小编Has*_*tab的帖子

我正在尝试使用Facebook功能实现登录,但我收到了以下错误.

登录失败,错误:无法完成操作.(com.facebook.sdk.login错误304.)

这是我的代码

    - (void)loginWithFacebook {
        NSString *const read_actions = @"email";

        [[[FBSDKLoginManager alloc] init]
         logInWithReadPermissions:@[read_actions] handler:^(FBSDKLoginManagerLoginResult *result, NSError *error)
         {
             if (error) {
                 NSLog(@"Login Failed with error: %@", error.localizedDescription);
             }
             else if (result.isCancelled)
             {
                 NSLog(@"Login Failed due to Cancel");
             }
             else
             {
                 if ([result.grantedPermissions containsObject:read_actions]) {
                     NSLog(@"Permission granted");

                 }
             }
         }];
    }