swiftUI转换:从某个框架缩放-就像打开应用程序时iOS Homescreen所做的一样 [英] swiftUI transitions: Scale from some frame - like iOS Homescreen is doing when opening an App

问题描述

在打开应用程序时，如何获得iOS主屏幕在翻译中的效果:它会从主屏幕上的应用程序图标开始将应用程序缩放为全屏显示?

How do I get the effect in a translation, that iOS home screen does when opening an App: It scales the App to fullscreen, starting from the App-icon on the home screen?

在我的代码中，我具有带有位置，宽度和高度的图标框架(CGRect)，并且具有最后一个框架.是否有一种方法(可能结合了一些过渡)以从图标帧缩放到最终帧?

In my code, I have the icon-frame (CGRect) with position, width and height and I have the final frame. Is there a way to (probably combine some) transitions to get a scaling from the icon-frame to the final frame?

与以下内容类似:

view.transition(AnyTransition.scale(scale: 0, anchor: UnitPoint.trailing))

从尾随中心位置开始，从零缩放到原始大小. 只能通过以下方式关闭:

Which scales from zero to the original size, starting from trailing center position. It's only close as:

• 从零开始缩放，而不是原始图标的大小
• 它从一个固定点(尾随，居中)开始，但是我想让它从图标所在的地方开始.

只需确保:它必须是过渡，因为视图是新创建和删除的.我尝试过保留视图，只是更改其不透明度以显示/隐藏它.当视图消失时，还有许多其他问题，例如无法获得反向动画.

Just to be sure: It must be a transition as the view is newly created and dropped. I tried with keeping the view and just change its opacity to show/hide it. With many other problems like not getting the reverse animation, when the view disappears.

推荐答案

此处演示了如何通过组合转换来实现这种效果...(位置和大小均经过硬编码，以简化演示-可以通过以下方式阅读它们:几何形状读取器，对齐参考线或锚定首选项，并且实际上不影响过渡使用思路，也可以配置动画)

Here is a demo of idea how such effect could be done with combined transitions... (positions and sizes are hardcoded for demo simplicity - they can be read with geometry reader, alignment guides or anchor preferences, and actually do not affect the transition usage idea, also animation can be configured)

演示:

struct TestRisingView: View {

    let screen = UIScreen.main.bounds

    @State var showingView = false
    @State var btFrame: CGRect = .zero

    var body: some View {
        GeometryReader { g in
            ZStack {
                Rectangle().fill(Color.clear)

                self.activatingButton(frame: CGRect(x: 80, y: 30, width: 60, height: 40))
                self.activatingButton(frame: CGRect(x: self.screen.maxX - 80, y: 30, width: 60, height: 40))
                self.activatingButton(frame: CGRect(x: self.screen.maxX - 80, y: self.screen.maxY - 60, width: 60, height: 40))
                self.activatingButton(frame: CGRect(x: 80, y: self.screen.maxY - 60, width: 60, height: 40))

                if self.showingView {
                    self.topView
                        .zIndex(1)
                        .transition(
                            AnyTransition.scale(scale: 0.12).combined(with:
                            AnyTransition.offset(x: self.btFrame.origin.x - g.size.width/2.0,
                                                 y: self.btFrame.origin.y - g.size.height/2.0))
                        )
                }
            }
        }
    }

    func activatingButton(frame: CGRect) -> some View {
        Button(action: {
            withAnimation {
                self.btFrame = frame
                self.showingView.toggle()
            }
        }) {
            Text("Tap")
                .padding()
                .background(Color.yellow)
        }
        .position(frame.origin)
    }

    var topView: some View {
        Rectangle()
            .fill(Color.green)
            .frame(width: 300, height: 400)
    }
}

struct TestRisingView_Previews: PreviewProvider {
    static var previews: some View {
        TestRisingView()
    }
}

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