Why restrain a subview from animation? Why not simply carry out its layout changes after the animation?
That's logical but not feasible considering my view hierarchy and this particular use-case.
My view hierarchy:
MyViewController: UIViewController -> MyCustomView: UIView -> MyCustomScrollView: UIScrollView, UIScrollViewDelegate, UICollectionViewDelegate, UICollectionViewDataSource
Why is it not possible?:
1) I do this in MyViewController after various constraint changes:
UIView.animate(withDuration: 0.3, animations: {
self.view.layoutIfNeeded()
})
2) Since MyCustomView is a subview which contains MyCustomScrollView (which in turn contains a UICollectionView as its subview), the layout update triggers CV's willDisplay delegate method under which I'm adding a bunch of labels to MyCustomView, to be precise.
Here's the function in MyCustomView that I'm calling:
func addLabel(forIndexPath indexPath: IndexPath) {
var label: UILabel!
label.frame = Util.labelFrame(forIndex: indexPath, fillWidth: false) // The frame for the label is generated here!
//Will assign text and font to the label which are unnecessary to this context
self.anotherSubView.addSubview(label) //Add the label to MyCustomView's subview
}
3) Since these changes get caught up within the animation block from point 1, I get some unnecessary, undesired animations happening. And so, MyCustomView's layout change is bound with this animation block, forcing me to look for a way to restrain this from happening
Things tried so far:
1) Tried the wrap the addSubView() from addLabel(forIndexPath:) inside a UIView.performWithoutAnimation {} block. - No luck
2) Tried the wrap the addSubView() from addLabel(forIndexPath:) inside another animation block with 0.0 seconds time as to see if this overrides the parent animation block - No luck
3) Explored UIView.setAnimationsEnabled(enabled:) but it seems like this won't cancel/pause the existing animators, and will completely disable all the animations if true (which is not what I want)
To sum this all up, my problem is:
I need to restrain the animations on MyCustomView but I need all my other desired layout changes to take place. Is this even possible? Would really appreciate a hint or a solution, TYIA!
Thanks to this answer, removing all the animations from anotherSubview's layer(inside the addLabel(forIndexPath:)) after adding the label:
self.anotherSubview.addSubview(label)
self.anotherSubview.layer.removeAllAnimations() //Doing this removes the animations queued to animate the label's frame into the view
does exactly what I want!