小编Jak*_*ake的帖子

有没有人有解决以下崩溃的方法？

我有一个通过 NavigationLink 在父导航控制器中显示的表单，如下所示：

    var body: some View {
        NavigationView {
            NavigationLink(destination: PickerView()) {
                Text("Picker View")
            }
        }
    }

PickerView 有三个选择器。第一个确定显示其他哪些：

struct PickerView: View {
    @State var sectionValue = "pet"
    @State var petValue = "dog"
    @State var fruitValue = "apple"
    @State var foodValue = "pasta"
    var body: some View {

        Form {

            Picker(selection: $sectionValue, label: Text("What is your favorite?")) {
                Text("Pet").tag("pet")
                Text("Fruits").tag("fruits")
                Text("Foods").tag("foods")
            }

            if (sectionValue == "pet") {
                Picker(selection: $petValue, label: Text("Favorite pet")) {
                    Text("Dog").tag("dog")
                    Text("Cat").tag("cat")
                    Text("Lizard").tag("lizard")
                }
            } …