Question

我试图在我的SwiftUI应用中将数据（incomeAmount）从第一个视图传递到第二个视图，但是我需要声明BindingString。我需要声明BindingString是什么意思？

查看1


struct ContentView: View {
    @State var incomeAmount = ""
    
    var body: some View {
        NavigationView {
                VStack {
                    TextField("Your income amount", text: $incomeAmount)
                        .frame(width: 300)
                        .padding(.bottom, 30)
                    
                    
                    NavigationLink(destination: NewView()){
                            
                            Text("Continue")
                                .frame(width: 300, height: 50, alignment: .center)
                                .background(Color.black)
                                .cornerRadius(130)
                                .foregroundColor(.white)
                                .padding(.bottom, 30)
                        }
                    
                    Text("$\(incomeAmount)")
                        
                    
                }.navigationTitle("First View")
            }
        }
    }

查看2


struct NewView: View {
    @Binding var incomeAmount: String
    
    var body: some View {
        NavigationView {
            VStack {
                Text("$\(incomeAmount)")
            }
        }.navigationTitle("Second View")
    }
}

struct NewView_Previews: PreviewProvider {
    static var previews: some View {
        NewView(incomeAmount: <#Binding<String>#>)
    }
}

Answer 1

要将收入金额传递到第二个视图，您必须执行以下操作：

NavigationLink(destination: NewView(incomeAmount: $incomeAmount)) { ... }

此外，您需要将其提供给：

struct NewView_Previews: PreviewProvider {
static var previews: some View {
    NewView(incomeAmount: .constant("something here"))
}
}

由于在PreviewProvider中，NewView希望传入一个Binding 。因此，您需要提供它。

在SwiftUI中将数据传递到第二个视图

1 个答案: