Upvote:1
Aprove answer
// This causes the queue to block; -- FAILURE CASE
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 0.4 * NSEC_PER_SEC), dispatch_get_main_queue(), ^
{
[ self longRunningOp ];
});
// This keeps the queue running;!!!!! - SUCCESS CASE
[ self performSelector:@selector(longRunningOp) withObject:nil afterDelay:0.4 ];
Upvote:4
__CFRunLoopRun
CFRunLoopRunSpecific
-[NSRunLoop(NSRunLoop) runMode:beforeDate:]
-[ViewController viewDidAppear:]
-[UIViewController _setViewAppearState:isAnimating:]
-[UIViewController _endAppearanceTransition:]
-[UINavigationController navigationTransitionView:didEndTransition:fromView:toView:]
__49-[UINavigationController _startCustomTransition:]_block_invoke
-[_UIViewControllerTransitionContext completeTransition:]
__53-[_UINavigationParallaxTransition animateTransition:]_block_invoke95
-[UIViewAnimationBlockDelegate _didEndBlockAnimation:finished:context:]
-[UIViewAnimationState sendDelegateAnimationDidStop:finished:]
-[UIViewAnimationState animationDidStop:finished:]
CA::Layer::run_animation_callbacks(void*)
_dispatch_client_callout
_dispatch_main_queue_callback_4CF
__CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__
__CFRunLoopRun
CFRunLoopRunSpecific
GSEventRunModal
UIApplicationMain
main
start
Credit Goes to: stackoverflow.com
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