### `@discardableResult func setConstraintsTo(_ parentView:_ anchorType:_ value:_ safeArea: Bool = false) -> Self`
+Positional-argument shorthand for the above.
+
+### `@discardableResult func setConstraintsTo(anchorType: AnchorType, value: CGFloat, safeArea: Bool = false) -> UIView`
+Reuse the last `parentView` (`viewReference`). **Traps** with `fatalError` if no
+`parentView` was set first.
+
+### `@discardableResult func setConstraints(_ anchorType: AnchorType, _ value: CGFloat, _ safeArea: Bool = false) -> UIView`
+Positional shorthand for the reuse form — the one you chain.
+
+### `func setConstraints(_ toScrollView: UIScrollView, direction: UICollectionView.ScrollDirection = .vertical)`
+Pin `self` as the single content view of a scroll view (edges + matching
+width/height, with a low-priority constraint on the scroll axis). Traps if
+`self` is itself a `UIScrollView`.
+
+```swift
+scrollView.addSubview(content)
+content.setConstraints(scrollView, direction: .vertical)
+```
+
+### Constraint accessors
+`widthConstraint`, `heightConstraint`, `leadingConstraint`, `trailingConstraint`,
+`topConstraint`, `bottomConstraint`, `centerXConstraints`, `centerYConstraints` —
+the first matching `NSLayoutConstraint` found by walking up the hierarchy.
+
+```swift
+box.widthConstraint?.constant = 120
+UIView.animate(withDuration: 0.2) { self.view.layoutIfNeeded() }
+```
+
+### `func findConstraint(attribute: NSLayoutConstraint.Attribute, for view: UIView) -> NSLayoutConstraint?`
+Search self and ancestors for a constraint on `attribute` involving `view`.
+
+### `func constraints(on anchor:) -> [NSLayoutConstraint]`
+Constraints touching a given `NSLayoutYAxisAnchor` / `XAxisAnchor` / `Dimension` of `self`.
+
+### `@discardableResult func setHeight(size:) -> Self` / `setHeight(min:)` / `setWidth(size:)` / `setWidth(min:)`
+Activate a fixed or minimum dimension constraint.
+
+```swift
+avatar.setWidth(size: 44).setHeight(size: 44)
+```
+
+### `func setWidth(_ toView: UIView? = nil, constant: CGFloat, _ multiplier: CGFloat = 0) -> Self` / `setHeight(...)`
+Dimension relative to another view (`multiplier`) or fixed (`multiplier == 0`).
+
+### Frame setters
+`setX(x:)`, `setY(y:)`, `setFrameWidth(width:)`, `setFrameHeight(height:)` — mutate
+`self.frame` directly (manual layout, not Auto Layout).
+
+</details>
+
+<details>
+<summary><b>UIView</b> — hierarchy, appearance, effects</summary>
+
+### `static var className: String`
+`String(describing: self)`.
+
+```swift
+UIButton.className   // "UIButton"
+```
+
+### `func addSubview(_ subview:, translatesAutoresizingMaskIntoConstraints: Bool = false)` / `addSubviews(_ subviews: [UIView], …)`
+Add a view (or many) and set `translatesAutoresizingMaskIntoConstraints` in one call.
+
+```swift
+view.addSubviews([header, body, footer])   // all ready for Auto Layout
+```
+
+### `func subviews<T>(ofType _: T.Type) -> [T]`
+All descendants of a type, recursively.
+
+```swift
+formView.subviews(ofType: UITextField.self)
+```
+
+### `func findAView<T>(_ ofType: T.Type) -> T?`
+First descendant of a type.
+
+### `var parentViewController: UIViewController?`
+Nearest owning view controller (walks the responder chain).
+
+### `var borderColor: UIColor?` / `var borderWidth: CGFloat` / `var cornerRadius: CGFloat`
+Layer border/corner shortcuts (`cornerRadius` also sets `masksToBounds`).
+
+```swift
+card.cornerRadius = 12
+card.borderWidth = 1
+card.borderColor = .separator
+```
+
+### `func setRadius(top: Bool, bottom: Bool, radius: CGFloat = 8)`
+Round only the top and/or bottom corners.
+
+```swift
+sheet.setRadius(top: true, bottom: false, radius: 16)
+```
+
+### `func applyShadow(color:offSet:radius:opacity:shouldRasterize: Bool = true, rasterizationScaleTo: = UIScreen.main.scale)` / `func removeShadow()`
+Layer shadow with rasterisation on by default.
+
+```swift
+card.applyShadow(color: .black, offSet: CGSize(width: 0, height: 2),
+                 radius: 6, opacity: 0.15)
+```
+
+### `func insertBlurView(style: UIBlurEffect.Style, color: UIColor = .black, alpha: CGFloat = 0.9)`
+Insert a full-bleed `UIVisualEffectView` behind the content.
+
+### `func drawCircle(inCoord x:y:with radius:strokeColor: = .red, fillColor: = .gray, isEmpty: Bool = false) -> [String: Any]`
+Add a circular `CAShapeLayer`; returns `["path": UIBezierPath, "layer": CAShapeLayer]`.
+
+### `var isRightToLeft: Bool`
+Effective RTL layout direction.
+
+### `var screenshot: UIImage?` / `func asImage() -> UIImage`
+Render the view to an image (`screenshot` via the legacy context, `asImage` via `UIGraphicsImageRenderer`).
+
+```swift
+let png = chartView.asImage().pngData()
+```
+
+### `var globalPoint: CGPoint?` / `var globalFrame: CGRect?` / `var absolutePosition: CGRect`
+Origin/frame converted to window coordinates.
+
+### `func fadeIn(withDuration: TimeInterval = 1, withDelay: TimeInterval = 0, completionHandler: @escaping (Bool) -> Void)` / `func fadeOut(...)`
+Animate `alpha` to 1 / 0. *(Completion-handler API — pre-dates async/await.)*
+
+```swift
+overlay.fadeOut { _ in overlay.removeFromSuperview() }
+```
+
+### `var viewReference: UIView?`
+Scratch reference used internally by the chained `setConstraintsTo` calls.
+
+</details>
+
+<details>
+<summary><b>GradientOrientation / EnumBorderSide</b></summary>
+
+### `enum GradientOrientation`
+`topRightBottomLeft`, `topLeftBottomRight`, `horizontal`, `vertical` — maps to a
+`CAGradientLayer` start/end point pair. Passed to gradient helpers elsewhere in
+the package.
+
+### `enum EnumBorderSide`
+`top`, `bottom`, `left`, `right` — which edge to draw a single-side border on.
+
+</details>
+
+<details>
+<summary><b>UIStackView</b> — convenience init, bulk arranged-subview ops (iOS 9+)</summary>
+
+### `convenience init(arrangedSubviews: [UIView]? = nil, axis: = .vertical, spacing: = 0, alignment: = .fill, distribution: = .fill, layoutMargins: = .zero, isMarginsRelative: Bool = true)`
+One-call configured stack view.
+
+```swift
+let stack = UIStackView(arrangedSubviews: [title, subtitle],
+                        axis: .vertical, spacing: 4)
+```
+
+### `func addArrangedSubviews(_ views: [UIView], translateAutoresizing: Bool = false)`
+Add many arranged subviews, setting their autoresizing flag.
+
+### `func removeAllArrangedSubviews(deactivateConstraints: Bool = true)`
+Remove and dispose every arranged subview.
+
+### `func removeSubview(view: UIView, deactivateConstraints: Bool = true)`
+Remove one arranged subview (optionally deactivating its constraints and removing from the hierarchy).
+
+### `func addSpace(_ size: CGFloat, backgroundColor: UIColor = .clear)`
+Insert a fixed-size spacer view sized along the stack's axis.
+
+```swift
+stack.addArrangedSubviews([row1, row2])
+stack.addSpace(24)
+stack.addArrangedSubview(row3)
+```
+
+</details>
+
+> `NSLayoutConstraint` helpers (`constraintWithMultiplier`, `matches(view:anchor:)`)
+> and `[NSLayoutConstraint].filtered(view:anchor:)` are `internal` — used by the
+> `UIView.constraints(on:)` accessors above, not called directly.
+
+## Views & Controls
+
+<details>
+<summary><b>UIButton</b> — per-state accessors, all-state setters</summary>
+
+### Per-state properties
+`imageForNormal` / `imageForHighlighted` / `imageForSelected` / `imageForDisabled`,
+`titleForNormal` / `…Highlighted` / `…Selected` / `…Disabled`,
+`titleColorForNormal` / `…Highlighted` / `…Selected` / `…Disabled` — get/set
+shortcuts for the matching `UIControl.State` (also `@IBInspectable`).
+
+```swift
+button.titleForNormal = "Save"
+button.titleColorForDisabled = .tertiaryLabel
+```
+
+### `func setTitleForAllStates(_:)` / `func setTitleColorForAllStates(_:)` / `func setImageForAllStates(_:)`
+Apply one value to `.normal`, `.selected`, `.highlighted`, `.disabled` at once.
+
+```swift
+button.setTitleColorForAllStates(.white)
+```
+
+### `func centerTextAndImage(spacing: CGFloat)`
+Balance title/image edge insets so text + icon sit centred with `spacing` between them.
+
+```swift
+button.centerTextAndImage(spacing: 8)
+```
+
+</details>
+
+<details>
+<summary><b>UILabel</b></summary>
+
+### `func lineNumbers() -> Int`
+Rendered line count at the current width.
+
+```swift
+if bodyLabel.lineNumbers() > 3 { showMoreButton() }
+```
+
+### `var getEstimatedHeight: CGFloat`
+Height the label would need to show its full text/attributed text unclipped.
+
+</details>
+
+<details>
+<summary><b>UITextField</b></summary>
+
+### `var placeholderColor: UIColor`
+Get/set the placeholder text colour (rebuilds `attributedPlaceholder`; setter is a
+no-op if no placeholder text is set).
+
+```swift
+field.placeholder = "Email"
+field.placeholderColor = .secondaryLabel
+```
+
+### `func addPaddingLeft(_ padding: CGFloat)`
+Inset the text from the left with an empty spacer view.
+
+### `func addPaddingLeftIcon(_ image: UIImage, padding: CGFloat)`
+Left view = an icon plus trailing padding.
+
+```swift
+field.addPaddingLeftIcon(UIImage(systemName: "magnifyingglass")!, padding: 8)
+```
+
+</details>
+
+<details>
+<summary><b>UIImageView</b> (<code>@MainActor</code>)</summary>
+
+### `func changeColorOfImage(_ color: UIColor, image: UIImage?) -> UIImageView`
+Set a template-rendered image tinted to `color`; returns `self`.
+
+```swift
+iconView.changeColorOfImage(.systemBlue, image: UIImage(named: "star"))
+```
+
+### `var encodeToBase64: String?`
+JPEG (quality 0.6) of the current image as a Base64 string.
+
+### `func addAspectRatioConstraint()` / `func removeAspectRatioConstraint()`
+Add / remove a width-to-height constraint matching the current image's ratio.
+
+```swift
+photoView.image = photo
+photoView.addAspectRatioConstraint()
+```
+
+</details>
+
+<details>
+<summary><b>UIImage</b> — recolour, resize, thumbnails, masks, init</summary>
+
+### `func imageWithColor(color: UIColor) -> UIImage` / `func tintImage(color: UIColor) -> UIImage`
+Return a copy filled / tinted with `color` (keeps the alpha shape).
+
+```swift
+let redIcon = icon.tintImage(color: .systemRed)
+```
+
+### `func backgroundColorTransparent(initialColor: UIColor, finalColor: UIColor) -> UIImage?`
+Make pixels in a colour range transparent.
+
+### `class func outlinedEllipse(size: CGSize, color: UIColor, lineWidth: CGFloat = 1) -> UIImage?`
+Generate a stroked-ellipse image.
+
+```swift
+UIImage.outlinedEllipse(size: CGSize(width: 24, height: 24), color: .label)
+```
+
+### `func resizeImage(newWidth: CGFloat) -> UIImage`
+Scale to `newWidth`, keeping the aspect ratio.
+
+### `func createThumbnail(_ maxPixelSize: UInt) -> UIImage`
+Fast down-sampled thumbnail via `CGImageSource`.
+
+```swift
+let thumb = fullImage.createThumbnail(200)
+```
+
+### `func maskWithAlphaImage(maskImage: UIImage) -> UIImage`
+Use another image's alpha as a mask.
+
+### `func isAnimated() -> Bool`
+Whether the image has more than one frame.
+
+### `init?(base64String: String, scale: CGFloat = 1)`
+Decode a Base64 string to an image.
+
+### `init(view: UIView)` — *`@MainActor`*
+Rasterise a view into an image.
+
+```swift
+let snapshot = UIImage(view: cardView)
+```
+
+</details>
+
+<details>
+<summary><b>UIColor</b> — hex, components</summary>
+
+### `convenience init(hex: String)`
+Parse `#RGB`, `#RGBA`, `#RRGGBB`, or `#RRGGBBAA` (with or without `#`).
+
+```swift
+view.backgroundColor = UIColor(hex: "#1E88E5")
+UIColor(hex: "FF0000CC")   // red at 80% alpha
+```
+
+### `var hexString: String?`
+`#RRGGBB` (or `#RRGGBBAA` when alpha < 1).
+
+### `var redValue` / `var greenValue` / `var blueValue` / `var alphaValue`
+Individual channel values (`CGFloat`, via `CIColor`).
+
+```swift
+UIColor.systemBlue.redValue   // 0.0…1.0
+```
+
+</details>
+
+<details>
+<summary><b>UIScrollView</b> — snapshot, visible rect, paged scrolling</summary>
+
+### `var snapshot: UIImage?`
+Image of the **entire** content size (not just the visible part) — works on
+`UITableView` / `UICollectionView` too.
+
+### `var visibleRect: CGRect`
+The currently visible content region.
+
+### `var offsetInPage: CGFloat`
+Fractional position within the current page height (`0.0`…`1.0`).
+
+### `func scrollUp(animated:)` / `scrollDown(animated:)` / `scrollLeft(animated:)` / `scrollRight(animated:)`
+Move one page (respects `isPagingEnabled`). `animated` defaults to `true`.
+
+```swift
+nextButton.onTap = { scrollView.scrollRight() }
+```
+
+### `enum orientation`
+`horizontal` / `vertical` — helper enum used by scroll utilities.
+
+</details>
+
+<details>
+<summary><b>UITapGestureRecognizer</b></summary>
+
+### `func didTapAttributedTextInLabel(label: UILabel, textToTouch: String) -> Bool`
+Whether the tap landed on a given substring of a label's attributed text — for
+making part of a label tappable.
+
+```swift
+@objc func handleTap(_ g: UITapGestureRecognizer) {
+    if g.didTapAttributedTextInLabel(label: termsLabel, textToTouch: "Terms of Use") {
+        openTerms()
+    }
+}
+```
+
+</details>
+
+## Navigation & Controllers
+
+<details>
+<summary><b>UINavigationController</b> — completion-handler push/pop, transparent bar</summary>
+
+### `func pushViewController(_:animated: Bool = true, completion: (() -> Void)? = nil)`
+### `func popViewController(animated: Bool = true, _ completion: (() -> Void)? = nil)`
+### `func popToViewController(_:animated: Bool = true, _ completion: (() -> Void)? = nil)`
+The standard transitions with a completion block (wrapped in a `CATransaction`).
+
+```swift
+navigationController?.pushViewController(detail) {
+    print("detail is on screen")
+}
+```
+
+### `func pushViewController(_:hidesBottomBar: Bool = false, animated: Bool = true)` — *not tvOS*
+Push while setting `hidesBottomBarWhenPushed`.
+
+### `func makeTransparent(withTint tint: UIColor = .white)`
+Clear background + shadow, translucent, tinted bar/title.
+
+```swift
+navigationController?.makeTransparent(withTint: .label)
+```
+
+</details>
+
+<details>
+<summary><b>UIViewController</b> — state, instantiation, dismissal, toasts, keyboard, observers</summary>
+
+### `var isVisible: Bool` / `var isLoaded: Bool`
+View is loaded **and** in a window. (`isLoaded` is an alias.)
+
+### `var isModal: Bool`
+Whether the controller is presented modally (vs. pushed).
+
+### `static var className: String` / `static var identifier: String` / `static var segueID: String`
+`"MyVC"`, `"idMyVC"`, `"idSegueMyVC"`.
+
+### `static func instantiate<T>(storyBoard: String, identifier: String? = nil, bundle: Bundle? = …) -> T`
+Load a controller from a storyboard by (default) `T.identifier`.
+
+```swift
+let vc: ProfileVC = ProfileVC.instantiate(storyBoard: "Main")
+```
+
+### `static func instatiate<T>(nibName: String, bundle: Bundle? = nil) -> T` *(sic — "instatiate")*
+Load from a nib and force an initial layout pass.
+
+### `func present(viewControllerToPresent:completion: @escaping () -> Void)`
+`present(_:animated:)` with a completion block.
+
+### `func closeController(jumpToController: UIViewController? = nil, completion: @escaping () -> Void)`
+Dismiss if modal, else pop (to `jumpToController` if given), then call `completion`.
+
+```swift
+closeController { self.refreshList() }
+```
+
+### `func show(toastWith message:, font: = system 12, toastPosition: ToastPosition, backgroundColor: = .black, textColor: = .white, duration: = 3)`
+Show a temporary rounded toast label. `ToastPosition` is `.top` / `.down`
+(notch-aware at the top).
+
+```swift
+show(toastWith: "Saved", toastPosition: .down)
+```
+
+### `func addNotificationObserver(name:selector:)` / `func removeNotificationObserver(name:)` / `func removeNotificationsObserver()`
+`NotificationCenter` registration shortcuts (last one removes all).
+
+### `@objc func dismissSystemKeyboard(_ sender: UITapGestureRecognizer)`
+Ready-made selector for a tap-to-dismiss-keyboard gesture.
+
+```swift
+view.addGestureRecognizer(UITapGestureRecognizer(target: self,
+    action: #selector(dismissSystemKeyboard(_:))))
+```
+
+</details>
+
+<details>
+<summary><b>UITabBarController</b> — badges, animated tab switching</summary>
+
+### `func setBadges(badgeValues: [Int], font: UIFont = Helvetica-Light 11)`
+Set numeric badges for every tab at once (`0` = no badge). Custom-drawn
+(`CustomTabBadge` label), so they position above each tab item.
+
+```swift
+tabBarController?.setBadges(badgeValues: [0, 3, 0, 12])
+```
+
+### `func addBadge(index:value:color:font:)`
+Add a single custom badge.
+
+### `func setSelectedView(atIndex:withAnimation: Bool = false, completion:)`
+Select a tab (pops that tab's nav stack to root first).
+
+### `func setSelectedView(withNoPop atIndex:withAnimation: Bool = false, completion:)`
+Same, without popping to root.
+
+### `func animateToTab(toIndex: Int)`
+Slide-transition between tabs.
+
+### `func changeViewControllerToItem(withViewController:Item:)`
+Replace a tab's root controller then switch to that tab.
+
+```swift
+tabBarController?.changeViewControllerToItem(withViewController: NewHome(), Item: 0)
+```
+
+### `class CustomTabBadge: UILabel`
+The badge label type used above (`init(font:)`).
+
+</details>
+
+<details>
+<summary><b>UIApplication</b> — environment, app info, open URL</summary>
+
+### `enum Environment` + `static var inferredEnvironment: Environment`
+`.debug` / `.testFlight` / `.appStore`, inferred from build config, simulator, and
+the provisioning/receipt files.
+
+```swift
+if UIApplication.inferredEnvironment == .appStore { enableAnalytics() }
+```
+
+### `static var displayName: String?` / `static var buildNumber: String?` / `static var version: String?`
+Bundle info values. (`LCEssentials.appVersion` etc. forward to these.)
+
+### `static func openURL(urlStr: String)`
+Open a URL string if it can be opened.
+
+```swift
+UIApplication.openURL(urlStr: "https://loverde.com.br")
+```
+
+</details>
+
+<details>
+<summary><b>UIResponder</b></summary>
+
+### `var getParentViewController: UIViewController?`
+Walk the responder chain to the owning view controller.
+
+```swift
+someView.getParentViewController?.present(alert, animated: true)
+```
+
+</details>
+
+<details>
+<summary><b>UIDevice</b> — notch metrics, model name</summary>
+
+### `static var topNotch: CGFloat` / `static var bottomNotch: CGFloat` / `static var hasNotch: Bool`
+Safe-area top/bottom insets and whether the device has a notch / Dynamic Island.
+
+```swift
+let headerY: CGFloat = UIDevice.hasNotch ? 44 : 20
+```
+
+### `var modelName: String`
+Marketing name from the hardware identifier (`"iPhone 15 Pro"`, `"iPad Air (5th generation)"`, …); falls back to the raw identifier for unknown devices. Reads `SIMULATOR_MODEL_IDENTIFIER` on the simulator.
+
+```swift
+UIDevice.current.modelName   // "iPhone 16 Pro"
+```
+
+</details>
+
+## Collections & Tables
+
+<details>
+<summary><b>UITableView</b> — typed dequeue, safe indexing, cell animations</summary>
+
+### `func dequeueReusableCell<T: UITableViewCell>(withClass name: T.Type) -> T` / `…(withClass:for indexPath:) -> T`
+Dequeue a cell by its class name as the identifier. **Traps** if the cell isn't registered.
+
+```swift
+let cell = tableView.dequeueReusableCell(withClass: OrderCell.self, for: indexPath)
+```
+
+### `func dequeueReusableHeaderFooterView<T: UITableViewHeaderFooterView>(withClass name: T.Type) -> T`
+Same, for section header/footer views.
+
+### `func dequeueCell<T: UITableViewCell>(indexPath: IndexPath) -> T`
+Dequeue using `T.identifier` (`"id" + class name`).
+
+### `func reloadData(_ completion: @escaping () -> Void)`
+`reloadData()` with a callback for when layout settles.
+
+### `func isValidIndexPath(_:) -> Bool`
+Bounds check against the current section/row counts.
+
+### `func safeScrollToRow(at:at scrollPosition:animated:)`
+`scrollToRow` that silently no-ops for an out-of-range index path.
+
+### `func makeMoveUpWithFadeAnimation(rowHeight:duration:delayFactor:) -> UITableViewCellAnimation`
+Build a staggered slide-up + fade-in cell animation closure.
+
+```swift
+let animator = UITableViewAnimator(
+    animation: tableView.makeMoveUpWithFadeAnimation(rowHeight: 64, duration: 0.35, delayFactor: 0.03)
+)
+
+func tableView(_ t: UITableView, willDisplay cell: UITableViewCell, forRowAt ip: IndexPath) {
+    animator.animate(cell: cell, at: ip, in: t)
+}
+```
+
+### `typealias UITableViewCellAnimation = (UITableViewCell, IndexPath, UITableView) -> Void`
+### `class UITableViewAnimator`
+`init(animation:)` + `animate(cell:at:in:)` — runs a cell animation closure.
+
+### `UITableViewCell.identifier` / `UITableViewCell.prepareDisclosureIndicator()`
+`"id" + class name`; and re-tint the disclosure chevron to a template image so it
+picks up `tintColor`.
+
+</details>
+
+<details>
+<summary><b>UICollectionView</b> — setup, counts, safe indexing, carousel layout</summary>
+
+### `static var identifier: String`
+`"id" + class name`.
+
+### `func setupCollectionView(flowLayout: = UICollectionViewFlowLayout(), spacings: = 0, direction: = .horizontal, edgesInset: = .zero, allowMulpleSelection: Bool = false, automaticSize: CGSize? = nil)`
+Configure layout spacing/direction/insets, multi-selection, and self-sizing in one call.
+
+```swift
+collectionView.setupCollectionView(spacings: 8, direction: .vertical,
+                                   edgesInset: .init(top: 12, left: 16, bottom: 12, right: 16))
+```
+
+### `func reloadData(_ completion: @escaping () -> Void)`
+Reload with a completion callback.
+
+### `func numberOfItems() -> Int`
+Total items across all sections.
+
+### `var lastSection: Int` / `var indexPathForLastItem: IndexPath?` / `func indexPathForLastItem(inSection:) -> IndexPath?`
+Last section index; index path of the last item overall or in a section.
+
+### `func isValidIndexPath(_:) -> Bool` / `func safeScrollToItem(at:at scrollPosition:animated:)`
+Bounds check; scroll that no-ops on an invalid index path.
+
+### `enum CollectionViewFlowLayoutSpacingMode`
+`.fixed(spacing:)` / `.overlap(visibleOffset:)` — spacing strategy for the carousel layout below.
+
+### `open class CollectionViewFlowLayout: UICollectionViewFlowLayout`
+A centred, paginated "cover-flow" style layout: the centred item is full size,
+side items scale and fade. Tunables: `sideItemScale` (0.6), `sideItemAlpha`
+(0.6), `sideItemShift` (0), `spacingMode` (`.fixed(40)`).
+
+```swift
+let layout = CollectionViewFlowLayout()
+layout.itemSize = CGSize(width: 240, height: 320)
+layout.sideItemScale = 0.7
+layout.spacingMode = .overlap(visibleOffset: 30)
+collectionView.collectionViewLayout = layout
+```
+
+</details>
+
+## Media & Components
+
+<details>
+<summary><b>LCSnackBarView</b> — in-app notification banner</summary>
+
+A chainable banner shown from the top or bottom of a controller. Configure with
+`configure(...)` calls, then `present()`.
+
+### `init(style: LCSnackBarViewType = .default, orientation: LCSnackBarOrientation = .top, delegate: LCSnackBarViewDelegate? = nil)`
+
+### Enums
+- `LCSnackBarViewType` — `.default` (rectangular) / `.rounded`
+- `LCSnackBarOrientation` — `.top` / `.bottom`
+- `LCSnackBarTimer: CGFloat` — `.infinity` (0, manual dismiss), `.minimum` (2s), `.medium` (5s), `.maximum` (10s)
+
+### Configuration (each returns `Self`)
+| Method | Sets |
+|---|---|
+| `configure(text: String)` | the message |
+| `configure(textColor: UIColor)` | text colour |
+| `configure(textFont: UIFont, alignment: NSTextAlignment = .center)` | font + alignment |
+| `configure(backgroundColor: UIColor)` | banner background |
+| `configure(exibition timer: LCSnackBarTimer)` | how long it stays |
+| `configure(imageIconBefore icon: UIImageView, withTintColor: UIColor? = nil)` | leading icon |
+
+### `func present(completion: (() -> Void)? = nil)`
+Show on the top-most view controller.
+
+### `weak var delegate: LCSnackBarViewDelegate?`
+`snackbar(didStartExibition:)`, `snackbar(didTouchOn:)`, `snackbar(didEndExibition:)` — all optional.
+
+### Full example
+
+```swift
+LCSnackBarView(style: .rounded, orientation: .bottom)
+    .configure(text: "Profile saved")
+    .configure(backgroundColor: .systemGreen)
+    .configure(exibition: .minimum)
+    .present()
+```
+
+</details>
+
+<details>
+<summary><b>ImagePickerController</b> — camera / photo-library picker with permissions</summary>
+
+Wraps `UIImagePickerController`, handling camera & photo-library authorization
+(including the "go to Settings" path) and presenting a source-choice alert.
+
+### `init()`
+### `weak var delegate: ImagePickerControllerDelegate?`
+### `var isEditable: Bool` — allow in-picker cropping (default `false`)
+### `func openImagePicker()`
+Check permissions, then present the camera/library choice.
+
+### `protocol ImagePickerControllerDelegate: AnyObject`
+`imagePicker(didSelect image: UIImage?)` — the picked (or edited) image, or `nil` on cancel/failure.
+
+```swift
+let picker = ImagePickerController()
+picker.delegate = self
+picker.isEditable = true
+present(picker, animated: false) { picker.openImagePicker() }
+
+// ImagePickerControllerDelegate
+func imagePicker(didSelect image: UIImage?) {
+    avatarView.image = image
+}
+```
+
+</details>
+
+<details>
+<summary><b>ImageZoomController</b> — full-screen pinch-zoom / pan viewer</summary>
+
+### `init(_ withImage: UIImage)`
+### `var minimumZoomScale: CGFloat` (default `1.0`) / `var maximumZoomScale: CGFloat` (default `6.0`)
+### `var addGestureToDismiss: Bool` (default `true`) — drag down to close
+### `weak var delegate: ImageZoomControllerDelegate?`
+### `func present(completion: (() -> Void)? = nil)` / `func dismiss(completion: (() -> Void)? = nil)`
+Present from / dismiss to the top-most controller.
+
+### `@objc protocol ImageZoomControllerDelegate`
+`imageZoomController(controller:didZoom:)`, `imageZoomController(controller:didClose:)` — both optional.
+
+```swift
+let viewer = ImageZoomController(photo)
+viewer.maximumZoomScale = 4
+viewer.present()
+```
+
+</details>
+
+<details>
+<summary><b>GifHelper</b> — animated GIF loading</summary>
+
+### `UIImageView.loadGif(name: String)` / `UIImageView.loadGif(asset: String)` *(iOS 9+)*
+Decode a bundled `.gif` (or an asset-catalog data set) off the main thread and
+assign the resulting animated `UIImage`.
+
+```swift
+bannerView.loadGif(name: "loading")        // loading.gif in the bundle
+bannerView.loadGif(asset: "confetti")      // NSDataAsset "confetti"
+```
+
+### `UIImage.gif(data: Data) -> UIImage?` / `gif(url: String) -> UIImage?` / `gif(name: String) -> UIImage?` / `gif(asset: String) -> UIImage?`
+Build an animated `UIImage` from GIF bytes / a URL string / a bundled file / an
+asset-catalog entry. Frame delays are honoured (via the GCD of per-frame delays).
+
+```swift
+let spinner = UIImage.gif(name: "spinner")
+imageView.image = spinner
+```
+
+</details>

README.md

@@ -1,85 +1,43 @@
-
 ![](loverde_company_logo_full.png)
-Loverde Co. Essentials Swift Scripts
-----
 
-This is a repository of essential scripts written in Swift for Loverde Co. used to save time on re-writing and keeping it on all other projects. So this Cocoapods will evolve with Swift and will improve with every release!
+# Loverde Co. Essentials
+
+Essential Swift scripts, extensions, SwiftUI components, and UIKit-era helpers,
+shared across Loverde Co. projects. Evolves with Swift, improves every release.
 
 ## Requirements
-- iOS 15.* or newer, Swift 5.* or newer.
 
-## Features
+- iOS 15 or newer · Swift 5 or newer
-- [x] Many usefull scripts extensions
-- [x] `API` — typed async networking + multipart uploads. See **[Documentation/API.md](Documentation/API.md)**
 
+## Installation — Swift Package Manager
 
-Installation
-----
-#### Swift Package  Manager (SPM)
 ```swift
 dependencies: [
-    .package(url: "https://git.loverde.com.br/Loverde-Company-LTDA/LCEssentials", .upToNextMajor(from: "1.0.0"))
+    .package(url: "https://git.loverde.com.br/Loverde-Company-LTDA/LCEssentials", .upToNextMajor(from: "2.0.0"))
 ]
 ```
 
-You can also add it via XCode SPM editor with URL: 
+Or add it in Xcode via **File ▸ Add Package Dependencies…** with the URL:
 
-``` swift
+```
 https://git.loverde.com.br/Loverde-Company-LTDA/LCEssentials
 ```
 
-## Usage example
-
-* Background Trhead  
-
-```swift
-LCEssentials.backgroundThread(delay: 0.6, background: {
-            //Do something im background
-        }) {
-            //When finish, update UI
-        }
-```
-* NavigationController with Completion Handler  
-
-```swift
-self.navigationController?.popViewControllerWithHandler(completion: {
-            //Do some stuff after pop
-        })
-        
-//or more simple
-self.navigationController?.popViewControllerWithHandler {
-    //Do some stuff after pop
-}
-```
-* Networking with `API`
-
-```swift
-struct User: Decodable, Sendable { let id: Int; let name: String }
-
-let user: User = try await API.shared.request(
-    url: "https://api.example.com/users/{id}",
-    method: .get,
-    pathParams: ["id": "42"]
-)
-```
-
-Full guide — requests, uploads, client certificates, error handling, and why it
-beats a hand-rolled `URLSession`: **[Documentation/API.md](Documentation/API.md)**
-
-## Another components
-> LCESnackBarView - **great way to send feedback to user**
-
-And then import `LCEssentials ` wherever you import UIKit or SwiftUI
-
 ```swift
 import LCEssentials
 ```
 
-Any question or doubts, please send thru email
+## Documentation
 
-Daniel Arantes Loverde - <daniel@loverde.com.br>
+| Guide | Covers |
+| --- | --- |
+| **[API.md](Documentation/API.md)** | `API` networking — typed requests, multipart uploads, client certificates, error handling, and why it beats a hand-rolled `URLSession` |
+| **[Extensions.md](Documentation/Extensions.md)** | Foundation / value-type / string / collection / numeric / date / crypto extensions and the `LCEssentials` namespace |
+| **[SwiftUI.md](Documentation/SwiftUI.md)** | SwiftUI components (`LCENavigationView`) and `View` helpers |
+| **[UIKit.md](Documentation/UIKit.md)** | Programmatic layout & constraints, view/control extensions, navigation, tables, and drop-in components (`LCSnackBarView`, image picker/zoom, GIF loading) |
 
-[![Alt text](https://loverde.com.br/_signature/loverde_github_mail.gif "My Resume")](https://github.com/loverde-co/resume/)
+---
-[![Alt text](https://loverde.com.br/_signature/loverde_github_mail.gif "Loverde Co. Github")](https://github.com/loverde-co)
 
-Autor: Daniel Arantes Loverde
+Daniel Arantes Loverde — <daniel@loverde.com.br>
+
+[<img src="https://github.githubassets.com/images/modules/logos_page/GitHub-Mark.png" width="28" alt="GitHub">](https://github.com/loverde-co/resume/)

Sources/LCEssentials/SwiftUI/LCENavigationView.swift

@@ -49,6 +49,39 @@ class LCENavigationState: ObservableObject {
     @Published var subTitle: (any View) = Text("")
     /// The background color of the navigation bar.
     @Published var navigationBarBackgroundColor: Color = .clear
+
+    /// Whether a left button was actually configured via `setLeftButton`.
+    @Published var hasLeftButton: Bool = false
+    /// Whether a right button was actually configured via `setRightButton`.
+    @Published var hasRightButton: Bool = false
+    /// Whether buttons should opt into the system Liquid Glass button style (iOS 26+). Off by default.
+    @Published var useGlassButtons: Bool = false
+}
+
+/// `PreferenceKey` used to measure the widest side button so the title can be padded symmetrically and stay centered without overlapping either button.
+@available(iOS 15, *)
+private struct LCENavButtonWidthPreferenceKey: PreferenceKey {
+    static var defaultValue: CGFloat { 0 }
+    static func reduce(value: inout CGFloat, nextValue: () -> CGFloat) {
+        value = max(value, nextValue())
+    }
+}
+
+@available(iOS 15, *)
+private extension View {
+    /// Applies `.glass` button style on iOS 26+ when enabled, otherwise falls back to `.plain` — the navigation bar is not designed around glass, but stays opt-in ready.
+    @ViewBuilder
+    func lce_applyGlassIfEnabled(_ enabled: Bool) -> some View {
+        if enabled {
+            if #available(iOS 26.0, *) {
+                self.buttonStyle(.glass)
+            } else {
+                self.buttonStyle(.plain)
+            }
+        } else {
+            self.buttonStyle(.plain)
+        }
+    }
 }
 
 /// `LCENavigationView` is a SwiftUI `View` that provides a customizable navigation bar.
@@ -61,6 +94,9 @@ public struct LCENavigationView<Content: View>: View {
     /// The content view displayed below the navigation bar.
     let content: Content
 
+    /// The measured width of the widest side button, used to pad the title so it never overlaps either button.
+    @State private var maxButtonWidth: CGFloat = 0
+
     /// Initializes a new `LCENavigationView` instance.
     /// - Parameters:
     ///   - title: The title view for the navigation bar. Defaults to an empty `Text`.
@@ -92,18 +128,29 @@ public struct LCENavigationView<Content: View>: View {
 
     /// The private `NavigationBarView` that lays out the navigation bar components.
     private var NavigationBarView: some View {
-        HStack {
+        ZStack {
-            NavLeftButton
-            Spacer()
             TitleView
+                .padding(.horizontal, maxButtonWidth)
+                .lineLimit(1)
+                .minimumScaleFactor(0.7)
+                .frame(maxWidth: .infinity)
+
+            HStack {
+                if state.hasLeftButton {
+                    NavLeftButton
+                }
                 Spacer()
+                if state.hasRightButton {
                     NavRightButton
                 }
+            }
+        }
         .font(.headline)
         .padding()
         .background {
             state.navigationBarBackgroundColor.ignoresSafeArea(edges: .top)
         }
+        .onPreferenceChange(LCENavButtonWidthPreferenceKey.self) { maxButtonWidth = $0 }
     }
 
     /// The private `TitleView` that displays the title and subtitle.
@@ -116,7 +163,7 @@ public struct LCENavigationView<Content: View>: View {
         }
     }
 
-    /// The private `NavLeftButton` view.
+    /// The private `NavLeftButton` view. Only rendered when `setLeftButton` was actually called — never a hidden placeholder.
     private var NavLeftButton: some View {
         Button(action: state.leftButtonAction) {
             HStack {
@@ -126,9 +173,15 @@ public struct LCENavigationView<Content: View>: View {
                 state.leftButtonText
             }
         }
+        .lce_applyGlassIfEnabled(state.useGlassButtons)
+        .background(
+            GeometryReader { proxy in
+                Color.clear.preference(key: LCENavButtonWidthPreferenceKey.self, value: proxy.size.width)
+            }
+        )
     }
 
-    /// The private `NavRightButton` view.
+    /// The private `NavRightButton` view. Only rendered when `setRightButton` was actually called — never a hidden placeholder.
     private var NavRightButton: some View {
         Button(action: state.rightButtonAction) {
             HStack {
@@ -138,6 +191,12 @@ public struct LCENavigationView<Content: View>: View {
                 }
             }
         }
+        .lce_applyGlassIfEnabled(state.useGlassButtons)
+        .background(
+            GeometryReader { proxy in
+                Color.clear.preference(key: LCENavButtonWidthPreferenceKey.self, value: proxy.size.width)
+            }
+        )
     }
     
     /// Sets the configuration for the right button of the navigation bar.
@@ -158,13 +217,7 @@ public struct LCENavigationView<Content: View>: View {
         }
         state.rightButtonText = text
         state.rightButtonAction = action
-        
+        state.hasRightButton = true
-        if let string = state.leftButtonText.string, string.isEmpty {
-            state.leftButtonText = text.foregroundColor(.clear)
-        }
-        if state.leftButtonImage == nil {
-            state.leftButtonImage = image?.foregroundColor(.clear) as? AnyView
-        }
 
         return self
     }
@@ -187,14 +240,17 @@ public struct LCENavigationView<Content: View>: View {
         }
         state.leftButtonText = text
         state.leftButtonAction = action
+        state.hasLeftButton = true
 
-        if let string = state.rightButtonText.string, string.isEmpty {
+        return self
-            state.rightButtonText = text.foregroundColor(.clear)
-        }
-        if state.rightButtonImage == nil {
-            state.rightButtonImage = image?.foregroundColor(.clear) as? AnyView
     }
 
+    /// Opts the navigation bar's buttons into the system Liquid Glass `.glass` button style on iOS 26+.
+    /// The navigation bar is designed as a plain, non-glass component by default; call this to enable glass explicitly.
+    /// - Parameter enabled: Whether buttons should use the glass style.
+    /// - Returns: The `LCENavigationView` instance for chaining.
+    public func setGlassButtonsEnabled(_ enabled: Bool) -> LCENavigationView {
+        state.useGlassButtons = enabled
         return self
     }
     
@@ -229,101 +285,6 @@ public struct LCENavigationView<Content: View>: View {
     }
 }
 
-/// Extension to `FormatStyle` to format any value as a string.
-@available(iOS 15.0, *)
-extension FormatStyle {
-    /// Formats an input value if it matches the `FormatInput` type.
-    /// - Parameter value: The value to format as `Any`.
-    /// - Returns: The formatted output, or `nil` if the value type does not match.
-    func format(any value: Any) -> FormatOutput? {
-        if let v = value as? FormatInput {
-            return format(v)
-        }
-        return nil
-    }
-}
-
-/// Extension to `LocalizedStringKey` to resolve localized strings.
-@available(iOS 15.0, *)
-extension LocalizedStringKey {
-    /// Resolves the localized string key into a `String`.
-    /// - Returns: The resolved string, or `nil` if resolution fails.
-    var resolved: String? {
-        let mirror = Mirror(reflecting: self)
-        guard let key = mirror.descendant("key") as? String else {
-            return nil
-        }
-
-        guard let args = mirror.descendant("arguments") as? [Any] else {
-            return nil
-        }
-
-        let values = args.map { arg -> Any? in
-            let mirror = Mirror(reflecting: arg)
-            if let value = mirror.descendant("storage", "value", ".0") {
-                return value
-            }
-
-            guard let format = mirror.descendant("storage", "formatStyleValue", "format") as? any FormatStyle,
-                  let input = mirror.descendant("storage", "formatStyleValue", "input") else {
-                return nil
-            }
-
-            return format.format(any: input)
-        }
-
-        let va = values.compactMap { arg -> CVarArg? in
-            switch arg {
-            case let i as Int:      return i
-            case let i as Int64:    return i
-            case let i as Int8:     return i
-            case let i as Int16:    return i
-            case let i as Int32:    return i
-            case let u as UInt:     return u
-            case let u as UInt64:   return u
-            case let u as UInt8:    return u
-            case let u as UInt16:   return u
-            case let u as UInt32:   return u
-            case let f as Float:    return f
-            case let f as CGFloat:  return f
-            case let d as Double:   return d
-            case let o as NSObject: return o
-            default:                return nil
-            }
-        }
-
-        if va.count != values.count {
-            return nil
-        }
-
-        return String.localizedStringWithFormat(key, va)
-    }
-}
-
-/// Extension to `Text` to retrieve its string content.
-@available(iOS 15.0, *)
-extension Text {
-    /// Returns the string representation of the `Text` view.
-    /// - Returns: The string content, or `nil` if it cannot be extracted.
-    var string: String? {
-        let mirror = Mirror(reflecting: self)
-        if let s = mirror.descendant("storage", "verbatim") as? String {
-            return s
-        } else if let attrStr = mirror.descendant("storage", "anyTextStorage", "str") as? AttributedString {
-            return String(attrStr.characters)
-        } else if let key = mirror.descendant("storage", "anyTextStorage", "key") as? LocalizedStringKey {
-            return key.resolved
-        } else if let format = mirror.descendant("storage", "anyTextStorage", "storage", "format") as? any FormatStyle,
-                  let input = mirror.descendant("storage", "anyTextStorage", "storage", "input") {
-            return format.format(any: input) as? String
-        } else if let formatter = mirror.descendant("storage", "anyTextStorage", "formatter") as? Formatter,
-                  let object = mirror.descendant("storage", "anyTextStorage", "object") {
-            return formatter.string(for: object)
-        }
-        return nil
-    }
-}
-
 //@available(iOS 15.0, *)
 //struct LCENavigationView_Previews: PreviewProvider {
 //    static var previews: some View {