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我已经在我的 iOS 应用程序中集成了 CocoaLibSpotify，我正在开发用户登录。第一次显示登录控制器，如果登录成功，将生成用户凭据并将其存储在 NSDefaults 中，正如 Rich Able 在SPLoginViewController 中解释的那样记住凭据：

代码如下：

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSMutableDictionary *storedCredentials = [defaults valueForKey:@"SpotifyUsers"];

if (storedCredentials == nil)
    [self performSelector:@selector(showLogin) withObject:nil afterDelay:0.0];
else
{
    NSString *u = [storedCredentials objectForKey:@"LastUser"] ;
    [[SPSession sharedSession] attemptLoginWithUserName:u existingCredential:    [storedCredentials objectForKey:u]];
}

-(void)session:(SPSession *)aSession didGenerateLoginCredentials:(NSString *)credential     forUserName:(NSString *)userName
{
    NSLog(@"stored credentials");
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    NSMutableDictionary *storedCredentials = [[defaults valueForKey:@"SpotifyUsers"] mutableCopy];

    if (storedCredentials == nil)
        storedCredentials = [NSMutableDictionary dictionary];

    [storedCredentials setValue:credential forKey:userName];
    [storedCredentials setValue:userName forKey:@"LastUser"];
    [defaults setValue:storedCredentials forKey:@"SpotifyUsers"];
    [defaults synchronize];
}

但是，当我关闭应用程序并重新启动它时，我尝试使用存储的凭据登录，但登录总是失败。

这是否可以实现，或者当我重新启动应用程序时，会话变得无效并且我需要要求用户再次登录？

提前致谢！

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