Preventing UICollectionViewCell animated appearance when presenting UICollectionView

Question

When a user does some action, I need to pull a UICollectionView from the bottom up to a certain height. Since that new state is totally optional, the collection

Answer 1

I've been in this problem for around 3 days and finally got a solution. Simply I added the animation block to be called after a very tiny timer

UIView.animateWithDuration(0.5, delay: 0, usingSpringWithDamping: 0.5, initialSpringVelocity: 7 , options: .CurveEaseInOut, animations: {
            self.view.layoutIfNeeded()
        }){ _ in}

will be

let delayTime = dispatch_time(DISPATCH_TIME_NOW, Int64(0.1 * Double(NSEC_PER_SEC)))
    dispatch_after(delayTime, dispatch_get_main_queue()) {
        self.changeConstraint()
    }

private func changeConstraint(){

        UIView.animateWithDuration(0.5, delay: 0, usingSpringWithDamping: 0.5, initialSpringVelocity: 7 , options: .CurveEaseInOut, animations: {
            self.view.layoutIfNeeded()
        }){ _ in}
}

See the magic :)