将 ViewModifier 应用于 UIViewRepresentable [英] Apply ViewModifier to UIViewRepresentable

问题描述

我为 UITextField 创建了一个 UIViewRespresentable.我想应用修饰符:

I created a UIViewRespresentable for a UITextField. I'd like to apply modifiers:

myTextField.font(.headline).keyboardType(keyboardType)

这不起作用，即使我的 UIViewRepresentable 很简单:

This is not working, even if my UIViewRepresentable is simple:

class MyTextField: UITextField { ... }

struct MyFieldField: UIViewRepresentable {
    private let field = MyTextField()
    func makeUIView(context: Context) -> MyTextField { return field }
    func updateUIView(_ uiView: MyTextField, context: Context) {
        ...
    }
}

推荐答案

UITextField 是一个 UIKit 组件，而不是一个 SwiftUI 组件.它目前不尊重 .font() 或任何其他 SwiftUI 修饰符.此外，您目前无法从 SwiftUI UIFont 创建 UIFont代码>字体.因此，尽管您可以执行 @Environment(\.font) var font: Font 来获取当前值，但您将无法在 UIKit 领域使用它做任何有用的事情.

UITextField is a UIKit component, not a SwiftUI component. It doesn't currently respect .font() or any other SwiftUI modifiers. Furthermore, you cannot currently create a UIFont from a SwiftUI Font. So, although you can do @Environment(\.font) var font: Font to get the current value, you won't be able to do anything useful with it in UIKit land.

您可以:

1. 直接在你的 UIViewRepresentable
上设置一个 UIFont
2. 使用UIFont.TextStyle
3. Font.TextStyle 和 UIFont.TextStyle
之间的映射

1. Just set a UIFont directly on your UIViewRepresentable
2. Use UIFont.TextStyle
3. Map between Font.TextStyle and UIFont.TextStyle

对于其中任何一个，您都需要在 UIViewRepresentable 上显式创建一个变量来保存该值，然后在 updateUIView(context:)

With any of these you will need to explicitly create a variable on your UIViewRepresentable to hold that value, and then apply it during updateUIView(context:)

struct MyFieldField: UIViewRepresentable {
  // Your three options
  var myUIFont: UIFont
  var myUITextStyle: UIFont.TextStyle
  var mySwiftUITextStyle: Font.TextStyle // map this onto UIFont.TextStyle
  ...
}

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