ios - 串行调度队列不等待

Question

我需要使用我的应用程序登录 Facebook，获取一些数据，完成后，还要登录 Firebase。我正在为此使用调度队列，但它不起作用。我的 block 根本不等待彼此完成。

这是我的代码:

dispatch_queue_t loginQueue = dispatch_queue_create("com.balazsvincze.loginQueue", DISPATCH_QUEUE_SERIAL);


//Log in to Facebook
    dispatch_async(loginQueue, ^{
        FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init];
        [login logInWithReadPermissions: @[@"public_profile",@"user_friends"] fromViewController:viewController handler:^(FBSDKLoginManagerLoginResult *result, NSError *error) {

            if(!error){
                NSLog(@"Logged into Facebook");
                self.facebookUserID = [[FBSDKAccessToken currentAccessToken] userID];

                //Load my profile
                [FBSDKProfile loadCurrentProfileWithCompletion:^(FBSDKProfile *profile, NSError *error){
                    if(!error){
                        self.name = profile.name;
                    }

                    else{
                        NSLog(@"Could not load profile: %@",error);
                        completionResult(NO);
                        return;
                    }

                }];
            }

            else{
                NSLog(@"Could not login: %@",error);
                completionResult(NO);
                return;
            }

        }];
    });

    //Log in to Firebase
    dispatch_async(loginQueue, ^{
        FIRAuthCredential *credential = [FIRFacebookAuthProvider credentialWithAccessToken:[FBSDKAccessToken currentAccessToken].tokenString];

        [[FIRAuth auth] signInWithCredential:credential  completion:^(FIRUser *user, NSError *error) {

            if(!error){
                NSLog(@"Logged into Firebase");
                self.firebaseUserID = user.uid;
            }

            else{
                NSLog(@"Could not login: %@",error);
                completionResult(NO);
                return;
            }
        }];
    });

有什么想法吗？谢谢!

Answer 1

在 Facebook 的完成处理程序中调用 Firebase 登录，一切都会按预期工作