ios - 需要从 Api Uikit 类到几何阅读器的等效值

Question

错误消息在这里我是 swift 的新手。尝试调整 UIImage 高度和 UIImage 位置时在 .view 中出现错误。我只想从画布中获取绘图并对其进行自定义。

struct PKCanvas: UIViewRepresentable {
class Coordinator: NSObject, PKCanvasViewDelegate {
    var pkCanvas: PKCanvas
   init(_ pkCanvas: PKCanvas) {
        self.pkCanvas = pkCanvas
    }
}
@Binding var color:UIColor
@Binding var clear:Bool
func makeCoordinator() -> Coordinator {
    Coordinator(self)
}
let canvas = PKCanvasView()
public func makeUIView(context: Context) -> PKCanvasView {
    let canvas = PKCanvasView()
    canvas.tool = PKInkingTool(.pencil, color: color, width: 10)
    canvas.backgroundColor = .clear
       }    
   }   
func preprocessImage() -> UIImage //   {
    var image = canvas.drawing.image(from: canvas.drawing.bounds, scale: 10.0)
    if let newImage = UIImage(color: .black, size: CGSize(width: canvas.frame.width, height: view.frame.height)){

        if let overlayedImage = newImage.image(byDrawingImage: 
image, 
inRect: CGRect(x: view.center.x, y: view.center.y, width: 
view.frame.width, height: view.frame.height)){
            image = overlayedImage
        }
    }

    return image
}

我想在这里调用 preprocessImage

 struct ContentView: View {
 @State var color = UIColor.white
 @State var clear = false
 @State var classificationLabel: String = ""
 let canvas = PKCanvasView()
 var body: some View {
 VStack{
    PKCanvas(color: $color, clear:$clear)
    VStack(){
        Button("Pencil"){ self.color = UIColor.black }
        Button("Classify"){
            self.detectImage() //want to call here
        }
        Button("Clear Canvas"){ self.clear.toggle() }
    }
 }
 }
 }