You cannot call FB.login from the callback of FB.getLoginStatus. Browsers tend to block popup windows of the popup is not spawned as an immediate result of a user’s click action. Because FB.getLoginStatus does an ajax call and you call FB.login on it’s response, the popup that would open as a result of this call is … Read more
Below is a full example. In your subclass, after your async method completes, call [self completeOperation] to transition to the finished state. @interface AsynchronousOperation() // ‘executing’ and ‘finished’ exist in NSOperation, but are readonly @property (atomic, assign) BOOL _executing; @property (atomic, assign) BOOL _finished; @end @implementation AsynchronousOperation – (void) start; { if ([self isCancelled]) { … Read more