How to set Keyboard type of TextField in SwiftUI?

问题

I can't seem to find any information or figure out how to set the keyboard type on a TextField for SwiftUI. It would also be nice to be able to enable the secure text property, to hide passwords etc.

This post shows how to "wrap" a UITextField, but I'd rather not use any UI-controls if I don't have to. How to make TextField become first responder?

Anyone have any ideas how this can be done without wrapping an old school UI control?

回答1:

To create a field where you can enter secure text you can use SecureField($password)

https://developer.apple.com/documentation/swiftui/securefield

If you want to set the contentType of an textField to eg. .oneTimeCode you can do it like this. Also works with keyboardType

TextField($code)
    .textContentType(.oneTimeCode)
    .keyboardType(.numberPad)

回答2:

We no longer need to use hacks. Beta 5 has brought a new modifier to set the keyboard type. For example, to use a number pad:

.keyboardType(.numberPad)

There's also autocapitalization() and an EnvironmentValue disableAutocorrection.

回答3:

The following wraps a UITextField class called UIKitTextField using UIViewRepresentable. The keyboard type is set to .decimalPad but could be set to any valid keyboard type.

//  UIKitTextField.swift

import UIKit

class UIKitTextField: UITextField, UITextFieldDelegate {

  required init(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)!
    delegate = self
  }

  required override init(frame: CGRect) {
    super.init(frame: frame)
    delegate = self
    self.setContentHuggingPriority(.defaultHigh, for: .vertical)
  }
}

In the ContentView.Swift I created two TextFields. The first is the wrapped UIKit UITextField and the second is the SwiftUI TextField. The data binding is the same so each will display the same text as it is entered.

// ContentView.Swift

import SwiftUI
import UIKit

struct MyTextField : UIViewRepresentable {

  @Binding var myText: String

  func makeCoordinator() -> MyTextField.Coordinator {
    return Coordinator(text: $myText)
  }

  class Coordinator: NSObject {
    @Binding var text: String
    init(text: Binding<String>) {
      $text = text
    }

    @objc func textFieldEditingChanged(_ sender: UIKitTextField) {
      self.text = sender.text ?? ""
    }
  }

  func makeUIView(context: Context) -> UIKitTextField {

    let myTextField = UIKitTextField(frame: .zero)

    myTextField.addTarget(context.coordinator, action: #selector(Coordinator.textFieldEditingChanged(_:)), for: .editingChanged)

    myTextField.text = self.myText
    myTextField.placeholder = "placeholder"
    myTextField.borderStyle = .roundedRect
    myTextField.keyboardType = .decimalPad

    return myTextField
  }

  func updateUIView(_ uiView: UIKitTextField,
                    context: Context) {
    uiView.text = self.myText
  }

}


struct MyTextFieldView: View {
  @State var myText: String = "Test"
  var body: some View {
    VStack {
      MyTextField(myText: $myText)
        .padding()
      TextField($myText)
        .textFieldStyle(.roundedBorder)
        .padding()
    }
  }
}

#if DEBUG
struct ContentView_Previews : PreviewProvider {
  static var previews: some View {
    Group{
      MyTextFieldView().previewLayout(.sizeThatFits)
      MyTextFieldView().previewDevice("iPhone Xs")
    }
  }
}
#endif

回答4:

Set .keyboardType(.numberPad) on the TextField. Simple!

回答5:

I'm the dev that answered that post - there's no official way to do so at the moment. Your best bet at the moment is to wrap UITextField – Matteo Pacini

That sums it up, guess we are stuck with wrapping UITextField for now.

回答6:

To set TextField's keyboard type you need to add modifier .keyboardType().

TextField(placeHolder, text: your text)
    .keyboardType(.numberPad)

来源：https://stackoverflow.com/questions/56517515/how-to-set-keyboard-type-of-textfield-in-swiftui