UITextField，使用Swift 2自动移至1个字符后的下一个字符

Question

I have 4 UITextFields. After I enter the one character, I want the next UITextField to become active automatically, without having to press next .

I'm using Swift 2

Any idea?

Answer 1

To select the next textField you have to assign the first Responder. You can use the delegate methods of the textField to determine when the textfield should become active.

Answer 2

First set different tag for each UITextField . Then add UIControlEvents.editingChanged method.

When you connect @IBOutlet s and @IBAction s with your xib file, you'll get something like something like:

class ViewController: UIViewController {

      @IBOutlet weak var textField1: UITextField!
      @IBOutlet weak var textField2: UITextField!
      @IBOutlet weak var textField3: UITextField!
      @IBOutlet weak var textField4: UITextField!

      @IBAction func textChanged(_ sender: UITextField) {
          if sender.hasText {
             switch sender {
             case textField1:
                textField2.becomeFirstResponder()
             case textField2:
                textField3.becomeFirstResponder()
             case textField3:
                textField4.becomeFirstResponder()
             default:
                sender.resignFirstResponder()
             }
          }
      }

  }