How to move cursor from one text field to another automatically in swift ios programmatically?

Question

    func textFieldDidBeginEditing(textField: UITextField) {
    scrlView.setContentOffset(CGPointMake(0, textField.frame.origin.y-70), animated: true)


    if(textF         


        

Answer 1

Objective c and Swift 4.2 to move the cursor from one field to another automatically in OTP(One Time Password) fields

Here i am taking one view controller ]1

Then give the Tag values for each TextFiled.Those related reference images are shown below

Enter tag value for first textfiled --> 1,2ndTextfiled ---->2,3rd TextFiled --->3 4rth TextFiled---->4

Then assign Textfiled Delegates and write below code and see the magic

 - (BOOL)textField:(UITextField *)textField 
shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString 
 *)string
 {
 if ((textField.text.length < 1) && (string.length > 0))
 {
    NSInteger nextTag = textField.tag + 1;
    UIResponder* nextResponder = [textField.superview 
  viewWithTag:nextTag];
    if (! nextResponder){
        [textField resignFirstResponder];
    }
    textField.text = string;
    if (nextResponder)
        [nextResponder becomeFirstResponder];
    return NO;

 }else if ((textField.text.length >= 1) && (string.length == 0)){
    // on deleteing value from Textfield

    NSInteger prevTag = textField.tag - 1;
    // Try to find prev responder
    UIResponder* prevResponder = [textField.superview 
 viewWithTag:prevTag];
    if (! prevResponder){
        [textField resignFirstResponder];
    }
    textField.text = string;
    if (prevResponder)
        // Found next responder, so set it.
        [prevResponder becomeFirstResponder];

    return NO;
}
return YES;

}

swift4.2 version code

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {



    if textField.text!.count < 1 && string.count > 0 {
        let tag = textField.tag + 1;
        let nextResponder = textField.superview?.viewWithTag(tag)

        if   (nextResponder != nil){
            textField.resignFirstResponder()

        }
        textField.text = string;
        if (nextResponder != nil){
            nextResponder?.becomeFirstResponder()

        }
        return false;


    }else if (textField.text?.count)! >= 1 && string.count == 0 {
        let prevTag = textField.tag - 1
        let prevResponser = textField.superview?.viewWithTag(prevTag)
          if (prevResponser != nil){
            textField.resignFirstResponder()
        }
        textField.text = string
        if (prevResponser != nil){
            prevResponser?.becomeFirstResponder()

        }
         return false
    }


    return true;

}