iOS - completion block in UIView animateWithDuration gets called too early

Question

I\'m trying to do some animation when a table view cell gets selected. For some reason, the completion block is getting called way too early. Even setting the duration to 10

Answer 1

Yes. It is being called too early because it's being interrupted somehow. Probably by a modal presentation transition or perhaps something else. Depending on your needs, the following may be a solution you like. We avoid the conflict by manually delaying the execution of our animation code like so:

// To get this in Xcode very easily start typing, "dispatch_aft..."

// Note the "0.2". This ensures the outstanding animation gets completed before we start ours
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
    [UIView animateWithDuration:1.0 delay:0 options:0 animations:^{
        // Your animation code
    } completion:^(BOOL finished) {
        // Your completion code
    }];
});