如何设置UIViewRepresentable的大小? [英] How to set the size of an UIViewRepresentable?

问题描述

我的想法是这样的:无论SwiftUI尚未提供什么，都可以使用UIViewRepresentable来解决.因此，我着手为TTTAttributedLabel制作一个UIViewRepresentable.

The idea, I thought, was this: whatever is not provided yet in SwiftUI, one can get around using UIViewRepresentable. So I set out to make a UIViewRepresentable for TTTAttributedLabel.

但是API中缺少一些基本知识，或者我缺少一些基本知识:如何设置UIViewRepresentable的内在内容大小"?

But there is something basic missing in the API, or I am missing something basic: how can one set the "intrinsic content size" of the UIViewRepresentable?

很像SwiftUI Text ，我希望我的组件能够根据容器的大小将其自身设置为一定的大小.

Much like a SwiftUI Text, I would want my component to be able to set itself to a certain size considering the size of its container.

我的第一个想法是使用固有内容大小，所以我创建了这个:

My first idea was to use intrinsic content sizes, so I created this:

class SizeRepresentableView: UILabel {
    override init(frame: CGRect) {
        super.init(frame: CGRect.zero)
        text="hello"
        backgroundColor = UIColor.systemYellow
    }

    override var intrinsicContentSize: CGSize {
        return CGSize(width: 100, height: 100)
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

struct SizeRepresentable: UIViewRepresentable {
    func updateUIView(_ uiView: SizeRepresentableView, context: Context) {
    }

    typealias UIViewType = SizeRepresentableView

    func makeUIView(context: UIViewRepresentableContext<SizeRepresentable>) -> SizeRepresentableView {
        let v = SizeRepresentableView(frame: CGRect.zero)
        return v
    }
}

struct SizeRepresentableTest: View {
    var body: some View {
        VStack {
            SizeRepresentable()
            Spacer()
        }
    }
}

struct SizeRepresentable_Previews: PreviewProvider {
    static var previews: some View {
        SizeRepresentableTest()
    }
}

但这不起作用.标签占用了所有空间，间隔符则没有.使用SwiftUI Text 而不是我的 SizeRepresentable ，标签可以整齐地排列在顶部，并且分隔符会占据所有空间.

but that does not work. The label takes up all the space, the spacer none. With a SwiftUI Text instead of my SizeRepresentable the label is neatly arranged on top and the spacer takes up all the space, as it should.

我似乎找不到任何有关如何布局UIViewRepresentable的文档.

I can't seem to find any documentation about how to layout a UIViewRepresentable.

解决这个问题的方法是什么?

What is the way to solve this?

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