ios - 按下键盘上的键后如何验证文本字段

Question

我有 3 个文本字段

txtField1
txtField2
txtField3

用户需要使用键盘上的 Key(Next) 转到下一个文本字段

要求:

txtField1 键盘上将有 (Next)-键
txtField2 键盘上将有 (Next) 键
txtField3 键盘上将有 (go)-键

问题:
如何按键盘上的下一个键转到下一个 txtField 并按键盘上的 (Go) 键进行验证，并检查 txtField 是否为空。

My Code :

1. The class conform to UITextFieldDelegate

Class myTestVC : UIViewController, UITextFieldDelegate {}

override fun viewDidLoad() {

  txtField1.delegate = self
  txtField1.tag = 0 
  txtField1.returnKeyType = .next
  txtField1.borderStyle = UITextBorderStyle.none

  txtField2.delegate = self
  txtField2.tag = 1
  txtField2.returnKeyType = .next
  txtField2.borderStyle = UITextBorderStyle.none

  txtField3.delegate = self
  txtField3.tag = 2
  txtField3.returnKeyType = .next
  txtField3.borderStyle = UITextBorderStyle.none

  //- to show the Keyboard 
  txtField1.becomeFirstResponder()


}

2)  How to implement this for the above scenario?

func textFieldShouldReturn( _ textField: UITextField) -> Bool {


}

请帮忙。

谢谢

Answer 1

你可以这样使用:

override func viewDidLoad() {
    super.viewDidLoad()
    txtField1.delegate = self
    txtField1.tag = 0
    txtField1.returnKeyType = .next
    txtField1.borderStyle = UITextBorderStyle.none

    txtField2.delegate = self
    txtField2.tag = 1
    txtField2.returnKeyType = .next
    txtField2.borderStyle = UITextBorderStyle.none

    txtField3.delegate = self
    txtField3.tag = 2
    txtField3.returnKeyType = .go
    txtField3.borderStyle = UITextBorderStyle.none

    //- to show the Keyboard
    txtField1.becomeFirstResponder()
}

func textFieldShouldReturn(_ textField: UITextField) -> Bool
{
    switch textField
    {
        case txtField1:
            txtField2.becomeFirstResponder()
        case txtField2:
            txtField3.becomeFirstResponder()
        default:
            if textField.returnKeyType == .go {
                var txtError = ""
                if(txtField1.text == nil || txtField1.text!.isEmpty) {
                    txtError = "txtField1"
                }
                if(txtField2.text == nil || txtField2.text!.isEmpty) {
                    txtError += "txtField2"
                }
                if(txtField3.text == nil || txtField3.text!.isEmpty) {
                    txtError += "txtField3"
                }

                if txtError.isEmpty {
                    textField.resignFirstResponder()
                } else {
                    let alert = UIAlertController(title: "Alert", message: "\(txtError) are empty", preferredStyle: UIAlertControllerStyle.alert)
                    alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil))
                    self.present(alert, animated: true, completion: nil)
                }
            }
    }
    return true
}