如何更改键盘的DONE按钮,iPhone

Question

我有2个文本字段,用于登录ID和密码.当用户点击电子邮件ID时,他们的键盘类型是电子邮件,密码是其默认值.他们完成了两个键盘按钮,解开了键盘.我想要做的是,一旦用户填写了id和密码,他们的DONE按钮应该更改为"LOGIN",我可以在它上面执行选择器方法登录.

这可行吗？

谢谢

Answer 1

如果您使用的是标准iOS键盘,那么唯一可用的返回键类型是

typedef enum {
    UIReturnKeyDefault,         // “Return”
    UIReturnKeyGo,              // “Go”
    UIReturnKeyGoogle,          // “Google”.
    UIReturnKeyJoin,            // “Join”.
    UIReturnKeyNext,            // “Next”.
    UIReturnKeyRoute,           // “Route”.
    UIReturnKeySearch,          // “Search”.
    UIReturnKeySend,            // “Send”.
    UIReturnKeyYahoo,           // “Yahoo”.
    UIReturnKeyDone,            // “Done”
    UIReturnKeyEmergencyCall,   // "Emergency Call”.
} UIReturnKeyType;

要检测键盘上的键更改,您可以注册名称:UITextFieldTextDidChangeNotification.让我们说你的textfield是emailTextField和passwordTextField.

首先注册通知,检测文本输入

// emailTextField
[[NSNotificationCenter defaultCenter] addObserver:self 
                                         selector:@selector(check)
                                             name:UITextFieldTextDidChangeNotification
                                           object:emailTextField];

// passwordTextField
[[NSNotificationCenter defaultCenter] addObserver:self 
                                         selector:@selector(check)
                                             name:UITextFieldTextDidChangeNotification
                                           object:passwordTextField];

- (void)check {
  if ([emailTextField.text length] > 0 && [passwordTextField.text length] > 0) {
     // Set the return key here, e.g:
     emailTextField.returnKeyType = UIReturnKeyGo;
     passwordTextField.returnKeyType = UIReturnKeyGo;
  }
  else {
     // Set the return key here, e.g: 
     emailTextField.returnKeyType = UIReturnKeyNext;
     passwordTextField.returnKeyType = UIReturnKeyNext;
  }
}

当点击返回键时,它将调用textfield delegate.你可以这样做:

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    // You can perform selector here, probably after checking if both of the textfields already filled   out. E.g:
    if ([emailTextField.text length] > 0 && [passwordTextField.text length] > 0) {
        [self performSelector:@selector(login)];
    }

    return YES;
}