Swiftui - 仅显示视图的百分比 [英] Swiftui - only show a percentage of a view

问题描述

我有一个 RoundedRectangle，我的目标是在它上面放置另一个 RoundedRectangle，这样叠加层就会显示完成百分比".不过，我似乎找不到合适的咒语来做到这一点.

I have a RoundedRectangle, and my objective is to lay another RoundedRectangle over it such that the overlay shows a "percentage complete". I can't seem to find the proper incantation to do so, though.

我认为理想情况下，叠加层应该以某种方式仅显示其自身的一部分.调整自身大小以匹配百分比会扭曲叠加层的形状.

I think that ideally, the overlay should somehow only show a percentage of itself. Resizing itself to match the percentage skews the shape of the overlay.

import PlaygroundSupport

struct ContentView: View {

    @State private var value: Double = 0

    var body: some View {
        GeometryReader { geom in
            VStack {
                Slider(value: self.$value, in: 0...1, step: 0.01)

                ZStack {
                    ZStack(alignment: .leading) {

                        // The main rectangle
                        RoundedRectangle(cornerRadius: 10)
                            .fill(Color.blue)
                            .frame(width: geom.size.width,
                                   height: 200)

                        // The progress indicator...
                        RoundedRectangle(cornerRadius: 10)
                            .fill(Color.red)
                            .opacity(0.5)
                            .frame(width: CGFloat(self.value) * geom.size.width,
                                   height: 200)
                    }

                    Text("\(Int(self.value * 100)) %")
                }
            }
        }
        .padding()
    }
}

PlaygroundPage.current.setLiveView(ContentView())

在上面的操场中，如果您查看 1%、2% 甚至 3%，您可以看到红色叠加层超出了左上角和左下角的蓝色背景矩形边界.见下图.

In the above playground, if you look at 1, 2, or even 3 %, you can see that the red overlay is out of the blue background rectangle bounds in the upper and lower left. See image below.

我觉得这不是正确的解决方案，但我也找不到合适的组合(尝试 scaleEffect，一堆 offset 和 position 数学)来真正做到这一点.

I feel like this is not the proper solution, but I also couldn't find the right mix of things (trying scaleEffect, a bunch of offset and position math) to really nail it.

对我来说，就像我上面说的，当值为 0.4 时，感觉叠加层应该能够说只让我最左边的 40% 可见".

To me, like I said above, it feels like the overlay should be able to say "only make my left-most 40% visible" when the value is 0.4.

那是冗长的，我为此道歉.如果您已读到这里，并有任何建议要传授，我将不胜感激.

That was long-winded, I apologize for that. If you've read this far, and have any advice to impart, I'd be incredibly appreciative.

谢谢！

推荐答案

这是我处理它的方式，所以我不必管理多个 cornerRadius.

This how I approach it so I don't have to manage more than one cornerRadius.

VStack {
    ZStack(alignment: .leading) {

        // The main rectangle
        Rectangle()
            .fill(Color.blue)
            .frame(width: geom.size.width,
                   height: 200)

        // The progress indicator...
        Rectangle()
            .fill(Color.red)
            .opacity(0.5)
            .frame(width: CGFloat(self.value) * geom.size.width,
                   height: 200)
    }
    .cornerRadius(10)

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