SwiftUI在PresentationMode上随机崩溃？.wrappedValue.dismiss()

Question

这就是崩溃的样子

所以它随机崩溃在UIKit行上

UIKitCore
-[UIViewController _ancestorViewControllerOfClass:allowModalParent:] + 44

我在默认的SwiftUI导航堆栈中有View:

struct MyView: View {
  @EnvironmentObject var viewModel: MyViewModel
  @Environment(\.presentationMode) var presentationMode: Binding<PresentationMode>

var body: some View {
    ZStack {
      ......
    }
    .onAppear {
      self.viewModel
        .onViewAppear(presentationMode: self.presentationMode)
    }
  }
}

final class MyViewModel {
  var presentationMode: Binding<PresentationMode>?

  func onViewAppear(presentationMode: Binding<PresentationMode>) {
    self.presentationMode = presentationMode
  }

  func hide() {
    presentationMode?.wrappedValue.dismiss() // crashes after calling this
  }
}

因此，我以这种方式将MyView插入导航堆栈:

NavigationLink(
      destination: MyView()
    ) {
      Image(systemName: "plus.circle")
        .font(.title)
    }

然后，在几秒钟后用户按下MyView中的按钮后，我在MyViewModel中调用 hide()。它几乎一直都在工作，但在5-10％的情况下会崩溃。

Answer 1

对我来说，解决的方法是设置.navigationViewStyle(StackNavigationViewStyle())

NavigationView { content }.navigationViewStyle(StackNavigationViewStyle())