UIView queued animations

UIView+QueuedAnimations.m

@implementation UIView (AnimationQueue)

+ (void)mtd_animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion semaphore:(dispatch_semaphore_t)semaphore {
    dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);

    [self animateWithDuration:duration animations:animations completion:^(BOOL finished) {
        dispatch_semaphore_signal(semaphore);
        if (completion) {
            completion(finished);
        }
    }];
}

@end