iOS 输入验证码或密码,自动下一位的实例

系统没有textFeild 的相关当输入内容改变时候的代理方法。。。所以我们自己加一个监听来实现如下的效果

自动跳转下一位

主要代码如下：

[_code1F becomeFirstResponder];
  [_code1F addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];
  [_code2F addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];
  [_code3F addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];
  [_code4F addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];
  [_code5F addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];
  [_code6F addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];

-(void)textFieldDidChange :(UITextField *)textField{
  if (textField.text.length == 1) {
    if (textField == _code1F) {
      [_code2F becomeFirstResponder];
    }else if (textField == _code2F){
      [_code3F becomeFirstResponder];
    }else if (textField == _code3F){
      [_code4F becomeFirstResponder];
    }else if (textField == _code4F){
      [_code5F becomeFirstResponder];
    }else if (textField == _code5F){
      [_code6F becomeFirstResponder];
    }else{
      [self.view endEditing:YES];
    }
  }
}