NSUserDefaults對iPhone SDK中的疑問

Question

我正在將Twitter集成到我的應用中以共享文本。 我的Twitter集成體系結構是我有兩個Button _btnTwitter和_btntwitteLogout ，當用戶成功登錄Twitter時，其名稱將顯示在_btntwitterLogout作為標題。

當用戶點擊_btntwitterLogout它注銷了Twitter並退出了注銷按鈕，並且出現了登錄按鈕。一切正常。但是，當用戶點擊登錄按鈕（ _btnTwitter ）時，Twitter登錄彈出框用於登錄，這就是問題所在面對，當彈出窗口出現時，用戶點擊該彈出窗口的“取消”按鈕，彈出窗口消失，此處退出按鈕中用戶的先前用戶名不變。 我已將用戶默認設置進行檢查。

-(IBAction)_clickbtnTwitter:(id)sender
{
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"Twitter_logged"];
       [_btntwitterLogeout setTitle:nil forState:UIControlStateNormal];
        _btntwitterLogeout.hidden = NO;
        _btnTwitter.hidden=YES;
    if (_engine) return;
    _engine = [[SA_OAuthTwitterEngine alloc] initOAuthWithDelegate: self];
    _engine.consumerKey = kOAuthConsumerKey;
    _engine.consumerSecret = kOAuthConsumerSecret;

    UIViewController *controller = [SA_OAuthTwitterController controllerToEnterCredentialsWithTwitterEngine: _engine delegate: self];

    if (controller) 
        [self presentModalViewController: controller animated: YES];
    else {
        [_engine sendUpdate: [NSString stringWithFormat: @"Already Updated. %@", [NSDate date]]];

    }
}
}

然后注銷代碼

-(IBAction)_clickbtntwitterlogeout:(id)sender
{ 

    [[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"Twitter_logged"];
    crosstwitterimage.hidden = YES;
     [_btntwitterLogeout setTitle:nil forState:UIControlStateNormal];
   _btntwitterLogeout.hidden = YES;
    _btnTwitter.hidden=NO;
    _btnTwittermain.enabled = NO;
    [_engine clearAccessToken];
    [_engine clearsCookies];
    [_engine setClearsCookies:YES];
    [[NSUserDefaults standardUserDefaults] removeObjectForKey:@"authData"];
    [[NSUserDefaults standardUserDefaults]removeObjectForKey:@"authName"];
    NSLog(@"%@",[[NSUserDefaults standardUserDefaults]valueForKey:@"authName"]);
    NSLog(@"%@",[[NSUserDefaults standardUserDefaults]valueForKey:@"authData"]);
   [[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"Twitter_logged"];
    [_engine release];
    _engine=nil;   

    NSHTTPCookie *cookie;
    NSHTTPCookieStorage *storage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    for (cookie in [storage cookies])
    {
        NSString* domainName = [cookie domain];
        NSRange domainRange = [domainName rangeOfString:@"twitter"];
        if(domainRange.length > 0)
        {
            [storage deleteCookie:cookie];

        }
    }

}

在視線中將會出現

BOOL logged = [[NSUserDefaults standardUserDefaults] boolForKey:@"Twitter_logged"];
;
if (logged == YES) {
    _btnTwitter. hidden = YES;
    _btntwitterLogeout.hidden = NO;
    crosstwitterimage.hidden = NO;
    _btnTwittermain.enabled =YES;
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    //Checks if there is a saved User Name    
    if([defaults objectForKey:@"kTwitterUserName"])
    {
        NSString *username = [defaults objectForKey:@"kTwitterUserName"];
        [_btntwitterLogeout setTitle:username forState:UIControlStateNormal];
        crosstwitterimage.hidden = NO;
    }
}
    else
    {
        _btnTwitter. hidden = NO;
        crosstwitterimage.hidden = YES;
        [_btntwitterLogeout setTitle:nil forState:UIControlStateNormal];
        _btnTwittermain.enabled =NO;
        crosstwitterimage.hidden = YES;

    }

但是當我在Twitter的登錄窗口中點擊“取消”按鈕時，如果用戶已經從Twitter注銷，則會返回帶有注銷按鈕的用戶名。 我的代碼有什么問題嗎？ 提前致謝。

編輯

#pragma mark SA_OAuthTwitterEngineDelegate
- (void) storeCachedTwitterOAuthData: (NSString *) data forUsername: (NSString *) username {
    NSUserDefaults          *defaults = [NSUserDefaults standardUserDefaults];

    [defaults setObject: data forKey: @"authData"];
    [defaults synchronize];
}

- (NSString *) cachedTwitterOAuthDataForUsername: (NSString *) username {
    return [[NSUserDefaults standardUserDefaults] objectForKey: @"authData"];
}

    #pragma mark SA_OAuthTwitterControllerDelegate
    - (void) OAuthTwitterController: (SA_OAuthTwitterController *) controller authenticatedWithUsername: (NSString *) username {
        NSLog(@"Authenicated for %@", username);
        [_btntwitterLogeout setTitle:username forState:UIControlStateNormal];
        NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
        [defaults setObject:username forKey:@"kTwitterUserName"];
        [defaults synchronize];
        }

    - (void) OAuthTwitterControllerFailed: (SA_OAuthTwitterController *) controller {
        NSLog(@"Authentication Failed!");
    }

    - (void) OAuthTwitterControllerCanceled: (SA_OAuthTwitterController *) controller {
        NSLog(@"Authentication Canceled.");
    }


    #pragma mark TwitterEngineDelegate
    - (void) requestSucceeded: (NSString *) requestIdentifier {
        NSLog(@"Request %@ succeeded", requestIdentifier);
    }

    - (void) requestFailed: (NSString *) requestIdentifier withError: (NSError *) error {
        NSLog(@"Request %@ failed with error: %@", requestIdentifier, error);
    }

Answer 1

是的，有問題。 每當您點擊_btnTwitter時 ，您都將Twitter_logged設置為yes。 那是不對的。 只有成功登錄后，才應將其設置為yes。 那是當用戶沒有在Twitter登錄窗口上點擊“取消”時。

換句話說，您需要在用戶實際登錄后將Twitter_logged設置為YES，而不是在用戶單擊按鈕_btnTwitter時設置為

似乎SA_OAuthTwitterController具有指向self的委托屬性。 您應該處理該委托方法中設置Twitter_logged YES的代碼。

希望能有所幫助。

編輯：

給定最新代碼，您應該在此處添加NsUserDefaults數據

  - (void) OAuthTwitterController: (SA_OAuthTwitterController *) controller authenticatedWithUsername: (NSString *) username {
    NSLog(@"Authenicated for %@", username);
    [_btntwitterLogeout setTitle:username forState:UIControlStateNormal];
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    [defaults setObject:username forKey:@"kTwitterUserName"];
    [defaults setBool:YES forKey:@"Twitter_logged"]; // Right here - mbh
    [defaults synchronize];
    }