feat: Rotation.

Sources/CropImage/CropImageView.swift

@@ -12,6 +12,13 @@ import UIKit
 
 /// A view that allows the user to crop an image.
 public struct CropImageView<Controls: View>: View {
+    public typealias ControlClosure<Controls> = (
+        _ offset: Binding<CGSize>,
+        _ scale: Binding<CGFloat>,
+        _ rotation: Binding<Angle>,
+        _ crop: @escaping () async -> ()
+    ) -> Controls
+
     /// Errors that could happen during the cropping process.
     public enum CropError: Error {
         /// SwiftUI `ImageRenderer` returned nil when calling `nsImage` or `uiImage`.
@@ -28,29 +35,6 @@ public struct CropImageView<Controls: View>: View {
         case failedToGetImageFromCurrentUIGraphicsImageContext
     }
 
-    private static func defaultControlsView(crop: @escaping () async -> ()) -> AnyView { AnyView(
-        VStack {
-            Spacer()
-            HStack {
-                Spacer()
-                Button { Task {
-                    await crop()
-                } } label: {
-                    Label("Crop", systemImage: "checkmark.circle.fill")
-                        .font(.title2)
-                        .foregroundColor(.accentColor)
-                        .labelStyle(.iconOnly)
-                        .padding(1)
-                        .background(
-                            Circle().fill(.white)
-                        )
-                }
-                .buttonStyle(.plain)
-                .padding()
-            }
-        }
-    ) }
-
     /// The image to crop.
     public var image: PlatformImage
     /// The intended size of the cropped image, in points.
@@ -67,7 +51,7 @@ public struct CropImageView<Controls: View>: View {
     ///
     /// - Parameters:
     ///   - crop: An async function to trigger crop action. Result will be delivered via ``onCrop``.
-    public var controls: (_ crop: @escaping () async -> ()) -> Controls
+    public var controls: ControlClosure<Controls>
 
     /// Create a ``CropImageView`` with a custom ``controls`` view.
     public init(
@@ -75,7 +59,7 @@ public struct CropImageView<Controls: View>: View {
         targetSize: CGSize,
         targetScale: CGFloat = 1,
         onCrop: @escaping (Result<PlatformImage, Error>) -> Void,
-        @ViewBuilder controls: @escaping (_ crop: () async -> ()) -> Controls
+        @ViewBuilder controls: @escaping ControlClosure<Controls>
     ) {
         self.image = image
         self.targetSize = targetSize
@@ -91,21 +75,29 @@ public struct CropImageView<Controls: View>: View {
         targetSize: CGSize,
         targetScale: CGFloat = 1,
         onCrop: @escaping (Result<PlatformImage, Error>) -> Void
-    ) where Controls == AnyView {
+    ) where Controls == DefaultControlsView {
         self.image = image
         self.targetSize = targetSize
         self.targetScale = targetScale
         self.onCrop = onCrop
-        self.controls = Self.defaultControlsView
+        self.controls = { $offset, $scale, $rotation, crop in
+            DefaultControlsView(offset: $offset, scale: $scale, rotation: $rotation, crop: crop)
+        }
     }
 
     @State private var offset: CGSize = .zero
     @State private var scale: CGFloat = 1
+    @State private var rotation: Angle = .zero
 
     @MainActor
     func crop() throws -> PlatformImage {
-        let snapshotView = MoveAndScalableImageView(offset: $offset, scale: $scale, image: image)
-            .frame(width: targetSize.width, height: targetSize.height)
+        let snapshotView = UnderlyingImageView(
+            offset: $offset,
+            scale: $scale,
+            rotation: $rotation,
+            image: image
+        )
+        .frame(width: targetSize.width, height: targetSize.height)
         if #available(iOS 16.0, macOS 13.0, *) {
             let renderer = ImageRenderer(content: snapshotView)
             renderer.scale = targetScale
@@ -147,13 +139,18 @@ public struct CropImageView<Controls: View>: View {
 
     public var body: some View {
         ZStack {
-            MoveAndScalableImageView(offset: $offset, scale: $scale, image: image)
+            UnderlyingImageView(
+                offset: $offset,
+                scale: $scale,
+                rotation: $rotation,
+                image: image
+            )
             RectHoleShape(size: targetSize)
                 .fill(style: FillStyle(eoFill: true))
                 .foregroundColor(.black.opacity(0.6))
                 .animation(.default, value: targetSize)
                 .allowsHitTesting(false)
-            controls {
+            controls($offset, $scale, $rotation) {
                 do {
                     onCrop(.success(try crop()))
                 } catch {

Sources/CropImage/DefaultControlsView.swift

@@ -0,0 +1,70 @@
+//
+//  DefaultControlsView.swift
+//
+//
+//  Created by Shibo Lyu on 2023/8/10.
+//
+
+import SwiftUI
+
+/// The default controls view used when creating ``CropImageView`` using ``CropImageView/init(image:targetSize:targetScale:onCrop:)``.
+///
+/// It provides basic controls to crop, reset to default cropping & rotation, and rotate the image.
+public struct DefaultControlsView: View {
+    @Binding var offset: CGSize
+    @Binding var scale: CGFloat
+    @Binding var rotation: Angle
+    var crop: () async -> Void
+
+    public var body: some View {
+        VStack {
+            Spacer()
+            HStack {
+                Button {
+                    let roundedAngle = Angle.degrees((rotation.degrees / 90).rounded() * 90)
+                    withAnimation {
+                        rotation = roundedAngle + .degrees(90)
+                    }
+                } label: {
+                    Label("Rotate", systemImage: "rotate.right")
+                        .font(.title2)
+                        .foregroundColor(.accentColor)
+                        .labelStyle(.iconOnly)
+                        .padding(.horizontal, 6)
+                        .padding(.vertical, 3)
+                        .background(
+                            RoundedRectangle(cornerRadius: 5, style: .continuous)
+                                .fill(.white)
+                        )
+                }
+                .buttonStyle(.plain)
+                .padding()
+                Spacer()
+                Button("Reset") {
+                    withAnimation {
+                        offset = .zero
+                        scale = 1
+                        rotation = .zero
+                    }
+                }
+                .buttonStyle(.bordered)
+                .buttonBorderShape(.roundedRectangle)
+                Spacer()
+                Button { Task {
+                    await crop()
+                } } label: {
+                    Label("Crop", systemImage: "checkmark.circle.fill")
+                        .font(.title2)
+                        .foregroundColor(.accentColor)
+                        .labelStyle(.iconOnly)
+                        .padding(1)
+                        .background(
+                            Circle().fill(.white)
+                        )
+                }
+                .buttonStyle(.plain)
+                .padding()
+            }
+        }
+    }
+}

Sources/CropImage/UnderlyingImageView.swift

@@ -1,5 +1,5 @@
 //
-//  MoveAndScalableImageView.swift
+//  UnderlyingImageView.swift
 //
 //
 //  Created by Shibo Lyu on 2023/7/21.
@@ -13,25 +13,30 @@ private extension CGSize {
     }
 }
 
-struct MoveAndScalableImageView: View {
+struct UnderlyingImageView: View {
     @Binding var offset: CGSize
     @Binding var scale: CGFloat
+    @Binding var rotation: Angle
     var image: PlatformImage
 
     @State private var tempOffset: CGSize = .zero
     @State private var tempScale: CGFloat = 1
+    @State private var tempRotation: Angle = .zero
+
+    var imageView: Image {
+#if os(macOS)
+        Image(nsImage: image)
+#elseif os(iOS)
+        Image(uiImage: image)
+#endif
+    }
 
     var body: some View {
         ZStack {
-            #if os(macOS)
-            Image(nsImage: image)
+            imageView
                 .scaleEffect(scale * tempScale)
                 .offset(offset + tempOffset)
-            #elseif os(iOS)
-            Image(uiImage: image)
-                .scaleEffect(scale * tempScale)
-                .offset(offset + tempOffset)
-            #endif
+                .rotationEffect(rotation + tempRotation)
             Color.white.opacity(0.0001)
                 .gesture(
                     DragGesture()
@@ -46,13 +51,23 @@ struct MoveAndScalableImageView: View {
                 .gesture(
                     MagnificationGesture()
                         .onChanged { value in
-                            tempScale = value.magnitude
+                            tempScale = value
                         }
                         .onEnded { value in
                             scale = scale * tempScale
                             tempScale = 1
                         }
                 )
+                .gesture(
+                    RotationGesture()
+                        .onChanged { value in
+                            tempRotation = value
+                        }
+                        .onEnded { value in
+                            rotation = rotation + tempRotation
+                            tempRotation = .zero
+                        }
+                )
         }
     }
 }
@@ -61,9 +76,15 @@ struct MoveAndScalableImageView_Previews: PreviewProvider {
     struct PreviewView: View {
         @State private var offset: CGSize = .zero
         @State private var scale: CGFloat = 1
+        @State private var rotation: Angle = .zero
 
         var body: some View {
-            MoveAndScalableImageView(offset: $offset, scale: $scale, image: .init(contentsOfFile: "/Users/laosb/Downloads/png.png")!)
+            UnderlyingImageView(
+                offset: $offset,
+                scale: $scale,
+                rotation: $rotation,
+                image: .init(contentsOfFile: "/Users/laosb/Downloads/png.png")!
+            )
         }
     }