多个工作表(isPresented :)在SwiftUI中不起作用

问题描述

我的ContentView具有两个不同的模态视图，因此我对这两个都使用了sheet(isPresented:)，但是似乎只显示了最后一个.我该如何解决这个问题?还是无法在SwiftUI的视图上使用多个图纸?

I have this ContentView with two different modal views, so I'm using sheet(isPresented:) for both, but as it seems only the last one gets presented. How could I solve this issue? Or is it not possible to use multiple sheets on a view in SwiftUI?

struct ContentView: View {

    @State private var firstIsPresented = false
    @State private var secondIsPresented = false

    var body: some View {

        NavigationView {
            VStack(spacing: 20) {
                Button("First modal view") {
                    self.firstIsPresented.toggle()
                }
                Button ("Second modal view") {
                    self.secondIsPresented.toggle()
                }
            }
            .navigationBarTitle(Text("Multiple modal view problem"), displayMode: .inline)
            .sheet(isPresented: $firstIsPresented) {
                    Text("First modal view")
            }
            .sheet(isPresented: $secondIsPresented) {
                    Text("Only the second modal view works!")
            }
        }
    }
}

上面的代码编译时没有警告(Xcode 11.2.1).

The above code compiles without warnings (Xcode 11.2.1).

推荐答案

请尝试以下代码

enum ActiveSheet {
   case first, second
}

struct ContentView: View {

    @State private var showSheet = false
    @State private var activeSheet: ActiveSheet = .first

    var body: some View {

        NavigationView {
            VStack(spacing: 20) {
                Button("First modal view") {
                    self.showSheet = true
                    self.activeSheet = .first
                }
                Button ("Second modal view") {
                    self.showSheet = true
                    self.activeSheet = .second
                }
            }
            .navigationBarTitle(Text("Multiple modal view problem"), displayMode: .inline)
            .sheet(isPresented: $showSheet) {
                if self.activeSheet == .first {
                    Text("First modal view")
                }
                else {
                    Text("Only the second modal view works!")
                }
            }
        }
    }
}

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