Related
I have an imageView and want it to rotate 360° all the time, but I found an issue which is that when the App enters background and then back to the foreground, the rotate animation will be stopped.
And I don't want to re-call the function rotate360Degree() when the app back to the foreground, the reason is that I want the rotate-animation will start at the position where it left when entering background, instead of rotating from 0 again.
But when I call the function resumeRotate(), it doesn't work.
The extension as follow:
extension UIImageView {
// 360度旋转图片
func rotate360Degree() {
let rotationAnimation = CABasicAnimation(keyPath: "transform.rotation.z") // 让其在z轴旋转
rotationAnimation.toValue = NSNumber(value: .pi * 2.0) // 旋转角度
rotationAnimation.duration = 20 // 旋转周期
rotationAnimation.isCumulative = true // 旋转累加角度
rotationAnimation.repeatCount = MAXFLOAT // 旋转次数
rotationAnimation.autoreverses = false
layer.add(rotationAnimation, forKey: "rotationAnimation")
}
// 暂停旋转
func pauseRotate() {
layer.pauseAnimation()
}
// 恢复旋转
func resumeRotate() {
layer.resumeAnimation()
}
}
Here is the layer Extension :
var pauseTime:CFTimeInterval!
extension CALayer {
//暂停动画
func pauseAnimation() {
pauseTime = convertTime(CACurrentMediaTime(), from: nil)
speed = 0.0
timeOffset = pauseTime
}
//恢复动画
func resumeAnimation() {
// 1.取出时间
pauseTime = timeOffset
// 2.设置动画的属性
speed = 1.0
timeOffset = 0.0
beginTime = 0.0
// 3.设置开始动画
let startTime = convertTime(CACurrentMediaTime(), from: nil) - pauseTime
beginTime = startTime
}
}
I can solve the above 'stopped' issue with CADisplayLink, but the animation will not rotate from the position where it left(rotate all the time).
I wonder how to solve it with CADisplayLink?
And how with the above core animation?
displayLink = CADisplayLink(target: self, selector: #selector(rotateImage))
displayLink.add(to: .current, forMode: .commonModes)
func rotateImage(){
let angle = CGFloat(displayLink.duration * Double.pi / 18)
artworkImageView.transform = artworkImageView.transform.rotated(by: angle)
}
You can do this with UIKit's higher-level block based animation api. If you want a continuously rotating view with 20.0 second duration. You can with a function like:
func animateImageView()
{
UIView.animate(withDuration: 10.0, delay: 0.0, options: [.beginFromCurrentState, .repeat, .curveLinear], animations:
{ [unowned self] in
var transform = self.imageView.transform
transform = transform.concatenating(CGAffineTransform(rotationAngle: CGFloat.pi))
self.imageView.transform = transform
},
completion:
{ _ in
UIView.animate(withDuration: 10.0, delay: 0.0, options: [.beginFromCurrentState, .curveLinear], animations:
{ [unowned self] in
var transform = self.imageView.transform
transform = transform.concatenating(CGAffineTransform(rotationAngle: CGFloat.pi / 2.0))
self.imageView.transform = transform
})
})
}
This will just rotate the view by 180 degrees then once that is complete rotate it another 180 for 360 degree rotation. The .repeat option will cause it to repeat indefinitely. However, the animation will stop when the app is backgrounded. For that, we need to save the state of the presentation layer of the view being rotated. We can do that by storing the CGAffineTransform of the presentation layer and then setting that transform to the view being animated when the app comes back into the foreground. Here's an example with a UIImageView
class ViewController: UIViewController
{
#IBOutlet weak var imageView: UIImageView!
var imageViewTransform = CGAffineTransform.identity
override func viewDidLoad()
{
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(self.didEnterBackground), name: .UIApplicationDidEnterBackground, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(self.willEnterForeground), name: .UIApplicationWillEnterForeground, object: nil)
}
override func viewDidAppear(_ animated: Bool)
{
super.viewDidAppear(animated)
animateImageView()
}
deinit
{
NotificationCenter.default.removeObserver(self)
}
func didEnterBackground()
{
imageViewTransform = imageView.layer.presentation()?.affineTransform() ?? .identity
}
func willEnterForeground()
{
imageView.transform = imageViewTransform
animateImageView()
}
func animateImageView()
{
UIView.animate(withDuration: 10.0, delay: 0.0, options: [.beginFromCurrentState, .repeat, .curveLinear], animations:
{ [unowned self] in
var transform = self.imageView.transform
transform = transform.concatenating(CGAffineTransform(rotationAngle: CGFloat.pi))
self.imageView.transform = transform
},
completion:
{ _ in
UIView.animate(withDuration: 10.0, delay: 0.0, options: [.beginFromCurrentState, .curveLinear], animations:
{ [unowned self] in
var transform = self.imageView.transform
transform = transform.concatenating(CGAffineTransform(rotationAngle: CGFloat.pi / 2.0))
self.imageView.transform = transform
})
})
}
}
Which results in this:
the function here was write in order to animation the view as following : 2 sec fade out, 2 sec fade in , 2 sec delay and repeat. for some reason the animation preform only once and do not repeat. what am i doing wrong here ?
UIView.animateWithDuration(6.0,
delay: 0.0,
options: [.AllowUserInteraction,.Repeat,.BeginFromCurrentState],
animations: {
UIView.animateWithDuration(2.0,
delay: 0.0,
options: [.AllowUserInteraction,.BeginFromCurrentState] ,
animations: {
//fade out
self.alpha = 0.5
},
completion: { finished in
UIView.animateWithDuration(2.0,
delay: 0.0,
options: [.AllowUserInteraction,.BeginFromCurrentState],
animations: {
//fade in
self.alpha = 1.0
},
completion: { finished in
UIView.animateWithDuration(2.0,
delay: 0.0,
options: [.AllowUserInteraction,.BeginFromCurrentState],
animations: {
},
completion: { finished in
})
})
})
},
completion: { finished in
})
}
You can use Core Animation delegates to repeat forever your animation, for example:
func animateCustomView(layer: CALayer) {
let speed = 60.0 / Double(view.layer.frame.size.width)
let duration: NSTimeInterval = Double(view.layer.frame.size.width - layer.frame.origin.x) * speed
let move = CABasicAnimation(keyPath: "position.x")
move.duration = duration
move.toValue = self.view.bounds.size.width + layer.bounds.width / 2
move.delegate = self
move.setValue("view", forKey: "name")
move.setValue(layer, forKey: "layer")
layer.addAnimation(move, forKey: nil)
}
// Core Animation Delegate implementation
override func animationDidStop(anim: CAAnimation, finished flag: Bool) {
if let name = anim.valueForKey("name") as? String{
if name == "view" {
let layer = anim.valueForKey("layer") as? CALayer
layer?.position.x = -(layer?.bounds.width)! / 2
delay(seconds: 0.5, completion: {
self.animateCustomView(layer!)
})
// Here add more delays and in completion handler block, add your chained animations.
} else if name == "other name" {
// or you can reinitialize it your another chained animations, delay it and call it again.
}
}
}
override func viewDidAppear(animated: Bool) {
animateCustomView(viewToAnimate.layer)
// Here call your other chained animations
}
The content of the funcs are just code for example purpose, you can add your custom animation there.
Here is my code. Intent is to continuously rotate the UIImageView named swirls[l]. However, there is a small pause between every rotation start/end. I have gone through every single animation tutorial but cant figure out what the mistake is?
let fullRotation = CGFloat(M_PI * 2)
let duration = 2.0
let delay = 0.0
let options = UIViewKeyframeAnimationOptions.Repeat | UIViewKeyframeAnimationOptions.CalculationModeLinear
UIView.animateKeyframesWithDuration(duration, delay: delay, options: options, animations: {
UIView.addKeyframeWithRelativeStartTime(0, relativeDuration: 1/3, animations: {
swirls[l].transform = CGAffineTransformMakeRotation(1/3 * fullRotation)
})
UIView.addKeyframeWithRelativeStartTime(1/3, relativeDuration: 1/3, animations: {
swirls[l].transform = CGAffineTransformMakeRotation(2/3 * fullRotation)
})
UIView.addKeyframeWithRelativeStartTime(2/3, relativeDuration: 1/3, animations: {
swirls[l].transform = CGAffineTransformMakeRotation(3/3 * fullRotation)
})
}, completion: {finished in
})
EDIT: I see that it has been suggested that a previous solution is available, but it simply does not work for continuous uninterrupted rotation. The only trick that worked for me is the answer that I chose below. Thanks
Try below extension for swift 4.
extension UIView {
func rotate360Degrees(duration: CFTimeInterval = 3) {
let rotateAnimation = CABasicAnimation(keyPath: "transform.rotation")
rotateAnimation.fromValue = 0.0
rotateAnimation.toValue = CGFloat(Double.pi * 2)
rotateAnimation.isRemovedOnCompletion = false
rotateAnimation.duration = duration
rotateAnimation.repeatCount=Float.infinity
self.layer.add(rotateAnimation, forKey: nil)
}
}
For start rotation.
MyView.rotate360Degrees()
And for Stop.
MyView.layer.removeAllAnimations()
You can use UIButton, UILabel and many more.
I'm not sure what's wrong with your code, but I've implemented continuous rotation using this method,
#IBAction func rotateView(sender: UIButton) {
UIView.animate(withDuration: 0.5, delay: 0, options: .curveLinear, animations: { () -> Void in
self.spinningView.transform = self.spinningView.transform.rotated(by: .pi / 2)
}) { (finished) -> Void in
self.rotateView(sender: sender)
}
}
If you want to continuous rotate Button or View and stop that rotation whenever you want then you can try this:
For start rotation:
#IBOutlet weak var RotateBtn: UIButton!
var timeTimer: Timer?
viewDidLoad()
{
self.rotateView()
timeTimer = Timer.scheduledTimer(timeInterval: 0.5, target: self, selector: #selector(self.rotateView), userInfo: nil, repeats: true)
}
func rotateView()
{
UIView.animate(withDuration: 0.5, delay: 0, options: .curveLinear, animations: { () -> Void in
self.RotateBtn.transform = self.RotateBtn.transform.rotated(by: CGFloat(M_PI_4))
})
}
If you want to stop rotation then use:
#IBAction func StopBtn_Pressed(_ sender: AnyObject)
{
timeTimer?.invalidate()
self.RecordBtn.layer.removeAllAnimations()
}
I want to rotate an image view for 360 degrees indefinitely.
UIView.animate(withDuration: 2, delay: 0, options: [.repeat], animations: {
self.view.transform = CGAffineTransform(rotationAngle: 6.28318530717959)
}, completion: nil)
How can I do it?
UPDATE Swift 5.x
// duration will helps to control rotation speed
private func rotateView(targetView: UIView, duration: Double = 5) {
UIView.animate(withDuration: duration, delay: 0.0, options: .curveLinear, animations: {
targetView.transform = targetView.transform.rotated(by: .pi)
}) { finished in
self.rotateView(targetView: targetView, duration: duration)
}
}
Swift 2.x way to rotate UIView indefinitely, compiled from earlier answers:
// Rotate <targetView> indefinitely
private func rotateView(targetView: UIView, duration: Double = 1.0) {
UIView.animateWithDuration(duration, delay: 0.0, options: .CurveLinear, animations: {
targetView.transform = CGAffineTransformRotate(targetView.transform, CGFloat(M_PI))
}) { finished in
self.rotateView(targetView, duration: duration)
}
}
UPDATE Swift 3.x
// Rotate <targetView> indefinitely
private func rotateView(targetView: UIView, duration: Double = 1.0) {
UIView.animate(withDuration: duration, delay: 0.0, options: .curveLinear, animations: {
targetView.transform = targetView.transform.rotated(by: CGFloat(M_PI))
}) { finished in
self.rotateView(targetView: targetView, duration: duration)
}
}
Swift 3.0
let imgViewRing = UIImageView(image: UIImage(named: "apple"))
imgViewRing.frame = CGRect(x: 0, y: 0, width: UIImage(named: "apple")!.size.width, height: UIImage(named: "apple")!.size.height)
imgViewRing.center = CGPoint(x: self.view.frame.size.width/2.0, y: self.view.frame.size.height/2.0)
rotateAnimation(imageView: imgViewRing)
self.view.addSubview(imgViewRing)
This is the animation logic
func rotateAnimation(imageView:UIImageView,duration: CFTimeInterval = 2.0) {
let rotateAnimation = CABasicAnimation(keyPath: "transform.rotation")
rotateAnimation.fromValue = 0.0
rotateAnimation.toValue = CGFloat(.pi * 2.0)
rotateAnimation.duration = duration
rotateAnimation.repeatCount = .greatestFiniteMagnitude
imageView.layer.add(rotateAnimation, forKey: nil)
}
You can check output in this link
Use this extension to rotate UIImageView 360 degrees.
extension UIView {
func rotate360Degrees(duration: CFTimeInterval = 1.0, completionDelegate: AnyObject? = nil) {
let rotateAnimation = CABasicAnimation(keyPath: "transform.rotation")
rotateAnimation.fromValue = 0.0
rotateAnimation.toValue = CGFloat(M_PI)
rotateAnimation.duration = duration
if let delegate: CAAnimationDelegate = completionDelegate as! CAAnimationDelegate? {
rotateAnimation.delegate = delegate
}
self.layer.addAnimation(rotateAnimation, forKey: nil)
}
}
Than to rotate UIImageView simply use this method
self.YOUR_SUBVIEW.rotate360Degrees()
This one work for me in Swift 2.2:
let rotationAnimation = CABasicAnimation(keyPath: "transform.rotation.z")
rotationAnimation.fromValue = 0.0
rotationAnimation.toValue = 360 * CGFloat(M_PI/180)
let innerAnimationDuration : CGFloat = 1.0
rotationAnimation.duration = Double(innerAnimationDuration)
rotationAnimation.repeatCount = HUGE
self.imageView.addAnimation(rotationAnimation, forKey: "rotateInner")
I would stick it in a function like rotateImage() and in the completion code just call rotateImage() again. I think you should use M_PI (or the swift equivalent) for the rotation amount, though.
Updated for Swift 3:
I made an extension to UIView and included the following function within:
func rotate(fromValue: CGFloat, toValue: CGFloat, duration: CFTimeInterval = 1.0, completionDelegate: Any? = nil) {
let rotateAnimation = CABasicAnimation(keyPath: >"transform.rotation")
rotateAnimation.fromValue = fromValue
rotateAnimation.toValue = toValue
rotateAnimation.duration = duration
if let delegate: Any = completionDelegate {
rotateAnimation.delegate = delegate as? CAAnimationDelegate
}
self.layer.add(rotateAnimation, forKey: nil)
}
You can then call the function via (on a UIView I made into a button for example) :
monitorButton.rotate(fromValue: 0.0, toValue: CGFloat(M_PI * 2), completionDelegate: self)
Hope this helps!
I think what you really want here is to use a CADisplayLink. Reason being that this would be indefinitely smooth versus using completion blocks which may cause slight hiccups and are not as easily cancelable. See the following solution:
var displayLink : CADisplayLink?
var targetView = UIView()
func beginRotation () {
// Setup display link
self.displayLink = CADisplayLink(target: self, selector: #selector(onFrameInterval(displayLink:)))
self.displayLink?.preferredFramesPerSecond = 60
self.displayLink?.add(to: .current, forMode: RunLoop.Mode.default)
}
func stopRotation () {
// Invalidate display link
self.displayLink?.invalidate()
self.displayLink = nil
}
// Called everytime the display is refreshed
#objc func onFrameInterval (displayLink: CADisplayLink) {
// Get frames per second
let framesPerSecond = Double(displayLink.preferredFramesPerSecond)
// Based on fps, calculate how much target view should spin each interval
let rotationsPerSecond = Double(3)
let anglePerSecond = rotationsPerSecond * (2 * Double.pi)
let anglePerInterval = CGFloat(anglePerSecond / framesPerSecond)
// Rotate target view to match the current angle of the interval
self.targetView.layer.transform = CATransform3DRotate(self.targetView.layer.transform, anglePerInterval, 0, 0, 1)
}
Avoiding the completion closure with recursive calls!
Bit late to this party, but using UIView keyFrame animation & varying stages of rotation for each keyFrame, plus setting the animation curve works nicely. Here's an UIView class function -
class func rotate360(_ view: UIView, duration: TimeInterval, repeating: Bool = true) {
let transform1 = CGAffineTransform(rotationAngle: .pi * 0.75)
let transform2 = CGAffineTransform(rotationAngle: .pi * 1.5)
let animationOptions: UInt
if repeating {
animationOptions = UIView.AnimationOptions.curveLinear.rawValue | UIView.AnimationOptions.repeat.rawValue
} else {
animationOptions = UIView.AnimationOptions.curveLinear.rawValue
}
let keyFrameAnimationOptions = UIView.KeyframeAnimationOptions(rawValue: animationOptions)
UIView.animateKeyframes(withDuration: duration, delay: 0, options: [keyFrameAnimationOptions, .calculationModeLinear], animations: {
UIView.addKeyframe(withRelativeStartTime: 0, relativeDuration: 0.375) {
view.transform = transform1
}
UIView.addKeyframe(withRelativeStartTime: 0.375, relativeDuration: 0.375) {
view.transform = transform2
}
UIView.addKeyframe(withRelativeStartTime: 0.75, relativeDuration: 0.25) {
view.transform = .identity
}
}, completion: nil)
}
Looks pretty gnarly, with the weird rotation angles, but as the op & others have found, you can't just tell it to rotate 360
Try this one it works for me, i am rotating image for once
UIView.animateWithDuration(0.5, delay: 0.0, options: .CurveLinear, animations: {
self.imgViewReload.transform = CGAffineTransformRotate(self.imgViewReload.transform, CGFloat(M_PI))
}, completion: {
(value: Bool) in
UIView.animateWithDuration(0.5, delay: 0.0, options: .CurveLinear, animations: {
self.imgViewReload.transform = CGAffineTransformIdentity
}, completion: nil)
})
you can use this function ... just give it the view and the duration
it has two animations the the first rotates the view 180° and the other one rotates it to 360° then the function calls itself which allows it to continue the rotation animation infinitely
func infinite360Animation(targetView: UIView, duration: Double) {
UIView.animate(withDuration: duration/2, delay: 0, options: .curveLinear) {
targetView.transform = CGAffineTransform.identity.rotated(by: .pi )
} completion: { (_) in
UIView.animate(withDuration: duration/2, delay: 0, options: .curveLinear) {
targetView.transform = CGAffineTransform.identity.rotated(by: .pi * 2)
} completion: { (_) in
self.infinite360Animation(targetView: targetView, duration: duration)
}
}
}
You can then call the function like this
infinite360Animatio(targetView: yourView, duration: 3)
On your tabBarController, make sure to set your delegate and do the following didSelect method below:
func tabBarController(_ tabBarController: UITabBarController,
didSelect viewController: UIViewController) {
if let selectedItem:UITabBarItem = tabBarController.tabBar.selectedItem {
animated(tabBar: tabBarController.tabBar, selectedItem: selectedItem)
}
}
fileprivate func animated(tabBar: UITabBar, selectedItem:UITabBarItem){
if let view:UIView = selectedItem.value(forKey: "view") as? UIView {
if let currentImageView = view.subviews.first as? UIImageView {
rotate(imageView: currentImageView, completion: { (completed) in
self.restore(imageView: currentImageView, completion: nil)
})
}
}
}
fileprivate func rotate(imageView:UIImageView, completion:((Bool) ->Void)?){
UIView.animate(withDuration: animationSpeed, delay: 0.0, options: .curveLinear, animations: {
imageView.transform = CGAffineTransform.init(rotationAngle: CGFloat.pi)
}, completion: {
(value: Bool) in
completion?(value)
})
}
fileprivate func restore(imageView:UIImageView, completion:((Bool) ->Void)?){
UIView.animate(withDuration: animationSpeed, delay: 0.0, options: .curveLinear, animations: {
imageView.transform = CGAffineTransform.identity
}, completion: {
(value: Bool) in
completion?(value)
})
}
My simple goal is to fade animate hiding and showing functions.
Button.hidden = YES;
Simple enough. However, is it possible to have it fade out rather than just disappearing? It looks rather unprofessional that way.
In iOS 4 and later, there's a way to do this just using the UIView transition method without needing to import QuartzCore. You can just say:
Objective C
[UIView transitionWithView:button
duration:0.4
options:UIViewAnimationOptionTransitionCrossDissolve
animations:^{
button.hidden = YES;
}
completion:NULL];
Swift
UIView.transition(with: button, duration: 0.4,
options: .transitionCrossDissolve,
animations: {
self.button.isHidden = false
})
Previous Solution
Michail's solution will work, but it's not actually the best approach.
The problem with alpha fading is that sometimes the different overlapping view layers look weird as they fade out. There are some other alternatives using Core Animation. First include the QuartzCore framework in your app and add #import <QuartzCore/QuartzCore.h> to your header. Now you can do one of the following:
set button.layer.shouldRasterize = YES; and then use the alpha animation code that Michail provided in his answer. This will prevent the layers from blending weirdly, but has a slight performance penalty, and can make the button look blurry if it's not aligned exactly on a pixel boundary.
Alternatively:
Use the following code to animate the fade instead:
CATransition *animation = [CATransition animation];
animation.type = kCATransitionFade;
animation.duration = 0.4;
[button.layer addAnimation:animation forKey:nil];
button.hidden = YES;
The nice thing about this approach is you can crossfade any property of the button even if they aren't animatable (e.g. the text or image of the button), just set up the transition and then set your properties immediately afterwards.
UIView animated properties are:
- frame
- bounds
- center
- transform
- alpha
- backgroundColor
- contentStretch
Describe in:
Animations
isHidden is not one of them, so as I see it the best way is:
Swift 4:
func setView(view: UIView, hidden: Bool) {
UIView.transition(with: view, duration: 0.5, options: .transitionCrossDissolve, animations: {
view.isHidden = hidden
})
}
Objective C:
- (void)setView:(UIView*)view hidden:(BOOL)hidden {
[UIView transitionWithView:view duration:0.5 options:UIViewAnimationOptionTransitionCrossDissolve animations:^(void){
[view setHidden:hidden];
} completion:nil];
}
To fade out:
Objective-C
[UIView animateWithDuration:0.3 animations:^{
button.alpha = 0;
} completion: ^(BOOL finished) {//creates a variable (BOOL) called "finished" that is set to *YES* when animation IS completed.
button.hidden = finished;//if animation is finished ("finished" == *YES*), then hidden = "finished" ... (aka hidden = *YES*)
}];
Swift 2
UIView.animateWithDuration(0.3, animations: {
button.alpha = 0
}) { (finished) in
button.hidden = finished
}
Swift 3, 4, 5
UIView.animate(withDuration: 0.3, animations: {
button.alpha = 0
}) { (finished) in
button.isHidden = finished
}
To fade in:
Objective-C
button.alpha = 0;
button.hidden = NO;
[UIView animateWithDuration:0.3 animations:^{
button.alpha = 1;
}];
Swift 2
button.alpha = 0
button.hidden = false
UIView.animateWithDuration(0.3) {
button.alpha = 1
}
Swift 3, 4, 5
button.alpha = 0
button.isHidden = false
UIView.animate(withDuration: 0.3) {
button.alpha = 1
}
I use this little Swift 3 extension:
extension UIView {
func fadeIn(duration: TimeInterval = 0.5,
delay: TimeInterval = 0.0,
completion: #escaping ((Bool) -> Void) = {(finished: Bool) -> Void in }) {
UIView.animate(withDuration: duration,
delay: delay,
options: UIViewAnimationOptions.curveEaseIn,
animations: {
self.alpha = 1.0
}, completion: completion)
}
func fadeOut(duration: TimeInterval = 0.5,
delay: TimeInterval = 0.0,
completion: #escaping (Bool) -> Void = {(finished: Bool) -> Void in }) {
UIView.animate(withDuration: duration,
delay: delay,
options: UIViewAnimationOptions.curveEaseIn,
animations: {
self.alpha = 0.0
}, completion: completion)
}
}
Use this solution for a smooth fadeOut and fadeIn effects
extension UIView {
func fadeIn(duration: TimeInterval = 0.5, delay: TimeInterval = 0.0, completion: #escaping ((Bool) -> Void) = {(finished: Bool) -> Void in }) {
self.alpha = 0.0
UIView.animate(withDuration: duration, delay: delay, options: UIView.AnimationOptions.curveEaseIn, animations: {
self.isHidden = false
self.alpha = 1.0
}, completion: completion)
}
func fadeOut(duration: TimeInterval = 0.5, delay: TimeInterval = 0.0, completion: #escaping (Bool) -> Void = {(finished: Bool) -> Void in }) {
self.alpha = 1.0
UIView.animate(withDuration: duration, delay: delay, options: UIView.AnimationOptions.curveEaseOut, animations: {
self.isHidden = true
self.alpha = 0.0
}, completion: completion)
}
}
usage is as like
uielement.fadeIn()
uielement.fadeOut()
Thanks
Swift 3
func appearView() {
self.myView.alpha = 0
self.myView.isHidden = false
UIView.animate(withDuration: 0.9, animations: {
self.myView.alpha = 1
}, completion: {
finished in
self.myView.isHidden = false
})
}
swift 4.2
with extension :
extension UIView {
func hideWithAnimation(hidden: Bool) {
UIView.transition(with: self, duration: 0.5, options: .transitionCrossDissolve, animations: {
self.isHidden = hidden
})
}
}
simple method:
func setView(view: UIView, hidden: Bool) {
UIView.transition(with: view, duration: 0.5, options: .transitionCrossDissolve, animations: {
view.isHidden = hidden
})
}
the code of #Umair Afzal working fine in swift 5 after some changes
extension UIView {
func fadeIn(duration: TimeInterval = 0.5, delay: TimeInterval = 0.0, completion: #escaping ((Bool) -> Void) = {(finished: Bool) -> Void in }) {
self.alpha = 0.0
UIView.animate(withDuration: duration, delay: delay, options: UIView.AnimationOptions.curveEaseIn, animations: {
self.isHidden = false
self.alpha = 1.0
}, completion: completion)
}
func fadeOut(duration: TimeInterval = 0.5, delay: TimeInterval = 0.0, completion: #escaping (Bool) -> Void = {(finished: Bool) -> Void in }) {
self.alpha = 1.0
UIView.animate(withDuration: duration, delay: delay, options: UIView.AnimationOptions.curveEaseIn, animations: {
self.alpha = 0.0
}) { (completed) in
self.isHidden = true
completion(true)
}
}
}
for use
yourView.fadeOut()
yourView.fadeIn()
I created category for UIView for this purpose and implemented a special little bit different concept: visibility. The main difference of my solution is that you can call [view setVisible:NO animated:YES] and right after that synchronously check [view visible] and get correct result. This is pretty simple but extremely useful.
Besides, it is allowed to avoid using "negative boolean logic" (see Code Complete, page 269, Use positive boolean variable names for more information).
Swift
UIView+Visibility.swift
import UIKit
private let UIViewVisibilityShowAnimationKey = "UIViewVisibilityShowAnimationKey"
private let UIViewVisibilityHideAnimationKey = "UIViewVisibilityHideAnimationKey"
private class UIViewAnimationDelegate: NSObject {
weak var view: UIView?
dynamic override func animationDidStop(animation: CAAnimation, finished: Bool) {
guard let view = self.view where finished else {
return
}
view.hidden = !view.visible
view.removeVisibilityAnimations()
}
}
extension UIView {
private func removeVisibilityAnimations() {
self.layer.removeAnimationForKey(UIViewVisibilityShowAnimationKey)
self.layer.removeAnimationForKey(UIViewVisibilityHideAnimationKey)
}
var visible: Bool {
get {
return !self.hidden && self.layer.animationForKey(UIViewVisibilityHideAnimationKey) == nil
}
set {
let visible = newValue
guard self.visible != visible else {
return
}
let animated = UIView.areAnimationsEnabled()
self.removeVisibilityAnimations()
guard animated else {
self.hidden = !visible
return
}
self.hidden = false
let delegate = UIViewAnimationDelegate()
delegate.view = self
let animation = CABasicAnimation(keyPath: "opacity")
animation.fromValue = visible ? 0.0 : 1.0
animation.toValue = visible ? 1.0 : 0.0
animation.fillMode = kCAFillModeForwards
animation.removedOnCompletion = false
animation.delegate = delegate
self.layer.addAnimation(animation, forKey: visible ? UIViewVisibilityShowAnimationKey : UIViewVisibilityHideAnimationKey)
}
}
func setVisible(visible: Bool, animated: Bool) {
let wereAnimationsEnabled = UIView.areAnimationsEnabled()
if wereAnimationsEnabled != animated {
UIView.setAnimationsEnabled(animated)
defer { UIView.setAnimationsEnabled(!animated) }
}
self.visible = visible
}
}
Objective-C
UIView+Visibility.h
#import <UIKit/UIKit.h>
#interface UIView (Visibility)
- (BOOL)visible;
- (void)setVisible:(BOOL)visible;
- (void)setVisible:(BOOL)visible animated:(BOOL)animated;
#end
UIView+Visibility.m
#import "UIView+Visibility.h"
NSString *const UIViewVisibilityAnimationKeyShow = #"UIViewVisibilityAnimationKeyShow";
NSString *const UIViewVisibilityAnimationKeyHide = #"UIViewVisibilityAnimationKeyHide";
#implementation UIView (Visibility)
- (BOOL)visible
{
if (self.hidden || [self.layer animationForKey:UIViewVisibilityAnimationKeyHide]) {
return NO;
}
return YES;
}
- (void)setVisible:(BOOL)visible
{
[self setVisible:visible animated:NO];
}
- (void)setVisible:(BOOL)visible animated:(BOOL)animated
{
if (self.visible == visible) {
return;
}
[self.layer removeAnimationForKey:UIViewVisibilityAnimationKeyShow];
[self.layer removeAnimationForKey:UIViewVisibilityAnimationKeyHide];
if (!animated) {
self.alpha = 1.f;
self.hidden = !visible;
return;
}
self.hidden = NO;
CGFloat fromAlpha = visible ? 0.f : 1.f;
CGFloat toAlpha = visible ? 1.f : 0.f;
NSString *animationKey = visible ? UIViewVisibilityAnimationKeyShow : UIViewVisibilityAnimationKeyHide;
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:#"opacity"];
animation.duration = 0.25;
animation.fromValue = #(fromAlpha);
animation.toValue = #(toAlpha);
animation.delegate = self;
animation.removedOnCompletion = NO;
animation.fillMode = kCAFillModeForwards;
[self.layer addAnimation:animation forKey:animationKey];
}
#pragma mark - CAAnimationDelegate
- (void)animationDidStop:(CAAnimation *)animation finished:(BOOL)finished
{
if ([[self.layer animationForKey:UIViewVisibilityAnimationKeyHide] isEqual:animation]) {
self.hidden = YES;
}
}
#end
Swift 5.0, with generics:
func hideViewWithAnimation<T: UIView>(shouldHidden: Bool, objView: T) {
if shouldHidden == true {
UIView.animate(withDuration: 0.3, animations: {
objView.alpha = 0
}) { (finished) in
objView.isHidden = shouldHidden
}
} else {
objView.alpha = 0
objView.isHidden = shouldHidden
UIView.animate(withDuration: 0.3) {
objView.alpha = 1
}
}
}
Use:
hideViewWithAnimation(shouldHidden: shouldHidden, objView: itemCountLabelBGView)
hideViewWithAnimation(shouldHidden: shouldHidden, objView: itemCountLabel)
hideViewWithAnimation(shouldHidden: shouldHidden, objView: itemCountButton)
Here itemCountLabelBGView is a UIView, itemCountLabel is a UILabel & itemCountButton is a UIButton, So it will work for every view object whose parent class is UIView.
Swift 4
extension UIView {
func fadeIn(duration: TimeInterval = 0.5, delay: TimeInterval = 0.0, completion: #escaping ((Bool) -> Void) = {(finished: Bool) -> Void in }) {
self.alpha = 0.0
UIView.animate(withDuration: duration, delay: delay, options: UIViewAnimationOptions.curveEaseIn, animations: {
self.isHidden = false
self.alpha = 1.0
}, completion: completion)
}
func fadeOut(duration: TimeInterval = 0.5, delay: TimeInterval = 0.0, completion: #escaping (Bool) -> Void = {(finished: Bool) -> Void in }) {
self.alpha = 1.0
UIView.animate(withDuration: duration, delay: delay, options: UIViewAnimationOptions.curveEaseIn, animations: {
self.alpha = 0.0
}) { (completed) in
self.isHidden = true
completion(true)
}
}
}
And to use use it, simple call these functions like:
yourView.fadeOut() // this will hide your view with animation
yourView.fadeIn() /// this will show your view with animation
isHidden is an immediate value and you cannot affect an animation on it, instead of this you can use Alpha for hide your view
UIView.transition(with: view, duration: 0.5, options: .transitionCrossDissolve, animations: {
view.alpha = 0
})
And for showing:
UIView.transition(with: view, duration: 0.5, options: .transitionCrossDissolve, animations: {
view.alpha = 1
})
func flipViews(fromView: UIView, toView: UIView) {
toView.frame.origin.y = 0
self.view.isUserInteractionEnabled = false
UIView.transition(from: fromView, to: toView, duration: 0.5, options: .transitionFlipFromLeft, completion: { finished in
fromView.frame.origin.y = -900
self.view.isUserInteractionEnabled = true
})
}
You can try this.
func showView(objView:UIView){
objView.alpha = 0.0
UIView.animate(withDuration: 0.5, animations: {
objView.alpha = 0.0
}, completion: { (completeFadein: Bool) -> Void in
objView.alpha = 1.0
let transition = CATransition()
transition.duration = 0.5
transition.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
transition.type = kCATransitionFade
objView.layer.add(transition, forKey: nil)
})
}
func HideView(objView:UIView){
UIView.animate(withDuration: 0.5, animations: {
objView.alpha = 1.0
}, completion: { (completeFadein: Bool) -> Void in
objView.alpha = 0.0
let transition = CATransition()
transition.duration = 0.5
transition.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
transition.type = kCATransitionFade
objView.layer.add(transition, forKey: nil)
})
}
And pass your view name
showView(objView: self.viewSaveCard)
HideView(objView: self.viewSaveCard)
If your view is set to hidden by default or you change the Hidden state which I think you should in many cases, then none of the approaches in this page will give you both FadeIn/FadeOut animation, it will only animate one of these states, the reason is you are setting the Hidden state to false before calling UIView.animate method which will cause a sudden visibility and if you only animate the alpha then the object space is still there but it's not visible which will result to some UI issues.
So the best approach is to check first if the view is hidden then set the alpha to 0.0, like this when you set the Hidden state to false you won't see a sudden visibility.
func hideViewWithFade(_ view: UIView) {
if view.isHidden {
view.alpha = 0.0
}
view.isHidden = false
UIView.animate(withDuration: 0.3, delay: 0.0, options: .transitionCrossDissolve, animations: {
view.alpha = view.alpha == 1.0 ? 0.0 : 1.0
}, completion: { _ in
view.isHidden = !Bool(truncating: view.alpha as NSNumber)
})
}
UIView.transition(with:) function is nice and neat.
Many have posted it but none has noticed there lies a fault will show up only when you run it.
You can transition hidden property to true perfectly, whereas when you attempt to transition it to false, the view will simple disappear suddenly without any animation.
That's because this api only works within a view, which means when you transition a view to show, in fact itself shows immediately, only its content animated out gradually.
When you try to hide this view, itself hide right away, makes the animation to its content meaningless.
To solve this, when hiding a view, the transition target should be its parent view instead of the view you want to hide.
func transitionView(_ view: UIView?, show: Bool, completion: BoolFunc? = nil) {
guard let view = view, view.isHidden == show, let parent = view.superview else { return }
let target: UIView = show ? view : parent
UIView.transition(with: target, duration: 0.4, options: [.transitionCrossDissolve], animations: {
view.isHidden = !show
}, completion: completion)
}
UIView.transition(with: title3Label, duration: 0.4,
options: .transitionCrossDissolve,
animations: {
self.title3Label.isHidden = !self.title3Label.isHidden
})
Applying transition on View with some delay gives hide and show effect
You can do it VERY easily using Animatics library:
//To hide button:
AlphaAnimator(0) ~> button
//to show button
AlphaAnimator(1) ~> button
My solution for Swift 3. So, I created the function, that hide/unhide view in the right order(when hiding - set alpha to 0 and then isHidden to true; unhiding - first reveal the view and then set it's alpha to 1):
func hide(_ hide: Bool) {
let animations = hide ? { self.alpha = 0 } :
{ self.isHidden = false }
let completion: (Bool) -> Void = hide ? { _ in self.isHidden = true } :
{ _ in UIView.animate(withDuration: duration, animations: { self.alpha = 1 }) }
UIView.animate(withDuration: duration, animations: animations, completion: completion)
}
Swift 4 Transition
UIView.transition(with: view, duration: 3, options: .transitionCurlDown,
animations: {
// Animations
view.isHidden = hidden
},
completion: { finished in
// Compeleted
})
If you use the approach for older swift versions you'll get an error :
Cannot convert value of type '(_) -> ()' to expected argument type '(() -> Void)?'
Useful reference.
This code give an animation like pushing viewController in
uinavigation controller...
CATransition *animation = [CATransition animation];
animation.type = kCATransitionPush;
animation.subtype = kCATransitionFromRight;
animation.duration = 0.3;
[_viewAccountName.layer addAnimation:animation forKey:nil];
_viewAccountName.hidden = true;
Used this for pop animation...
CATransition *animation = [CATransition animation];
animation.type = kCATransitionPush;
animation.subtype = kCATransitionFromLeft;
animation.duration = 0.3;
[_viewAccountName.layer addAnimation:animation forKey:nil];
_viewAccountName.hidden = false;
Tried some of the exited answers, some only work for one situation, some of them need to add two functions.
Option 1
Nothing to do with view.isHidden.
extension UIView {
func animate(fadeIn: Bool, withDuration: TimeInterval = 1.0) {
UIView.animate(withDuration: withDuration, delay: 0.0, options: .curveEaseInOut, animations: {
self.alpha = fadeIn ? 1.0 : 0.0
})
}
}
Then pass isFadeIn (true or false)
view.animate(fadeIn: isFadeIn)
Option 2
Don't pass any parameter. It fades in or out according to isUserInteractionEnabled. This also suits the situation animate back and forth very well.
func animateFadeInOut(withDuration: TimeInterval = 1.0) {
self.isUserInteractionEnabled = !self.isUserInteractionEnabled
UIView.animate(withDuration: withDuration, delay: 0.0, options: .curveEaseInOut, animations: {
self.alpha = self.isUserInteractionEnabled ? 1.0 : 0.0
})
}
Then you call
yourView.animateFadeInOut()
Why self.isUserInteractionEnabled ?
Tried to replace self.isUserInteractionEnabled by self.isHidden,
no luck at all.
That's it. Cost me sometime, hope it helps someone.