Iphone NSUSERDefaults类是否有问题？

嗨， 在我的代码中，我无法为key first\u name\u textfield设置此值字符串。

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为什么会这样？

我使用此代码使用NSUserDefaults保存和检索值。因此，请参考此，它将帮助您

NSString *string = @"Hardwork";
NSUserDefaults* defs111 = [NSUserDefaults standardUserDefaults]; 
[defs111 setObject:string forKey:@"first_name_textfield"]; 

谢谢

    IBOutlet UITextField * username;
    IBOutlet UITextField * password;

    NSString *userNameString;
    NSString *passWordString;  

    userNameString = [[NSString alloc] initWithFormat:[username text]];
    [username setText:userNameString];

    NSUserDefaults *usernamedefaults = [NSUserDefaults standardUserDefaults];
    [usernamedefaults setObject:userNameString forKey:@"StringKey"];

   passWordString = [[NSString alloc] initWithFormat:[password text]];
    [password setText:passWordString];

    NSUserDefaults *passworddefaults = [NSUserDefaults standardUserDefaults];
    [passworddefaults setObject:passWordString forKey:@"StringKey1"];