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ViewsUIStackView - hide and collapse subview with animation
I'm trying to hide UIStackView's subview like this:
UIViewPropertyAnimator.runningPropertyAnimator(withDuration: 2.0,
delay: 0, options: [.curveEaseOut], animations: {
self.label.isHidden = true
self.label.alpha = 0.0
self.stackView.layoutIfNeeded()
})
However, the label disappears instantly with using this code. I suspect this is because of setting isHidden to true, which is required for collapsing.
Is there a way how to hide and collapse UIStackView's subvew with animation? Or it might be better to not to use UIStackView at all?
3 answers
Answer question0
According to Apple's documentation:
You can animate both changes to the arranged subview’s isHidden property and changes to the stack view’s properties by placing these changes inside an animation block.
I've tested the below code using iOS 12.1 Simulator and it works as expected.
UIView.animate(
withDuration: 2.0,
delay: 0.0,
options: [.curveEaseOut],
animations: {
self.label.isHidden = true
self.label.alpha = 0.0
})
0
You can animate view properties like alpha, color, etc. However, some things happen instantly - isHidden in this case.
Here's an example using UIView.animate:
UIView.animate(withDuration: 2, delay: 0, options: .curveEaseOut, animations: {
self.label.alpha = 0 // Changes the label's layer alpha value
}, completion: { finished in
self.label.isHidden = true // Hides the label
self.label.layer.alpha = 1 // Resets the label's alpha without un-hiding it
})
Using UIViewPropertyAnimator:
UIViewPropertyAnimator.runningPropertyAnimator(withDuration: 2, delay: 0, options: .curveEaseOut, animations: {
self.label.alpha = 0 // Sets the label's alpha
}) { _ in
self.label.isHidden = true // Hides the label
self.label.alpha = 1 // Resets the label's alpha without un-hiding it
}
0
I have tried your code. Its animating
if self.stackView.subviews.count > 0 {
UIViewPropertyAnimator.runningPropertyAnimator(withDuration: 1.0, delay: 0, options: [.curveEaseOut], animations: {
self.stackView.subviews[0].isHidden = true
self.stackView.subviews[0].alpha = 0.0
self.stackView.layoutIfNeeded()
}) { (position) in
self.stackView.subviews[0].removeFromSuperview()
}
}
