IOS 键盘调用 UITExtFieldDelegate

键盘 UITextFiledDelegate

 self.mobile.returnKeyType=UIReturnKeyDone;//设置类型
  
 [self.mobile becomeFirstResponder];//弹出键盘

-(BOOL)textFieldShouldReturn:(UITextField *)textField{
   if(textField==self.mobile){
        [self.password becomeFirstResponder];//换行 但不关闭键盘
    }else{
        //关闭键盘
        [textField resignFirstResponder];
        [self login:nil];

    }
    return YES;
}