为每个 Action Sheet 按钮添加不同的修饰符

Question

这可能是个很简单的问题，但我找不到答案。

我正在尝试构建一个带有两个按钮（以及一个取消按钮）的 ActionSheet：

按钮“来自图库的Select”打开 imagePicker，其中 sourceType 设置为 .photoLibrary。
“拍一张新照片”按钮会打开 imagePicker，其中 sourceType 设置为 .camera。

我已经成功制作了 ActionSheet 和 imagePicker，但无法确定在何处添加修饰符以告知每个按钮应使用哪个 sourceType。我设法将它添加到 ActionSheet 之外的 sheet() 修饰符中，像这样的普通按钮中并且一切正常：

Button(action: {
                            self.show.toggle()
                        })
                        {Text("Take a new picture")}
                        .sheet(isPresented: self.$show, content: {
                            ImagePicker(sourceType: .camera, show: self.$show, image: self.$imageTemp)
                        })

但是我看不到将此信息包含在 ActionSheet 中的什么位置。非常感谢任何能提供帮助的人，我希望这很清楚:-)

这是我的代码：

struct ContentView: View {

@State private var showingActionSheet = false
@State var imageTemp : Data = (UIImage(systemName: "photo.on.rectangle.angled")?.jpegData(compressionQuality: 1))!

var body: some View {
        NavigationView {
Image(uiImage: UIImage(data: imageTemp)!)
                        .onTapGesture {
                                        self.showingActionSheet = true
                                    }
                        .actionSheet(isPresented: $showingActionSheet) {
                            ActionSheet(title: Text("Image selector"), message: Text("Select an image"), buttons: [
                                .default(Text("Select from Gallery"))
                                    {
                                        self.show.toggle()
                                    },
                                .default(Text("Take new picture")) {
                                    self.show.toggle()
                                },
                                .cancel()
                            ]
                            )
                        }
                 }
         }
}

并且，以防万一，这是我的 imagePicker 的代码，尽管我认为它可能没有必要。

struct ImagePicker: UIViewControllerRepresentable {
    var sourceType: UIImagePickerController.SourceType = .photoLibrary
    
    @Binding var show: Bool
    @Binding var image: Data
    
    func makeCoordinator() -> ImagePicker.Coordinator {
        let imagePicker = UIImagePickerController()
        return ImagePicker.Coordinator(child1: self)
    }
    
    func makeUIViewController(context: UIViewControllerRepresentableContext<ImagePicker>) -> UIImagePickerController {
        let picker = UIImagePickerController()
        picker.delegate = context.coordinator
        picker.sourceType = sourceType
        return picker
    }

    func updateUIViewController(_ uiViewController: UIImagePickerController, context: UIViewControllerRepresentableContext<ImagePicker>) {

    }
    
    class Coordinator: NSObject, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
        var child : ImagePicker
        init(child1: ImagePicker) {
            child = child1
        }
    
    
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        self.child.show.toggle()
    }
    
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any]) {
        let image = info[.originalImage]as! UIImage
        let data = image.jpegData(compressionQuality: 0.45)
        self.child.image = data!
        self.child.show.toggle()
    }
}
}

Answer 1

您的问题几乎可以归结为“我如何呈现多个 sheet？”，因此可能会有所帮助。

定义一个新的 enum 以包含可能的 sheet 类型（gallery/take 照片）
声明一个 @State 属性来保存当前的 sheet 类型。它是可选的，因为当它为 nil 时，将不会显示 sheet。
将属性设置为您想要的类型
使用sheet(item:onDismiss:content:) instead of sheet(isPresented:onDismiss:content:)。 isPresented 最适合静态 sheets。 item 适用于当您有多个 sheet 类型时，这就是您想要的。

enum PhotoSheetType: Identifiable { /// 1.
    var id: UUID {
        UUID()
    }
    case gallery
    case picture
}

struct ContentView: View {
    
    /// 2.
    @State private var showingType: PhotoSheetType?
    @State private var showingActionSheet = false
    @State var imageTemp : Data = (UIImage(systemName: "photo.on.rectangle.angled")?.jpegData(compressionQuality: 1))!
    
    var body: some View {
        NavigationView {
            Image(uiImage: UIImage(data: imageTemp)!)
                .onTapGesture {
                    self.showingActionSheet = true
                }
                .actionSheet(isPresented: $showingActionSheet) {
                    ActionSheet(
                        title: Text("Image selector"),
                        message: Text("Select an image"),
                        buttons: [
                            .default(Text("Select from Gallery")) {
                                showingType = .gallery /// 3.
                            },
                            .default(Text("Take new picture")) {
                                showingType = .picture /// 3.
                            },
                            .cancel()
                        ]
                    )
                }            /// 4.
                .sheet(item: $showingType) { type in 
                    if type == .gallery {
                        ImagePicker(sourceType: .photoLibrary, showingType: $showingType, image: self.$imageTemp)
                    } else {
                        ImagePicker(sourceType: .camera, showingType: $showingType, image: self.$imageTemp)
                    }
                }
        }
    }
}

您还需要修改 ImagePicker，以便 Binding 接受 PhotoSheetType? 而不是 Bool。要关闭 sheet，只需将 showingType 设置为 nil。

struct ImagePicker: UIViewControllerRepresentable {
    var sourceType: UIImagePickerController.SourceType = .photoLibrary
    
    @Binding var showingType: PhotoSheetType?
    @Binding var image: Data
    
    func makeCoordinator() -> ImagePicker.Coordinator {
        let imagePicker = UIImagePickerController()
        return ImagePicker.Coordinator(child1: self)
    }
    
    func makeUIViewController(context: UIViewControllerRepresentableContext<ImagePicker>) -> UIImagePickerController {
        let picker = UIImagePickerController()
        picker.delegate = context.coordinator
        picker.sourceType = sourceType
        return picker
    }
    
    func updateUIViewController(_ uiViewController: UIImagePickerController, context: UIViewControllerRepresentableContext<ImagePicker>) {
        
    }
    
    class Coordinator: NSObject, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
        var child : ImagePicker
        init(child1: ImagePicker) {
            child = child1
        }
        
        
        func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
            self.child.showingType = nil /// set to nil here
        }
        
        func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any]) {
            let image = info[.originalImage] as! UIImage
            let data = image.jpegData(compressionQuality: 0.45)
            self.child.image = data!
            self.child.showingType = nil /// set to nil here
        }
    }
}

为每个 Action Sheet 按钮添加不同的修饰符

Add a different modifier to each Action Sheet button

swiftui

imagepicker

swiftui-actionsheet