“ImagePicker”类型的值没有成员“contentMode”

Posted 2023-02-24

【中文标题】“ImagePicker”类型的值没有成员“contentMode”

【英文标题】：Value of type 'ImagePicker' has no member 'contentMode'

【发布时间】：2021-04-27 12:51:34

【问题描述】：

我正在尝试使用下面列出的 contentMode，但我不明白为什么会收到以下错误：

无法根据成员“scaleAspectFit”推断上下文基础

           if let uiImage = info[UIImagePickerController.InfoKey.editedImage] as? UIImage 
               parent.contentMode = .scaleAspectFit    <--- Error
               parent.image = uiImage
           
           
           parent.presentationMode.wrappedValue.dismiss()
       
   

有什么提示吗？ 谢谢！

附上你找到的完整代码：

struct ImagePicker: UIViewControllerRepresentable 
    @Environment(\.presentationMode) var presentationMode
    @Binding var image: UIImage?
    
    func makeUIViewController(context: UIViewControllerRepresentableContext<ImagePicker>) -> UIImagePickerController 
        let picker = UIImagePickerController()
        picker.delegate = context.coordinator
        picker.allowsEditing = true
        
    //    picker.mediaTypes = ["public.image"]
        return picker
    
    
    func updateUIViewController(_ uiViewController: UIImagePickerController, context: UIViewControllerRepresentableContext<ImagePicker>) 
    
    class Coordinator: NSObject, UINavigationControllerDelegate, UIImagePickerControllerDelegate 
        let parent: ImagePicker
        
        init(_ parent: ImagePicker) 
            self.parent = parent
        
        
        func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any]) 
            if let uiImage = info[UIImagePickerController.InfoKey.editedImage] as? UIImage 
                parent.image.contentMode = .scaleAspectFit
                parent.image = uiImage
            
            
            parent.presentationMode.wrappedValue.dismiss()
        
    
    
    func makeCoordinator() -> Coordinator 
        Coordinator(self)
    

【参考方案1】：

添加contentMode 属性

struct ImagePicker: UIViewControllerRepresentable 
   @Environment(\.presentationMode) var presentationMode
   @Binding var image: UIImage? 
   @Binding var mode:UIView.ContentMode? // here

然后

parent.mode = .scaleAspectFit   

【讨论】：

谢谢！这就是解决方案！ :-)