使用 SwiftUI 启动 TextField 时出现 VStack 错误

Question

There are no errors until I create this TextField .

Also, there are no errors if I create a TextField("Placeholder", text: .constant("")) like this.

I am trying to use the data from the TextField which is of type Int.

struct ContentView: View {
    @State private var answer: Int = 0

    var body: some View {
        VStack(alignment: .center) {
            Text("some text")
            Spacer()
            TextField($answer)
        }
    }
}

Answer 1

The error is with the TextField and it actually:

Cannot invoke initializer for type 'TextField<_>' with an argument list of type '(Binding)'

To fix that, You need to first provide a title and the label of the binding argument: text :

TextField("This can be an empty string", text: $answerString)

And note that TextField can not accept a number as the binding argument alone! You must also provide a Formatter to make it working:

TextField("", value: $answer, formatter: NumberFormatter())

Also as I mentioned here , you should not trust Xcode error reasons, Specially when you are working with SwiftUI.