Synchronise all animations on collection-view cells - objective-c

Question

I am working on a project where I need to animate certain collection view cell background color to a flashing state. I am using the code below on my collectionviewcell subclass:
- (void) fadeInAnimation{
if (!self.animationRunning) {
if ([self canRunAnimation]) {
typeof(self) __weak weakSelf = self;
self.nameLabel.textColor = [UIColor blackColor];
self.animationRunning = true;
[UIView animateWithDuration:1.0
delay:0.0
options: UIViewAnimationOptionCurveEaseIn | UIViewAnimationOptionAllowUserInteraction animations:^{
self.backgroundColor = [self.backgroundColor colorWithAlphaComponent:1.0];
}
completion:^(BOOL finished) {
[weakSelf fadeOutAnimation];
}];
}
else {
[self.layer removeAllAnimations];
self.backgroundColor = [self.backgroundColor colorWithAlphaComponent:1.0];
}
}
}
- (void) fadeOutAnimation {
typeof(self) __weak weakSelf = self;
[UIView animateWithDuration:1.0
delay:0.0
options:UIViewAnimationOptionCurveEaseIn | UIViewAnimationOptionAllowUserInteraction animations:^{
self.backgroundColor = [self.backgroundColor colorWithAlphaComponent:0.65];
}
completion:^(BOOL finished) {
weakSelf.animationRunning = NO;
[weakSelf fadeInAnimation];
}];
}
My problem is that even though this code works, I think it is not very efficient and needs cleaning up. Also what I need, is that, all animations currently running should be synchronised in flashing however my code makes cells fade in and out in different times. I have a refresh method that refreshes UI based on the results on my API call every few seconds. Any ideas how I could synchronise currently running UIAnimations? I hope I have been clear in my question.

Answer 1

I fixed my problem by going through my view's subviews and capturing all collectionview cells on my multiple subviews and once I had them, I set their background color with alpha component gradually.. here's part of my solution inspired by Armand's answer in this question:
Animation UITableViewCell backgroundcolor
- (void) animateCellFromView:(UIView*)subview {
if ([subview isKindOfClass:[PageCollectionItemCell class]]) {
PageCollectionItemCell *cell = (PageCollectionItemCell*)subview;
if ([cell canRunAnimation]) {
cell.backgroundColor = [cell.backgroundColor colorWithAlphaComponent:self.alpha];
}
}
}