swiftui - 在 Picker 标签中使用隐藏 ProgressView 时崩溃

Question

我想放一个 ProgressView里面Picker标签。当我点击 Hide Spinner 按钮时，这(间歇性)会因 EXC_BAD_ACCESS(代码=EXC_I386_GPFLT)崩溃。

struct ContentView: View {
    @State private var selectedCity = ""
    @State private var showSpinner = true
    
    let cities = [
        "Calgary",
        "Edmonton",
        "Toronto"
    ]
    
    var body: some View {
        NavigationView {
            VStack(spacing: 0) {
                Form {
                    Picker(selection: $selectedCity, label:
                            HStack {
                                Text("Your City")
                                if showSpinner {
                                    ProgressView()
                                        .padding(.horizontal, 2)
                                }
                            }
                    ) {
                        ForEach(cities, id: \.self) { city in
                            Text(city).tag(city)
                        }
                    }
                    
                    Button("Hide Spinner", action: { showSpinner = false })
                }
            }
            .navigationBarTitle("ProgressView Crash", displayMode: .inline)
        }
    }
}

我做错了什么吗？我猜这是一个 SwiftUI 错误。包装 UIActivityIndicatorView 时我得到相同的行为在 UIViewRepresentable .

Answer 1

是的，它看起来像是一个带有自动生成的可访问性标签的错误。安全的解决方法是使用明确提供的可访问性。
使用 Xcode 12/iOS 14 测试

Picker(selection: $selectedCity, label:
        HStack {
            Text("Your City")
            if showSpinner {
                ProgressView()
                    .padding(.horizontal, 2)
            }
        }.accessibility(label: Text("Your City"))      // << here !!
) {
    ForEach(cities, id: \.self) { city in
        Text(city).tag(city)
    }
}