我使用自定义UIViewRepresentable在iOS上运行它。用法如下：

struct Content: View {
    @State var open = false
    @State var popoverSize = CGSize(width: 300,height: 300)

    var body: some View {
        WithPopover(
            showPopover: $open,popoverSize: popoverSize,content: {
                Button(action: { self.open.toggle() }) {
                    Text("Tap me")
                }
        },popoverContent: {
                VStack {
                    Button(action: { self.popoverSize = CGSize(width: 300,height: 600)}) {
                        Text("Increase size")
                    }
                    Button(action: { self.open = false}) {
                        Text("Close")
                    }
                }
        })
    }
}

还有here is a gist和WithPopover的来源

仅macOS

这里是如何动态更改弹出框的方法...为简单起见，它没有动画，由您决定。

struct TestCustomSizePopover: View {
    @State var popover7 = false
    var body: some View {
        VStack {
            Button("Popover") {
                    self.popover7.toggle()
            }.popover(isPresented: self.$popover7,arrowEdge: .bottom) {
                     PopoverView()
            }
        }.frame(width: 800,height: 600)
    }
}

struct PopoverView: View {
    @State var adaptableHeight = CGFloat(100)
    var body: some View {
        VStack {
                Text("Popover").padding()
                Button(action: {
                    self.adaptableHeight = 300
                }) {
                    Text("Button")
                }
            }
            .frame(width: 100,height: adaptableHeight)
    }
}