Not all content is animated inside a stack view when hiding it - ios

Question

I'm currently working on a iOS (swift 3) app. I have a simple vertical stack view containing 2 horizontal stack views. In some cases I want to hide the bottom one. I do so by using the following code
UIView.animate(withDuration: 3) {
self.bottomStackView.isHidden = true;
};
The animation shown below doesn't really do what I would expect:
While the border of the buttons is animated properly when hiding, the text inside each button doesn't seem to be affected until the very end. Any idea as to how I could fix this?

Answer 1

I kept doing some research on the subject, and it seems like most articles were suggesting that using stacks to perform animation would work fine. However I have also found that animations would only work with animatable properties, isHidden not being one of them.
In the end after some trial and errors I have found that isHidden can be animated with stack views, but you can expect children to misbehave. So far the only workaround I have found is like so:
let duration = 0.5;
let delay = 0;
UIView.animate(withDuration: duration, delay: delay, animations: {
self.bottomStack.isHidden = self.hideBottomStack;
})
UIView.animate(withDuration: duration/2, delay: delay, animations: {
self.bottomStack.alpha = 0;
})
You'll note here that I basically "turn" the alpha property down to 0 in half the time I take to hide the stack. This has the effect to hide the text before it overlaps with the upper stack. Also note that I could also have decided to do something like this:
UIView.animate(withDuration: duration, delay: delay, animations: {
self.bottomStack.alpha = 0;
}, completion: { (_) in
self.bottomStack.isHidden = true;
})
This would also hide the bottom stack, but you lose the hiding motion in favor of a fading motion and hide the stack once the fading is done.

Answer 2

I'm not sure about this, I think stackviews can cause weird behaviour sometimes. Have you tried adding "self.view.layoutIfNeeded()" inside the UIView.animate block? Like this:
UIView.animate(withDuration: 3) {
self.bottomStackView.isHidden = true
self.view.layoutIfNeeded()
}
I think it should also work if you put the "self.bottomStackView.isHidden = true" above the UIView.animate, not sure though, not an expert at it.
Also, I don't think you need to use ";" after your line of code in swift :)