objective-c - 发布前xcode自动登录中的Facebook SDK Singleton？

Question

按照 Facebook 教程的指示，我已经让 Facebook SDK 在 APPDelegate 中工作，但是我正在尝试使用单例方法。我发现的每个教程似乎都是针对旧版本的 SDK，但我已经成功地使用了这个 http://indiedevstories.com/2011/08/30/a-facebook-reusable-class/

我有两个问题，第一个发布 here这是第二个:

我想要一个发布到 Facebook 的按钮，但如果用户没有登录，那么他们需要先登录然后发布(无需先按单独的登录按钮)。
我可以正常登录，也可以正常发帖，但是我不能同时进行这两种操作。
如果未登录，post code 会显示登录屏幕，但登录后不会进入 post 屏幕。您必须再次按 post。
如果您尝试登录但已经登录，则不会发生任何事情。
因此，在按钮上，我使用代码登录然后发布，因为如果已经登录，则会跳过登录。
我遇到的问题是在登录代码之后立即运行邮政编码，因此在用户有机会登录之前。这将导致打开 2 个弹出窗口(1 个登录和 1 个显示登录为尚未登录的帖子)。

如何让我的代码等待用户登录，然后再转到代码中的下一行发布？

FacebookHelper.h

@interface FacebookHelper : NSObject <FBSessionDelegate, FBRequestDelegate, FBDialogDelegate, FBLoginDialogDelegate> {
    Facebook *_facebook;
    NSArray *_permissions;
}

@property (nonatomic,strong) Facebook *facebook;

+(FacebookHelper *) sharedInstance;
+(void)fbDidLogin;

#pragma mark - Public Methods
-(BOOL) isFBSessionValid;
-(void) login;
-(void) logout;
-(void) postToWallWithDialogNewHighscore:(int)highscore;

@end

FacebookHelper.m

@implementation FacebookHelper
@synthesize facebook;

#pragma mark -
#pragma mark Singleton Variables
static FacebookHelper *singletonDelegate = nil;

#pragma mark -
#pragma mark Singleton Methods

+(FacebookHelper *)sharedInstance
{
    @synchronized(self) {
        if (singletonDelegate == nil) {
            singletonDelegate = [[self alloc] init]; // Assignment not done here
        }
    }
    return singletonDelegate;
}

-(id)init
{
    self = [super init];
    if (self) {
        _facebook = [[Facebook alloc] initWithAppId:kAppId andDelegate:self];
        // Restore previous session
        NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
        if ([defaults objectForKey:@"FBAccessTokenKey"] && [defaults objectForKey:@"FBExpirationDateKey"]) {
        _facebook.accessToken = [defaults objectForKey:@"FBAccessTokenKey"];
        _facebook.expirationDate = [defaults objectForKey:@"FBExpirationDateKey"];
        }
        //
    }
    return self;
}

+(id)allocWithZone:(NSZone *)zone
{
    @synchronized(self) {
        if (singletonDelegate == nil) {
            singletonDelegate = [super allocWithZone:zone];
            // assignment and return on first allocation
            return singletonDelegate;
        }
    }
    //on subsequent allocation attemps, return nil
    return nil;
}

-(id)copyWithZone:(NSZone *)zone
{
    return self;
}

#pragma mark - Facebook Delegate Methods

-(void)fbDidLogin
{
    NSLog(@"fbDidLogin");
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    [defaults setObject:[_facebook accessToken] forKey:@"FBAccessTokenKey"];
    [defaults setObject:[_facebook expirationDate] forKey:@"FBExpirationDateKey"];
    [defaults synchronize];
}

-(void)fbDidLogout
{
    NSLog(@"fbDidLogout");
    // Remove saved authorisation information if it exists
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    if ([defaults objectForKey:@"FBAccessTokenKey"]) {
        [defaults removeObjectForKey:@"FBAccessTokenKey"];
        [defaults removeObjectForKey:@"FBExpirationDateKey"];
        [defaults synchronize];
    }
}

#pragma mark - Public Methods

-(NSMutableDictionary *) buildPostParamsWithHighScore:(int)highscore
{
    NSString *customMessage = [NSString stringWithFormat:kCustomMessage, highscore, kAppName];
    NSString *postName = kAppName;
    NSString *serverLink = [NSString stringWithFormat:kServerLink];
    NSString *imageSrc = kImageScr;

    //Final params build
    NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                   //@"message", @"message",
                                   imageSrc, @"picture",
                                   serverLink, @"link",
                                   postName, @"name",
                                   @" ", @"caption",
                                   customMessage, @"description",
                                   nil];
    return params;
}

-(BOOL) isFBSessionValid
{
    // Check if there is a valid session
    //_facebook = [[Facebook alloc] initWithAppId:kAppId andDelegate:self];
    _facebook.accessToken = [[NSUserDefaults standardUserDefaults] objectForKey:@"FBAccessTokenKey"];
    _facebook.expirationDate = [[NSUserDefaults standardUserDefaults] objectForKey:@"FBExpirationDateKey"];
    NSLog(@"accessToken=%@ expirationDaate=%@",_facebook.accessToken,_facebook.expirationDate);
    if (![_facebook isSessionValid]) {
        NSLog(@"FacebookHelper isFBSessionValid = NO");
        return NO;
    } else {
        NSLog(@"FacebookHelper isFBSessionValid = YES");
        return YES;
    }

    return NO;
}

-(void) login
{
    NSLog(@"FacebookHelper login");
    _permissions = [NSArray arrayWithObjects:@"publish_stream", nil]; //@"read_stream", @"offline_access"
    [_facebook authorize:_permissions];
}

-(void) logout
{
    [_facebook logout];
}

-(void) postToWallWithDialogNewHighscore:(int)highscore
{
    NSMutableDictionary *params = [self buildPostParamsWithHighScore:highscore];

    NSLog(@"Post Feed");
    [_facebook dialog:@"feed" andParams:params andDelegate:self];
}

@end

按钮 Action :

- (IBAction)facebookTest:(id)sender {
    [[FacebookHelper sharedInstance] login];
    [[FacebookHelper sharedInstance] postToWallWithDialogNewHighscore:123];
}

Answer 1

我已经更新了单例类以将分数发布到 Facebook Wall。查看新版本:http://indiedevstories.com/2012/04/11/facebookscorer-post-highscores-to-users-facebook-wall/

当需要授权和登录时，这个新版本可以正确处理内部状态。

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