如何找到 SwiftUI UIViewRepresentable 的框架

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英文:

How to find the frame of a SwiftUI UIViewRepresentable

问题

我正在尝试将UILabel的自定义子类包装在UIViewRepresentable中,以便在SwiftUI中使用它。我正在使用.sizeToFit并打印框架,当它在包装器中时,它看起来正确:

func makeUIView(context: Context) -> CustomUILabel {
    let view = CustomUILabel()
    view.customProperty = model.customProperty
    view.sizeToFit()
    print(model.latex, view.frame.size) // 这会打印正确的大小,如何传播?
    return view
}

但当我在VStack中运行这个代码时,它以可能的最大空间绘制UIViewRepresentable

var body: some View {
    GeometryReader { geometry in
        VStack(spacing: 0) {
            Rectangle()
                .fill(Color.red)
                .frame(height: geometry.size.height/2 - 5 + self.draggedOffset.height)
            Rectangle()
                .fill(Color.orange)
                .frame(height: 10)
            custonView(model: self.model)
            Spacer()
        }
    }
}

是否有一种方法可以将UIView的大小传播到其父视图,类似于在本地SwiftUI视图上使用首选项键的方式?

英文:

I'm trying to wrap a custom subclass of UILabel in UIViewRepresentable to use it in SwiftUI. I'm using .sizeToFit and printing the frame, and it looks right while it's in the wrapper:

func makeUIView(context: Context) -> CustomUILabel {
    let view = CustomUILabel()
    view.customProperty = model.customProperty
    view.sizeToFit()
    print(model.latex,view.frame.size) // this prints the correct size, how to propagate?
    return view
}

but when I run this in a VStack, it draws the UIViewRepresentable with the maximum space possible.

var body: some View {
    GeometryReader{ geometry in
        VStack(spacing: 0){
            Rectangle()
                .fill(Color.red)
                .frame( height: geometry.size.height/2 - 5 + self.draggedOffset.height)
            Rectangle()
                .fill(Color.orange)
                .frame(height: 10)
            custonView(model:self.model)
            Spacer()
    }
}

Is there a way to propagate the size of the UIView to its parent, similar to how you use preference keys on a native SwiftUI view?

答案1

得分: 3

这是由于使用了 GeometryReader

尝试使用:

customView(model: self.model)
    .fixedSize()
英文:

It is due to use of GeometryReader

Try to use

custonView(model:self.model)
    .fixedSize()

答案2

得分: 1

当使用 UIViewRepresentable 时,你所描述的贪婪行为是由 contentHuggingPriority 控制的,就像在 UIKit 中一直是的一样。

因此,在你的 makeUIView 函数中,你可以这样做:

// 抵制被拉伸至比本身固有尺寸更大
view.setContentHuggingPriority(.defaultHigh, for: .horizontal)
view.setContentHuggingPriority(.defaultHigh, for: .vertical)
英文:

When using UIViewRepresentable, the greediness you describe is controlled using the contentHuggingPriority, just like it always was in UIKit.

So in your makeUIView function, you can do this:

// resist being made larger than the intrinsicContentSize
view.setContentHuggingPriority(.defaultHigh, for: .horizontal)
view.setContentHuggingPriority(.defaultHigh, for: .vertical)

huangapple
  • 本文由 发表于 2020年1月3日 14:02:46
  • 转载请务必保留本文链接:https://go.coder-hub.com/59573879.html
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