I have a UIImageView that I wish to animate at the click of a button. But before the animation, I set its image. However, this image-setting messes up the animation. When I comment out the image-set, the animation works as expected.
var busFrame = self.newBusView.frame
let sourceFrame = self.buttonA.superview?.convert(self.buttonA.frame.origin, to: nil)
busFrame.origin.y = sourceFrame!.y
busFrame.origin.x = sourceFrame!.x
self.newBusView.frame = busFrame
//the following line messes up the animation
// self.newBusView.image = UIImage(named: "back_blue")
UIView.animate(withDuration: 2.0, delay: 0.3, options: .curveEaseOut, animations: {
busFrame = self.newBusView.frame
let desstinationFrame = self.buttonD.superview?.convert(self.buttonD.frame.origin, to: nil)
busFrame.origin.y = desstinationFrame!.y
busFrame.origin.x = desstinationFrame!.x
self.newBusView.frame = busFrame
}, completion: { finished in
print("Done!")
//same thing happening here
//self.newBusView.image = UIImage(named: "Background 1")
})
Also note that the buttons are in separate Stack views (hence the need for superview?.convert)
UPDATE:
So it was noticed that whenever I have a button.setImage() the positions go wrong (Even if the button has nothing to do with the animation). But instead of setImage, if I use button.imageView.image = something, then it has no side effects on animations. What is happening?
Expected:
Actual:
As we do not know the "expected" animation, I could not repeat the problem that you have. When I set same image again in the commented line, I get the same animation.
It may be about the area that the image covers. New image's ratio may be different than the default, therefore you see different animation although view's animation is same. You actually animate the view. Hence, you should focus on frames.
I believe that as #musakokcen mentioned your image have different size.
Try to use:
yourImageView.layer.masksToBounds = yes
Related
Swift 3, iOS 10, macOS 10.12.4
I am building an app that runs on both iOS and Mac. On the iOS side, I have successfully animated a UIView. When the user taps on something, a popup appears and animates into position. Here's my code inside the tap event:
self.popupConstraintX.constant = x
self.popupConstraintY.constant = y
UIView.animate(withDuration: 0.25 , delay: 0.0, options: .curveLinear, animations: {
self.graphPopup.alpha = 1.0
self.layoutIfNeeded()
}, completion:nil)
In this case, self refers to a UITableViewCell that holds the graphPopup.
I have built the same thing on the Mac side, but I'm trying to animate graphPopup which is now an NSView. Here's what I have so far inside my click event:
self.popupConstraintX.constant = x
self.popupConstraintY.constant = y
self.view.layoutSubtreeIfNeeded()
NSAnimationContext.runAnimationGroup({_ in
self.graphPopup.alphaValue = 1.0
//Indicate the duration of the animation
NSAnimationContext.current().duration = 0.25
NSAnimationContext.current().allowsImplicitAnimation = true
self.view.updateConstraints()
self.view.layoutSubtreeIfNeeded()
}, completionHandler:nil)
Here self refers to the containing NSViewController. Nothing animates--not the position or the alpha of graphPopup. It just appears and disappears like it's on an Atari in 1985.
Any idea what I'm doing wrong with my NSView animation?
Update
For posterity's sake, here is the working code as suggested by BJ (with a slight tweak to use the implicit animation context):
self.popupConstraintX.constant = x
self.popupConstraintY.constant = y
NSAnimationContext.runAnimationGroup({context in
context.duration = 0.25
context.allowsImplicitAnimation = true
self.graphPopup.alphaValue = 1.0
self.view.layoutSubtreeIfNeeded()
}, completionHandler:nil)
The modification of alphaValue is happening before you have turned on implicit animation, so the alpha will not be animated. It's unclear to me whether that was intentional or not.
The view is not animating to the position given by the popupConstraints, because you're not actually doing anything inside the animation block that would cause the view's frame to change. In order to trigger an implicit animation, you must not only update constraints; you must also ensure that the view's frame changes within the animation block. If you're using AutoLayout, this is usually done by calling layoutSubtreeIfNeeded.
However, because you updated the constraints and called layoutSubtreeIfNeeded() prior to the animation block, there are no additional frame changes left to make inside the block (unless there's something happening down in updateConstraints() which you haven't shown us.)
You should remove the first call to layoutSubtreeIfNeeded(), or if it's still necessary, put it above the popupConstraint modifications. Then, when you call layoutSubtreeIfNeeded() within the animation block, a new frame will be set based on those changed constraints, and you should see animation happening.
Swift 5
animator() is the key.
You can simply do like this:
NSAnimationContext.runAnimationGroup({ context in
//Indicate the duration of the animation
context.duration = 0.25
self.popupConstraintX.animator().constant = x
self.popupConstraintY.animator().constant = y
self.graphPopup.animator().alphaValue = 1.0
}, completionHandler:nil)
I'm trying to animate transform from '+' button to 'X' button by rotating it on click.
Everything works great when I'm using standard button on UIView. I'm using following code:
UIView.animateWithDuration(2.0, delay: 0.0, options: .CurveEaseOut, animations: {
let transform = CGAffineTransformMakeRotation(CGFloat(M_PI_4))
self.navigationPlusButton.transform = transform
}, completion: nil)
The problem occurs when I try to achieve the same with button in navigation bar.
Looks like button height is resized to 0 before the rotation and I don't know how to fix navigation button size since there are no constraints definitions. Note storyboard
and for constraints
Note: Second approach using CABasicAnimation rotated button nicely but it returned it to initial state immediately after animation ends. I would like to stay 'X' until I click again.
let rotateAnimation = CABasicAnimation(keyPath: "transform.rotation")
rotateAnimation.fromValue = 0.0
rotateAnimation.toValue = CGFloat(M_PI_4)
rotateAnimation.duration = 2.0
self.navigationPlusButton.layer.addAnimation(rotateAnimation, forKey: nil)
How it works so easily outside the navigation bar and it is so hard to do it on navigation bar? I can't find the solution. Please help
try following lines to your code, it will solve your problem.
rotateAnimation.fillMode = kCAFillModeForwards
rotateAnimation.removedOnCompletion = false
Try this line on the CABasicAnimation:
rotateAnimation.removedOnCompletion = false
It may solve your problem.
I am using a curl up animation when swiping up, which makes a card fly away to the top - it works fine. I'd like to use the same animation, but to swipe down, so that the card flies away down. I guess I'd have to somehow turn the swipe up animation 180 degrees. Is that possible?
let views = (frontView: self.frontView, backView: self.frontView)
// set a transition style
let transitionOptions = UIViewAnimationOptions.TransitionCurlUp
UIView.transitionWithView(self.flashCardView, duration: 0.5, options: transitionOptions, animations: {
views.frontView.removeFromSuperview()
self.flashCardView.addSubview(views.frontView)
}, completion: { finished in
// any code entered here will be applied
})
The UIViewAnimationOptions struct has another option that will solve this for you:
let transitionOptions = UIViewAnimationOptions.TransitionCurlDown
I'm hoping someone may be able to help me understand why my tvOS animations are not running.
In my code I have a function like this:
func testAnimation() {
clockLabel.alpha = 0.0
UIView.animateWithDuration(1.0, animations: {
self.clockLabel.alpha = 1.0
})
}
I am calling testAnimation() from within my viewDidLoad(), but no animation ever seems to happen.
I've tested with a few different types of animations, from things like position to opacity, but it seems that no animation ever actually runs in the Simulator.
At this time, my app does not have a focus. All I'm trying to do is load a blank UIView with a label in the middle that fades in.
You're trying to animate your UILabel before it has been displayed. Move your animation from viewDidLoad() to viewDidAppear().
I can confirm this behaviour as this happens for me as well. What I did was setting a delay of 0.1 (afterDelay:), and it is "good enough"
On the other hand, what DID actually work was setting a transform for my views. E.g. (objc though):
CGAffineTransform scaleTransform = CGAffineTransformMakeScale(0.5,0.5);
[UIView animateWithDuration: 0.5 animations:^{
_myView.transform = scaleTransform;
} completion: nil]
Maybe it's a bug in tvOS
Try using UIView Animation, like this (Swift):
clockLabel.alpha = 0
UIView.animateWithDuration(0.5, delay: 0.0, options: .Linear, animations: {
self.clockLabel.alpha = 1.0
}, completion: { finished in
// you may add some code here to make another action right after the animation end, or just delete this comment :)
})
This works on our side.
I have the following code to animation bounds property of CALayer using CABasicAnimation. But the code doesn't seem to work.
let fromValue = textLabel.layer.bounds
let toValue = CGRectMake(textLabel.layer.bounds.origin.x, textLabel.layer.bounds.origin.y, textLabel.layer.bounds.width, textLabel.layer.bounds.height + 50)
let positionAnimation = CABasicAnimation(keyPath: "bounds")
positionAnimation.fromValue = NSValue(CGRect: fromValue)
positionAnimation.toValue = NSValue(CGRect: toValue)
positionAnimation.duration = 1
positionAnimation.fillMode = kCAFillModeBoth
positionAnimation.removedOnCompletion = false
textLabel.layer.addAnimation(positionAnimation, forKey: "bounds")
Your code does actually work. If you run your code and then switch on View Debugging in Xcode, you will see that the height of the label has increased. The "problem" is that a UILabel in iOS 8 draws itself (its text and its background, if it has one) the same way even after its layer height has been artificially increased in this way. (I believe that this is because the label draws itself with a special clipping region that is based on its text contents.)
To prove this to yourself, try it on a plain vanilla UIView (with a colored background) instead of a label. I've taken the liberty of cleaning up your code (you should never misuse fillMode and removedOnCompletion the way you are doing - it just shows a lack of understand of what animation is):
let fromValue = view2.layer.bounds.height
let toValue = view2.layer.bounds.height + 50
CATransaction.setDisableActions(true)
view2.layer.bounds.size.height = toValue
let positionAnimation = CABasicAnimation(keyPath: "bounds.size.height")
positionAnimation.fromValue = fromValue
positionAnimation.toValue = toValue
positionAnimation.duration = 1
view2.layer.addAnimation(positionAnimation, forKey: "bounds")
You will see that that works perfectly. Now change view2 back to textLabel throughout. It still works, it's just that there is nothing to see.
Another way to prove this to yourself is to drop the whole animation and just change the label's layer height:
self.textLabel.layer.bounds.size.height += 50
You will not see anything happen. So there is no bug in your animation; it's all about the way labels are drawn.
You can make the change visible by changing the view instead of the layer:
self.textLabel.bounds.size.height += 50
One additional "problem", though, is that the animation is not animating. Again this is because labels are drawn in a special way.
So whatever it is you're trying to accomplish it, you'll have to do it in a different way. You might have a clear label in front of a colored view and animate the change in height of the view; we've already proven that that works.