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simple function for running UI Updates (or anything) on main thread for Cocoa. Can be useful if you have a callback you are not sure it always runs on main thread.
void onMainQueue(void(^block)(void)) {
if ([NSThread isMainThread])
dispatch_sync(dispatch_get_main_queue(), block);
//usage example:
- (void)callbackThatIDontKnowWhichThreadIsItRunningOn {
[UIView beginAnimations:nil context:nil];
self.alpha = 0;
[UIView commitAnimations];
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