Swiftui 导航按钮可以'；不排除模态

SwiftUI在

.sheet

上有我无法解决的意外行为。下面是一个简单的主视图>详细视图，它使用相同的模式。一个在

NavigationView

中，另一个在

中。navigationBarItems

中：

struct MasterView: View {
    @State var showModal: Bool = false
    var modal: some View {
        ModalView(showModal: $showModal)
    }
    var body: some View {
        NavigationView {
            VStack {
                Button("Can be dismissed") { self.showModal = true }.sheet(isPresented: $showModal) { self.modal }
                NavigationLink(destination: DetailView()) { Text("Can't be dismissed") }
            }
        }
    }
}

struct DetailView: View {
    @State var showModal: Bool = false
    var modal: some View {
        ModalView(showModal: $showModal)
    }
    var body: some View {
        Text("Detail View")
            .navigationBarItems(trailing: Button("Dismisss?") { self.showModal = true }.sheet(isPresented: $showModal) { self.modal })
    }
}

struct ModalView: View {
    @Binding var showModal: Bool
    var body: some View {
        VStack {
            Text("Modal View")
            Button("Dismiss") { self.showModal = false }
        }
    }
}

问题是，尽管可以通过

MasterView

中的

按钮

解除

ModalView

，但不能通过

详细视图中的
导航项
解除

有人知道如何解除从
.navigationBarItems
调用的
.sheet
吗

编辑：有趣的是，如果你切换

 Text("Detail View")

与

您会得到非常意外的结果，导致禁用
.navigationBarItems
，除非通过拖动手势取消模式

编辑2：此行为现在已作为id为FB6891155的错误提交，这肯定会导致错误报告。起初，我认为使用
@Environment（\.presentationMode）
可能会解决这个问题，但它绝对不会改变行为

我确实发现，如果您只有1张
工作表
，则可以将模态设置为可忽略。也就是说，如果从
详细视图中删除
工作表
调用

struct MasterView: View {
    @State var showModal: Bool = false

    var modal: some View {
        ModalView()
    }
    var body: some View {
        NavigationView {
            VStack {
                Button("Can be dismissed") { self.showModal = true }.sheet(isPresented: $showModal) { self.modal }
                NavigationLink(destination: DetailView(showModal: $showModal)) { Text("Can't be dismissed") }
            }
        }
    }
}

struct DetailView: View {
    @Binding var showModal: Bool

    var body: some View {
        Text("Detail View")
            .navigationBarItems(trailing: Button("Dismisss?") { self.showModal = true })
    }
}

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

    var body: some View {
        VStack {
            Text("Modal View")
            Button("Dismiss") {
                self.showModal.value.dismiss()
            }
        }
    }
}

虽然这确实使模式在编程上不可接受，但最终会遇到您提到的第二个错误，即
.navigationBarItems
在您返回之前是禁用的


struct MasterView: View {
    @State var showModal: Bool = false

    var modal: some View {
        ModalView()
    }
    var body: some View {
        NavigationView {
            VStack {
                Button("Can be dismissed") { self.showModal = true }.sheet(isPresented: $showModal) { self.modal }
                NavigationLink(destination: DetailView(showModal: $showModal)) { Text("Can't be dismissed") }
            }
        }
    }
}

struct DetailView: View {
    @Binding var showModal: Bool

    var body: some View {
        Text("Detail View")
            .navigationBarItems(trailing: Button("Dismisss?") { self.showModal = true })
    }
}

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

    var body: some View {
        VStack {
            Text("Modal View")
            Button("Dismiss") {
                self.showModal.value.dismiss()
            }
        }
    }
}