I try to animate an UILabel:
let label: UILabel = UILabel()
var transform = CGAffineTransform.identity
UIView.animate(withDuration: 2, animations: {
self.transform = self.transform.translatedBy(x: 0, y: -150)
self.transform = self.transform.scaledBy(x: 2, y: 2)
self.label.transform = self.transform
})
It works well. I have a button and I added a selector so that when it is pressed, the label animates again:
func performSearch() {
UIView.animate(withDuration: 2, animations: {
self.transform = self.transform.translatedBy(x: 0, y: -300)
self.label.transform = self.transform
})
}
But what it actually does is to scale down the label as in the original state, move it down to the bottom of the screen, then animate, although all I want it to do is to move up. Why?
Transforms can be a little confusing... Because you have scaled the transform, further transforms seem to be "auto-adjusted" by the scaling, but not in a really intuitive or obvious way.
This may help you get further:
// initial animation
UIView.animate(withDuration: 2, animations: {
self.transform = self.transform.translatedBy(x: 0, y: -150)
self.transform = self.transform.scaledBy(x: 2, y: 2)
self.label.transform = self.transform
})
// "resuming" animation
func performSearch() {
let distance: CGFloat = -300 / 2
self.transform = self.transform.translatedBy(x: 0, y: distance)
self.label.transform = self.transform
UIView.animate(withDuration: 2, animations: {
self.transform = self.transform.translatedBy(x: 0, y: distance)
self.label.transform = self.transform
})
}
You can flip the coordinate system to behave like iOS like this...
layer.sublayerTransform = CATransform3DMakeScale(1.0f, -1.0f, 1.0f);
If you want to move it up in performSearch() you need to use a positive y value:
self.transform = self.transform.translatedBy(x: 0, y: 300)
Related
I have an opening book animation: https://streamable.com/n1c0n
And I want to on 90 degrees my image has changed.
I use this code:
var book1ImageViewI : UIImageView
let book2ImageViewI : UIImageView
book1ImageViewI = UIImageView(frame: CGRect( x: self.view.frame.size.width / 2 - 140, y: (self.view.frame.size.height / 2) - ( (self.view.frame.width / 2) / 2 ), width: ( (self.view.frame.width / 2) / 8) * 7, height: self.view.frame.width / 2))
book2ImageViewI = UIImageView(frame: CGRect(x: self.view.frame.size.width / 2 - 140, y: (self.view.frame.size.height / 2) - ( (self.view.frame.width / 2) / 2 ), width: ( (self.view.frame.width / 2) / 8) * 7, height: self.view.frame.width / 2))
book1ImageViewI.image = UIImage(named:"attachment_83090027.jpg")
book2ImageViewI.image = UIImage(named:"0a6752b7cd35fc441c152238ee5078384d--antique-books-rabbit-hole.jpg")
book1ImageViewI.layer.anchorPoint = CGPoint(x: 0, y: 0.5)
book2ImageViewI.layer.anchorPoint = CGPoint(x: 0, y: 0.5)
var transform = CATransform3DIdentity
transform.m34 = 1.0 / -2000.0
book1ImageViewI.layer.transform = transform
UIView.animate(withDuration: 1.5, animations: {
book1ImageViewI.layer.transform = CATransform3DRotate(transform, -.pi/2, 0, 1, 0)
})
{
(bCompleted) in
if (bCompleted) {
book1ImageViewI.layer.transform = CATransform3DRotate(transform, -.pi/2, 0, 1, 0)
}
UIView.animate(withDuration: 1.5, animations: {
book1ImageViewI.layer.transform = CATransform3DRotate(transform, .pi*0.999, 0, 1, 0)
book1ImageViewI.image = UIImage(named:"0a6752b7cd35fc441c1528ee5078384d--antique-books-rabbit-holer.png")
}, completion: {
(bFinished) in
//Whatever
})
}
self.view.addSubview(book2ImageViewI)
self.view.addSubview(book1ImageViewI)
Everything works fine. But on 90 degrees animation slightly delayed.
I want to get animation like this without delay: https://streamable.com/q2bf6
How to do it?
P.S. In second animation use this code:
UIView.animate(withDuration: 3, delay: 0.0,
options: [], animations: {
DispatchQueue.main.asyncAfter(deadline: .now() + 1.5) {
book1ImageViewI.image = UIImage(named:"0a6752b7cd35fc441c1528ee5078384d--antique-books-rabbit-holer.png")
}
book1ImageViewI.layer.transform = CATransform3DRotate(transform, .pi, 0, 1, 0)
self.view.layoutIfNeeded()
}, completion: {_ in
})
But this code does not fit. Because images changes not on 90 degrees. Sometimes earlier. Sometimes later.
Apparently, the anchor-point change was quite crucial wherever rotation transform is involved, and it is not straightforward. Every time you change anchorpoint, it alters the UIView position, and we must compensate for this change somehow.
Here is the final version using imageview which works without interruption for me. Apparently, it works with addKeyFrame API as well but for simplicity's sake I kept UIView.animate().
The trick I used is to have smaller duration for first animation and larger one for the second. It almost look like a page flip. You can also play with UIView.animate overrides that provide for UIViewAnimationOptions - such as curveEaseIn and curveEaseOut to make it look like page flip of a book.
It seems to work for me, the only thing is that you can't say it is rotating from the front or back. If your imageview is slant (like the slant book page you show in video), it should be visible and you can simply correct by changing the - to + sign within CATransform3DRotate arguments, or vice versa in animation block.
NOTE:
If it still plays hide and seek, try on real device instead of simulator just in case. There is apparent difference due to GPU execution when it comes to animations.
func pageFlipAnimation()
{
self.myImageView.image = UIImage.init(named: "firstImage")
var transform = CATransform3DIdentity
let transform1 = CATransform3DRotate(transform, -CGFloat(Double.pi)*0.5, 0, 1, 0)
let transform2 = CATransform3DRotate(transform, -CGFloat(Double.pi), 0, 1, 0)
transform.m34 = 1.0 / -5000.0
self.setAnchorPoint(anchorPoint: CGPoint(x: 0, y: 0.5), forView: self.myImageView)
UIView.animate(withDuration: 0.5, animations:
{
self.myImageView.layer.transform = transform1
})
{
(bFinished) in
self.myImageView.image = UIImage.init(named: "secondImage")
UIView.animate(withDuration: 0.75, animations:
{
self.myImageView.layer.transform = transform2
})
}
}
//This should ideally be a UIView Extension
func setAnchorPoint(anchorPoint: CGPoint, forView view: UIView)
{
var newPoint = CGPoint(x:view.bounds.size.width * anchorPoint.x, y:view.bounds.size.height * anchorPoint.y)
var oldPoint = CGPoint(x:view.bounds.size.width * view.layer.anchorPoint.x, y:view.bounds.size.height * view.layer.anchorPoint.y)
newPoint = newPoint.applying(view.transform)
oldPoint = oldPoint.applying(view.transform)
var position = view.layer.position
position.x -= oldPoint.x
position.x += newPoint.x
position.y -= oldPoint.y
position.y += newPoint.y
view.layer.position = position
view.layer.anchorPoint = anchorPoint
}
This part of your code conflicts:
(bCompleted) in
if (bCompleted) {
book1ImageViewI.layer.transform = CATransform3DRotate(transform, -.pi/2, 0, 1, 0)
}
UIView.animate(withDuration: 1.5, animations: {
book1ImageViewI.layer.transform = CATransform3DRotate(transform, .pi*0.999, 0, 1, 0)
book1ImageViewI.image = UIImage(named:"0a6752b7cd35fc441c1528ee5078384d--antique-books-rabbit-holer.png")
}, completion: {
(bFinished) in
//Whatever
})
You set book1ImageViewI.layer.transform = CATransform3DRotate(transform, -.pi/2, 0, 1, 0) at the same time as book1ImageViewI.layer.transform = CATransform3DRotate(transform, .pi*0.999, 0, 1, 0)
Try this instead:
(bCompleted) in
if (bCompleted) {
UIView.animate(withDuration: 1.5, animations: {
book1ImageViewI.layer.transform = CATransform3DRotate(transform, -.pi/2, 0, 1, 0)
book1ImageViewI.image = UIImage(named:"0a6752b7cd35fc441c1528ee5078384d--antique-books-rabbit-holer.png")
}, completion: {
(bFinished) in
//Whatever
})
}
I have this code to create animation imageView:
imageView.layer.anchorPoint = CGPoint(x: 0, y: 0.5)
var transform = CATransform3DIdentity
transform.m34 = -0.001
imageView.layer.transform = transform
UIView.animate(withDuration: 3) {
self.imageView.layer.transform = CATransform3DRotate(transform, .pi, 0, 1, 0)
self.imageViewCenterConstraintX.constant = 0
self.view.layoutIfNeeded()
}
In this code imageView rotate with 180 degrees. I want to change image after imageView rotate with 90 degrees.
You should chain the two animations, each rotating with pi/2.
imageView.layer.anchorPoint = CGPoint(x: 0, y: 0.5)
var transform = CATransform3DIdentity
transform.m34 = -0.001
imageView.layer.transform = transform
UIView.animate(withDuration: 1.0, animations:
{
self.imageView.layer.transform = CATransform3DRotate(transform, .pi/2, 0, 1, 0)
self.imageViewCenterConstraintX.constant = 0
})
{
(bCompleted) in
if (bCompleted)
{
self.imageView?.layer.transform = CATransform3DRotate(transform, .pi/2, 0, 1, 0)
}
UIView.animate(withDuration: 1.0, animations:
{
self.imageView.layer.transform = CATransform3DRotate(transform, .pi*0.999, 0, 1, 0)
self.imageView.image = UIImage.init(named:"anotherImage")
},
completion:
{
(bFinished) in
//Whatever
})
}
Use the one below. Use code to change image in the completion handler field.
UIView Animation with completion
You could use DispatchQueue.main.asyncAfter.
UIView.animate(withDuration: 3) {
DispatchQueue.main.asyncAfter(deadline: .now() + 1.5) {
// Change your image here
}
self.imageView.layer.transform = CATransform3DRotate(transform, .pi, 0, 1, 0)
self.imageViewCenterConstraintX.constant = 0
self.view.layoutIfNeeded()
}
I have a subclassed imageview that I'd like to fade in, scale up, and rotate, then continue rotating while scaling back down and fading out.
I am using a UIView animate block with a completion handler to handle the shrinking back down.
The problem is it's not a fluid animation. Before the completion handler runs, the animation stops before running again. I need it to be one nice "swoop" of an animation.
Code below:
let duration: TimeInterval = 3.0
let rotate = CGAffineTransform(rotationAngle: CGFloat(Double.pi))
UIView.animate(withDuration: duration * 3, delay: 0, options: [.curveLinear], animations: {
// initial transform
self.alpha = 0
self.transform = CGAffineTransform(scaleX: 0.1, y: 0.1)
// initial spin for duration of animaton
UIView.animate(withDuration: duration * 3, delay: 0.0, options: [.curveLinear], animations: {
self.transform = rotate
}, completion: nil)
// scaling and fading
UIView.animate(withDuration: duration, delay: 0, options: [.curveLinear], animations: {
UIView.setAnimationRepeatCount(3)
self.transform = self.transform.scaledBy(x: 0.8, y: 0.8)
self.alpha = 1
}) { (true) in
UIView.animate(withDuration: duration, animations: {
UIView.setAnimationRepeatCount(3)
self.transform = self.transform.scaledBy(x: 0.1, y: 0.1)
self.alpha = 0
})
}
}, completion: nil)
How can I get the animation to rotate the entire time while fading in and scaling up before scaling back down and fading out? The entire animation should last 3 seconds, and repeat 3 times. Thanks.
For your modified request I am expanding what you already saw using the block animations. As some have said, key frame animations may be better, regardless, here is the thought.
Create an animation that rotates the entire time by transforming the view.
Create another animation that does the scaling and fading based off the current transform (which is rotating). In this pass, I just created some variable to allow you to customize (and repeat) portions of the animation. I broke some things out to be clear and know I could refactor to write thing even more concise.
Here is the code
import UIKit
class OrangeView: UIView {
override func layoutSubviews() {
super.layoutSubviews()
let duration: TimeInterval = 9.0
self.transform = CGAffineTransform.identity
// initial transform
self.alpha = 1
self.transform = CGAffineTransform(scaleX: 0.1, y: 0.1)
// start rotation
rotate(duration: duration)
// scaling and fading
scaleUpAndDown(desiredRepetitions: 3, initalDuration: duration)
}
func rotate(duration: TimeInterval) {
UIView.animate(withDuration: duration/2.0,
delay: 0.0,
options: [.curveLinear], animations: {
let angle = Double.pi
self.transform = self.transform.rotated(by: CGFloat(angle))
}, completion: {[weak self] finished in
guard let strongSelf = self else {
return
}
if finished &&
strongSelf.transform != CGAffineTransform.identity {
strongSelf.rotate(duration: duration)
} else {
// rotation ending
}
})
}
func scaleUpAndDown(timesRepeated: Int = 0, desiredRepetitions: Int, initalDuration: TimeInterval) {
guard timesRepeated < desiredRepetitions,
desiredRepetitions > 0, initalDuration > 0 else {
self.transform = CGAffineTransform.identity
return
}
let repeatedCount = timesRepeated + 1
let scalingDuration = initalDuration/2.0/Double(desiredRepetitions)
UIView.animate(withDuration: scalingDuration,
delay: 0.0,
animations: {
let desiredOriginalScale: CGFloat = 0.8
let scaleX = abs(CGAffineTransform.identity.a / self.transform.a) * desiredOriginalScale
let scaleY = abs(CGAffineTransform.identity.d / self.transform.d) * desiredOriginalScale
self.transform = self.transform.scaledBy(x: scaleX, y: scaleY)
self.alpha = 1
}) { (true) in
UIView.animate(withDuration:scalingDuration,
delay: 0.0,
animations: {
let desiredOriginalScale: CGFloat = 0.1
let scaleX = abs(CGAffineTransform.identity.a / self.transform.a) * desiredOriginalScale
let scaleY = abs(CGAffineTransform.identity.d / self.transform.d) * desiredOriginalScale
self.transform = self.transform.scaledBy(x: scaleX, y: scaleY)
self.alpha = 0
}) { finshed in
self.scaleUpAndDown(timesRepeated: repeatedCount, desiredRepetitions: desiredRepetitions, initalDuration: initalDuration);
}
}
}
}
Finally here is another animated gif
I see the slight stutter in rotation at the start of the onCompletion.
I created a reduction with your code (shown below in the Blue View) and a variation in the Orange View. This was taken from the simulator and turned into an animated GIF, so speed is slowed down. The Orange View continues to spin as the complete transform just scales down.
This is the code for the layoutSubviews() for the Orange View
override func layoutSubviews() {
super.layoutSubviews()
let duration: TimeInterval = 3.0
let rotate = CGAffineTransform(rotationAngle: CGFloat(Double.pi))
// initial transform
self.alpha = 0
self.transform = CGAffineTransform(scaleX: 0.1, y: 0.1)
// initial spin for duration of animaton
UIView.animate(withDuration: duration,
delay: 0.0,
options: [.curveLinear],
animations: {
self.transform = rotate;
},
completion: nil)
// scaling and fading
UIView.animate(withDuration: duration/2.0, animations: {
self.transform = self.transform.scaledBy(x: 0.8, y: 0.8)
self.alpha = 1
}) { (true) in
UIView.animate(withDuration: duration/2.0, animations: {
self.transform = self.transform.scaledBy(x: 0.1, y: 0.1)
self.alpha = 0
})
}
}
Try using CGAffineTransformConcat()
CGAffineTransform scale = CGAffineTransformMakeScale(0.8, 0.8);
self.transform = CGAffineTransformConcat(CGAffineTransformRotate(self.transform, M_PI / 2), scale);
Currently there is a view I'm trying to translate(move), rotate and scale a view at the same time. For so strange reason it's only scaling it when I put scale at the bottom. But when I change the order and put the scaling first it rotates and translates the view properly but the scale of the view changes briefly to its correct scale before changing back to its original size. I need it to stay in it's scaled form. Here is the code:
class ViewController: UIViewController {
let newView = UIView(frame: CGRect(x: 10, y: 10, width: 100, height: 100))
override func viewDidLoad() {
super.viewDidLoad()
self.view.addSubview(newView)
UIView.animate(withDuration: 1.0, animations: {
self.newView.transform = CGAffineTransform(translationX: 50, y: 70)//translation
self.newView.transform = CGAffineTransform(rotationAngle: -CGFloat.pi / 2)//rotation
self.newView.transform = CGAffineTransform(scaleX: 1, y: 0.5)//scale
})
}
}
Try combine the transforms first, then apply them at a time:
let translate = CGAffineTransform(translationX: 50, y: 70)
UIView.animate(withDuration: 1.0, animations: {
self.view.transform = translate.rotated(by: -CGFloat.pi / 2).scaledBy(x: 1, y: 0.5)
})
I'm totally newbies with iOS Swift developement and i try to combine three parameters in a single animations but i don't succeed.
I think the solution is here -Apple Dev Core Animation Programming Guide by grouping the animations but being a beginner and after a lot of Internet research i can't find what i'm looking for.
What do you think of my code and what is for you the best solution to combine performance and stability.
I want to point out that the purpose of this animation is to create an animated Splashscreen. There are other elements (UIImage) that will be to animates.
Here is my code:
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
logoImg.alpha = 0
logoImg.transform = CGAffineTransform(translationX: 0, y: -200)
logoImg.transform = CGAffineTransform(scaleX: 0, y: 0)
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
UIView.animate(withDuration: 1.0, delay: 1.0, usingSpringWithDamping: 0.6, initialSpringVelocity: 10, options: [.curveEaseOut], animations: {
self.logoImg.transform = CGAffineTransform(translationX: 0, y: 0)
self.logoImg.transform = CGAffineTransform(scaleX: 1, y: 1)
self.logoImg.alpha = 1
}, completion: nil)
}
Based on what I am seeing you are wanting to preset the animation and translate it back. In that case I would do this.
self.logoImg.transform = CGAffineTransform(translationX: 0, y: -200).concatenating(CGAffineTransform(scaleX: 0, y: 0))
self.logoImg.alpha = 0
UIView.animate(withDuration: 1.0, delay: 1.0, usingSpringWithDamping: 0.6, initialSpringVelocity: 10, options: [.curveEaseOut], animations: {
self.logoImg.transform = .identity
self.logoImg.alpha = 1
}, completion: nil)
I think you may not be seeing all the animation so try to start the scale at 0.5
self.logoImg.transform = CGAffineTransform(translationX: 0, y: -200).concatenating(CGAffineTransform(scaleX: 0.5, y: 0.5))
self.logoImg.alpha = 0
UIView.animate(withDuration: 1.0, delay: 1.0, usingSpringWithDamping: 0.6, initialSpringVelocity: 1, options: [.curveEaseOut], animations: {
self.logoImg.transform = .identity
self.logoImg.alpha = 1
}, completion: nil)
The key here is that the animation is animating back the original identity. Hope this helps
You can use concatenating method to combining two existing affine transforms.
UIView.animate(withDuration: 1.0, delay: 1.0, usingSpringWithDamping: 0.6, initialSpringVelocity: 10, options: [.curveEaseOut], animations: {
let translation = CGAffineTransform(translationX: 0, y: 0)
let scale = CGAffineTransform(scaleX: 1, y: 1)
self.logoImg.transform = translation.concatenating(scale)
self.logoImg.alpha = 1
}, completion: nil)
Look at Apple Document for more info. Hope it help. :)
Rotate and Translate and make it like parallax effect in tableview header:
func setupTableHeaderView() {
self.customHeaderView = UIView(frame: CGRect(x: 0, y: 0, width: SCREEN_WIDTH, height: 200))
self.customHeaderView?.backgroundColor = .white
self.customImageView = UIImageView(frame: CGRect(x: 0, y: 0, width: SCREEN_WIDTH, height: 200))
self.customImageView?.image = ImageNamed(name: "camera")
self.customImageView?.contentMode = .center
self.customHeaderView?.addSubview(self.customImageView!)
self.tableHeaderView = self.customHeaderView
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
let yPos = scrollView.contentOffset.y
if yPos < 0 {
let scaleX = ((yPos * -1) / 200) + 1
let translateY = yPos / 2
var commonTransform = CGAffineTransform.identity
commonTransform = commonTransform.translatedBy(x: 0, y: translateY)
commonTransform = commonTransform.scaledBy(x: scaleX, y: scaleX)
self.customImageView?.transform = commonTransform
}else{
self.customImageView?.transform = CGAffineTransform.identity
}
}
NOTE : Make sure the View you apply transform to is SUBVIEW of the header view, not header view itself. In above example customImageView is subview of main headerview.
You can use this also with swift 3.0.1:
UIView.transition(with: self.imageView,
duration:0.5,
options: .transitionCrossDissolve,
animations: { self.imageView.image = newImage },
completion: nil)
Reference: https://gist.github.com/licvido/bc22343cacfa3a8ccf88