added presentationDragIndicatorVisibility modifier

Author: MiaKoring

Examples/Sources/WindowingExample/WindowingApp.swift

@@ -83,8 +83,8 @@ struct SheetDemo: View {
             print("sheet dismissed")
         } content: {
             SheetBody()
-                .frame(maxWidth: 200, maxHeight: 100)
                 .presentationDetents([.height(150), .medium, .large])
+                .presentationDragIndicatorVisibility(.visible)
         }
         .sheet(isPresented: $isShortTermSheetPresented) {
             Text("I'm only here for 5s")

Sources/SwiftCrossUI/Backend/AppBackend.swift

@@ -654,6 +654,9 @@ public protocol AppBackend: Sendable {
     ///   - detents: An array of detents that the sheet can be resized to.
     func setPresentationDetents(of sheet: Sheet, to detents: [PresentationDetent])
 
+    func setPresentationDragIndicatorVisibility(
+        of sheet: Sheet, to visibility: PresentationDragIndicatorVisibility)
+
     /// Presents an 'Open file' dialog to the user for selecting files or
     /// folders.
     ///
@@ -1254,4 +1257,10 @@ extension AppBackend {
     public func setPresentationDetents(of sheet: Sheet, to detents: [PresentationDetent]) {
         ignored()
     }
+
+    public func setPresentationDragIndicatorVisibility(
+        of sheet: Sheet, to visibility: PresentationDragIndicatorVisibility
+    ) {
+        ignored()
+    }
 }

Sources/SwiftCrossUI/Values/PresentationDragIndicatorVisibility.swift

@@ -0,0 +1,3 @@
+public enum PresentationDragIndicatorVisibility {
+    case hidden, visible
+}

Sources/SwiftCrossUI/ViewGraph/PreferenceValues.swift

@@ -15,10 +15,13 @@ public struct PreferenceValues: Sendable {
     /// The corner radius for a sheet presentation. Only applies to the top-level view in a sheet.
     public var presentationCornerRadius: Double?
 
+    public var presentationDragIndicatorVisibility: PresentationDragIndicatorVisibility?
+
     public init(
         onOpenURL: (@Sendable @MainActor (URL) -> Void)?,
         presentationDetents: [PresentationDetent]? = nil,
-        presentationCornerRadius: Double? = nil
+        presentationCornerRadius: Double? = nil,
+        presentationDragIndicatorVisibility: PresentationDragIndicatorVisibility? = nil
     ) {
         self.onOpenURL = onOpenURL
         self.presentationDetents = presentationDetents
@@ -40,5 +43,6 @@ public struct PreferenceValues: Sendable {
         // This ensures only the root view's presentation modifiers apply to the sheet
         presentationDetents = children.first?.presentationDetents
         presentationCornerRadius = children.first?.presentationCornerRadius
+        presentationDragIndicatorVisibility = children.first?.presentationDragIndicatorVisibility
     }
 }

Sources/SwiftCrossUI/Views/Modifiers/SheetModifier.swift

@@ -71,8 +71,6 @@ struct SheetModifier<Content: View, SheetContent: View>: TypeSafeView {
         )
 
         if isPresented.wrappedValue && children.sheet == nil {
-            //let sheetSize = dryRunResult.size.idealSize
-
             let sheet = backend.createSheet()
 
             let dryRunResult = children.sheetContentNode.update(
@@ -106,6 +104,13 @@ struct SheetModifier<Content: View, SheetContent: View>: TypeSafeView {
                 backend.setPresentationDetents(of: sheet, to: detents)
             }
 
+            if let presentationDragIndicatorVisibility = preferences
+                .presentationDragIndicatorVisibility
+            {
+                backend.setPresentationDragIndicatorVisibility(
+                    of: sheet, to: presentationDragIndicatorVisibility)
+            }
+
             backend.showSheet(
                 sheet,
                 window: .some(environment.window! as! Backend.Window)

Sources/SwiftCrossUI/Views/Modifiers/Style/PresentationCornerRadiusModifier.swift

@@ -0,0 +1,37 @@
+extension View {
+    /// Sets the available detents (heights) for a sheet presentation.
+    ///
+    /// This modifier only affects the sheet presentation itself when applied to the
+    /// top-level view within a sheet. It allows users to resize the sheet to different
+    /// predefined heights.
+    ///
+    /// supported platforms: iOS (ignored on unsupported platforms)
+    /// ignored on: older than iOS 15
+    /// fraction and height fall back to medium on iOS 15 and work as you'd expect on >=16
+    ///
+    /// - Parameter detents: A set of detents that the sheet can be resized to.
+    /// - Returns: A view with the presentation detents preference set.
+    public func presentationDetents(_ detents: Set<PresentationDetent>) -> some View {
+        preference(key: \.presentationDetents, value: Array(detents))
+    }
+
+    /// Sets the corner radius for a sheet presentation.
+    ///
+    /// This modifier only affects the sheet presentation itself when applied to the
+    /// top-level view within a sheet. It does not affect the content's corner radius.
+    ///
+    /// supported platforms: iOS (ignored on unsupported platforms)
+    /// ignored on: older than iOS 15
+    ///
+    /// - Parameter radius: The corner radius in pixels.
+    /// - Returns: A view with the presentation corner radius preference set.
+    public func presentationCornerRadius(_ radius: Double) -> some View {
+        preference(key: \.presentationCornerRadius, value: radius)
+    }
+
+    public func presentationDragIndicatorVisibility(
+        _ visibility: PresentationDragIndicatorVisibility
+    ) -> some View {
+        preference(key: \.presentationDragIndicatorVisibility, value: visibility)
+    }
+}

Sources/SwiftCrossUI/Views/Modifiers/Style/PresentationDetentsModifier.swift

@@ -81,6 +81,22 @@ extension UIKitBackend {
             #endif
         }
     }
+
+    public func setPresentationDragIndicatorVisibility(
+        of sheet: Sheet, to visibility: PresentationDragIndicatorVisibility
+    ) {
+        if #available(iOS 15.0, *) {
+            if let sheetController = sheet.sheetPresentationController {
+                sheetController.prefersGrabberVisible = visibility == .visible ? true : false
+            }
+        } else {
+            #if DEBUG
+                print(
+                    "Your current OS Version doesn't support setting sheet drag indicator visibility.\n Setting this is only available from iOS 15.0"
+                )
+            #endif
+        }
+    }
 }
 
 public final class CustomSheet: UIViewController, SheetImplementation {