I've tried every syntax variation that I can, but the completion handler always activates before the end of the animation. I think I'm supposed to replace Bool
with something else?
UIView.transition(with: swipeForPicturesIndicator,
duration: 1,
options: .curveEaseIn,
animations: {
self.swipeForPicturesIndicator.alpha = 0
},
completion: { (Bool) -> Void in
self.swipeForPicturesIndicator.isHidden = true
self.swipeForPicturesIndicator.alpha = 0.8
})
The Bool
value indicates wether the animation was finished when the completion block was called. If that value is false
it means your animation was interrupted.
You should use probably animate
instead of transition
UIView.animate(withDuration: 1,
delay: 0,
options: .curveEaseIn,
animations: {
self.swipeForPicturesIndicator.alpha = 0
}) { (completed) in
/* Optionally check if animation finished */
self.swipeForPicturesIndicator.isHidden = true
self.swipeForPicturesIndicator.alpha = 0.8
}
Try this
self.swipeForPicturesIndicator.alpha = 0
UIView.transition(with: swipeForPicturesIndicator,
duration: 1,
options: .curveEaseIn,
animations: {
self.swipeForPicturesIndicator.alpha = 0.8
},
completion: nil)
You may want to use animate instead of transition:
UIView.animate(withDuration: 1, delay: 0, options: .curveEaseIn, animations: {
self.swipeForPicturesIndicator.alpha = 0
}) { (success) in
self.swipeForPicturesIndicator.isHidden = true
self.swipeForPicturesIndicator.alpha = 0.8
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.