ios - SwiftUI旋转屏幕使模式不再消失

Question

我在SwiftUI上有一个错误，当我旋转设备时，模式不再消失，这里的问题是，仅发生在模拟器上的设备上以及iPad上也能很好地工作。

import SwiftUI

struct modalView: View {
    @Environment(\.presentationMode) var presentationMode

    var body: some View {
        Button(action:{
            self.presentationMode.wrappedValue.dismiss()
        }){
            Text("close")
        }
    }
}

struct ContentView: View {
    @State var showModal = false
    var body: some View {
        Button(action: {
            showModal.toggle()
        }){
            Text("modal")
        }
        .sheet(isPresented: self.$showModal, content: {
            modalView()
        })
    }
}

[在我的设备上显示错误] [1]
自iOS 13以来我有这个问题
我目前在iOS 14.2 Beta上
和Xcode 12 GM
[1]: https://twitter.com/MisaelLandero/status/1306953785651142656?s=20

Answer 1

尝试使用如下形式:

struct ContentView: View {

  @State private var showModal = false

  // If you are getting the "can only present once" issue, add this here.
  // Fixes the problem, but not sure why; feel free to edit/explain below.
  @Environment(\.presentationMode) var presentationMode


  var body: some View {
    Button(action: {
        self.showModal = true
    }) {
        Text("Show modal")
    }.sheet(isPresented: self.$showModal) {
        ModalView()
    }
  }
}


struct ModalView: View {

  @Environment(\.presentationMode) private var presentationMode

  var body: some View {
    Group {
      Text("Modal view")
      Button(action: {
         self.presentationMode.wrappedValue.dismiss()
      }) {
        Text("Dismiss")
      }
    }
  }
}