SwiftUI:调整弹出框的大小以适合 [英] SwiftUI: Sizing a popover to fit

问题描述

我有一个小弹出框示例，其中一个按钮会触发一个弹出框.弹出框只包含一点 UI，在这种情况下是两个按钮，但它仍然占用了大量空间，而不是像我习惯的 UIKit 那样整齐地环绕内容.如何使弹出框适合内容的大小?

I've got a little popover sample in which a button triggers a popover. The popover only contains a little bit of UI, two buttons in this case, but it still takes up a lot of space instead of wrapping neatly around the content like I'm used to from UIKit. How do I make the popover fit to the size of the content?

来自 iPad 模拟器的屏幕截图和以下代码:

Screenshot from the iPad simulator and code below:

struct ContentView: View {

    @State private var showingPopupA = false

    var body: some View {
        HStack {
            Button(action: {
                self.showingPopupA.toggle()
            }, label: {
                Text("Button")
            }).popover(isPresented: self.$showingPopupA) {
                VStack {
                    Button(action: {
                        // Do something
                        self.showingPopupA = false
                    }) {
                        Text("Option A")
                    }
                    Button(action: {
                        // Do something
                        self.showingPopupA = false
                    }) {
                        Text("Option B")
                    }
                }.background(Color.red)
            }
        }
    }
}

macOS 截图:

推荐答案

在 macOS 上，以下代码如下所示:

On macOS the code below will look like this:

struct PopoverExample: View {

    @State private var showingPopupA:Bool = false 
    var body: some View {
        HStack {
            Button(action: {
                self.showingPopupA.toggle()
            }, label: {
                Text("Button")
            }).popover(isPresented: self.$showingPopupA) {
                VStack {
                    Button(action: {
                        // Do something
                        self.showingPopupA = false
                    }) {
                        Text("Option A")
                    }
                    Button(action: {
                        // Do something
                        self.showingPopupA = false
                    }) {
                        Text("Option B")
                    }
                }.background(Color.red)
            }
        }
        .frame( maxWidth: .infinity, maxHeight: .infinity)
    }
}

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