Question

我正在尝试从模态内部关闭模态。问题是，我想从NavigationBarItem打开Modal。 Ive提供了一些演示代码，以及在某些情况下可以工作的示例和

案例01

1. Openning from NavigationBarItem
2. Closing by pressing Button in Modal
3. Openning again from Button -> WORKS

案例02

1. Openning from NavigationBarItem
2. Closing by swiping down
3. Openning again from NavigationBarItem -> WORKS

案例03

1. Openning from Button
2. Closing from Button
3. Openning again from NavigationBarItem -> DOESNT WORK

->问题似乎是当我按下按钮关闭时，模态关闭，但在后台仍被标记为活动状态。之后再按NavigationBarButton时，我在控制台中收到此错误：

Warning: Attempt to present <_TtGC7SwiftUIP13$7fff2c684d1c22SheetHostingControllerVS_7AnyView_: 0x7f9a6c52b3c0>  on <UINavigationController: 0x7f9a6d85c200> which is already presenting (null)

这是代码：

struct TestView: View {

    @State var showModal: Bool = false

    var body: some View {
        NavigationView {
            Button(action: {
                self.showModal.toggle()
            }) {
                Text("Show Modal")
            }.sheet(isPresented: $showModal) {
                ModalView()
            }
            .navigationBarItems(trailing:
                Button(action: {
                    self.showModal.toggle()
                }) {
                    Text("Show Modal")
                }.sheet(isPresented: $showModal) {
                    ModalView()
                }
            )
        }
    }
}

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

    func dismiss() {
        self.presentationMode.wrappedValue.dismiss()
    }

    var body: some View {
        Button(action: {
            self.dismiss()
        }) {
            Text("Save").bold()
        }
    }
}

Answer 1

遇到此问题，我做了以下事情：


struct TestView: View {

    @State var showModal: Bool = false

    var body: some View {
        NavigationView {
            Button(action: {
                self.showModal.toggle()
            }) {
                Text("Show Modal")
            }
            .navigationBarItems(trailing:
                Button(action: {
                    self.showModal.toggle()
                }) {
                    Text("Show Modal")
                }
            )
        }.sheet(isPresented: $showModal) {
            ModalView()
        }
    }
}

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

    func dismiss() {
        self.presentationMode.wrappedValue.dismiss()
    }

    var body: some View {
        Button(action: {
            self.dismiss()
        }) {
            Text("Save").bold()
        }
    }
}

我希望这会有所帮助！

我无法通过按钮关闭模式并从NavigationBar

1 个答案: