為每個操作表按鈕添加不同的修飾符

Question

這可能是一個非常簡單的問題，但我找不到答案。

我正在嘗試使用兩個按鈕（以及一個取消按鈕）構建一個 ActionSheet：

1. 按鈕“從圖庫中選擇”打開一個imagePicker ，其中sourceType設置為.photoLibrary 。
2. 按鈕“拍一張新照片”打開一個imagePicker ，其中sourceType設置為.camera 。

我已經成功地制作了 ActionSheet 和 imagePicker，但是無法確定在哪里添加修飾符來告訴每個按鈕應該使用哪個 sourceType。 我設法在像這樣的普通按鈕中的sheet()修飾符中將它添加到 ActionSheet 之外，並且一切正常：

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，我看不到在 ActionSheet 中包含此信息的位置。 非常感謝任何可以提供幫助的人，我希望這很清楚:-)

這是我的代碼：

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()
                            ]
                            )
                        }
                 }
         }
}

而且，以防萬一，這是我的 imagePicker 的代碼，盡管我認為這可能沒有必要。

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

您的問題幾乎可以歸結為“我怎樣才能呈現多張紙？”，所以這個線程可能會有所幫助。

1. 定義一個新的enum以包含可能的工作表類型（圖庫/拍照）
2. 聲明一個@State屬性來保存當前的工作表類型。 它是可選的，因為當它為 nil 時，將不會顯示工作表。
3. 將屬性設置為您想要的類型
4. 使用sheet(item:onDismiss:content:)代替sheet(isPresented:onDismiss:content:) 。 isPresented最適合 static 板材。 item用於當您有多種工作表類型時，這是您想要的。

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)
                    }
                }
        }
    }
}

您還需要修改ImagePicker以便Binding采用PhotoSheetType? 而不是Bool 。 要關閉工作表，只需將showingType設置為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
        }
    }
}