Reset animation after removeAllAnimations() - ios

With great help from the community I made an zoom in-and-out animation of a button image. The problem is, after the first run the button is disabled and wont work again before the app is relaunched. What I want is that after the button is clicked and the animation is finished it goes back to the starting point, and you can click it again. Anybody here that can help me with that?
#IBAction func coffeeButton(sender: UIButton) {
var timer = NSTimer.scheduledTimerWithTimeInterval(5, target: self, selector: "stopButtonAnimation", userInfo: nil, repeats: false)
let options = UIViewAnimationOptions.Autoreverse | UIViewAnimationOptions.Repeat | UIViewAnimationOptions.CurveEaseInOut
UIView.animateWithDuration(0.5, delay: 0, options: options, animations: {
self.button.transform = CGAffineTransformMakeScale(0.5, 0.5)
}, completion: nil)
}
func stopButtonAnimation(){
button.layer.removeAllAnimations()
}

Corrected your stopButtonAnimation function.
What applying transform does is setting the scale of your button to it's original value, so you are able to see your animation again.
func stopButtonAnimation(){
button.layer.removeAllAnimations()
button.layer.transform = CATransform3DIdentity
}
Animation in your original code was stopped at the scale value of 0.5 so next time you click the button you just don't see it (because it had been animating scale from 0.5 to 0.5).

Related

UIView Animation Chaining Doesn't Work Properly

I am trying to animate a simple Loading label text to show 3 dots after it, with each dot having a second of delay.
Here is what i tried:
func animateLoading() {
UIView.animate(withDuration: 1, animations: {self.yukleniyorLabel.text = "Yükleniyor."}, completion: { _ in
UIView.animate(withDuration: 1, animations: {self.yukleniyorLabel.text = "Yükleniyor.."}, completion: { _ in
UIView.animate(withDuration: 1, animations: {self.yukleniyorLabel.text = "Yükleniyor..."})
})
})
}
But what i got is the all 3 dots appear in 1 second alltogether. Not in order. See here: https://streamable.com/yiz6s
What am i doing wrong with the chaining? Thanks in advance.
UIView animate is only for animatable view properties such as frame and background color. self.yukleniyorLabel.text is not an animatable property. So you get no animation.
Just use a Timer or delayed performance to change the text at time intervals.
You can use the scheduled Timer for showing text with three dots on the label with animation: ->
var i = 0
var timer : Timer?
loaderLabel.text = "Loading"
timer = Timer.scheduledTimer(timeInterval: 0.2, target: self, selector:#selector(ViewController.setText), userInfo: nil, repeats: true)
#objc func setText() {
loaderLabel.text = loaderLabel.text! + "."
i += 1
if i >= 3 {
timer?.invalidate()
}
}
output with animation: -> Loading...

UIView Animation and UIButton stop working b/c Home pressed - Swift 4

I have a playButton that performs a "breathing animation". The button works just fine when I press it. The problem occurs if I press the device's Home Button and then re-open the app. Upon re-opening, the playButton does not have the "breathing animation" and it does not work (nothing happens when it is pressed).
#IBOutlet weak var playButton: UIButton!
override func viewWillAppear(_ animated: Bool) {
UIView.animate(withDuration: 1.0,
delay: 0,
options: [.autoreverse, .repeat, .allowUserInteraction],
animations: {
self.playButton.transform = CGAffineTransform(scaleX: 1.175, y: 1.175)
},
completion: nil
)
}
I've dealt with this issue in a previous game app where I needed to save and pause the game if the user pressed the Home Button or if there was an interruption (incoming call). So, I am well aware of:
func applicationDidBecomeActive() {}
func applicationWillResignActive() {}
func applicationDidEnterBackground() {}
But, I am not dealing with a gameState, timer, the need to save data, etc. I simply want my button and its animation to work properly when the app re-opens after the Home Button is pressed.
I also tried using override func viewDidLayoutSubviews() {} instead of viewWillAppear. But that did not work.
First of all, if you have a multiple animations within the same ViewController (VC) that occur after playButton is pressed, then that may explain why the it is becoming disabled upon return from background. Why? I don't know. But I had a similar issue and resolved it by creating a new class and VC for the multiple animations that were originally set to occur when my UIButton was pressed. Inside of my button's IBAction, I simply created a segue to then new VC.
With regards to the animation, you could approach this two ways: 1) Pause and Resume the animation using CALayer OR 2) Simply use NotificationCenter without even having to touch any AppDelegate code. I prefer simple ways b/c it will save time and effort. So, try this code in the VC where the button animation is to occur:
override func viewWillAppear(_ animated: Bool) {
NotificationCenter.default.addObserver(self, selector:#selector(goingToBackground), name: UIApplication.didEnterBackgroundNotification, object: nil)
NotificationCenter.default.addObserver(self, selector:#selector(openingApp), name: UIApplication.willEnterForegroundNotification, object: nil)
UIView.animate(withDuration: 1.0,
delay: 0,
options: [.autoreverse, .repeat, .allowUserInteraction],
animations: {
self.playButton.transform = CGAffineTransform(scaleX: 1.175, y: 1.175)
},
completion: nil)
}
#objc func goingToBackground(){
playButton.transform = .identity
}
#objc func openingApp(){
self.view.layoutIfNeeded()
UIView.animate(withDuration: 1.0,
delay: 0.3,
options: [.autoreverse, .repeat, .allowUserInteraction],
animations: {
self.playButton.transform = CGAffineTransform(scaleX: 1.175, y: 1.175)}, completion: nil)
self.view.layoutIfNeeded()
}

Animating UIButton to zoom in and out on click

I got a button that I've replaced with an icon and when the icon is clicke I want it to zoom in and out for lets say 5 seconds. How can I accomplish this? I have made a set of 5 images with different sizes for the button, can I loop thru theese or is there an other way?
#IBAction func myButton(sender: UIButton){
//animation that zoom the button icon in and out
}
Edit: Im using Xcode 6.4
To show an alternative, I will show an approach with animating Layers.
More infos about it here
Add this code to your function (hints are in the code comments):
// specify the property you want to animate
let zoomInAndOut = CABasicAnimation(keyPath: "transform.scale")
// starting from the initial value 1.0
zoomInAndOut.fromValue = 1.0
// to scale down you set toValue to 0.5
zoomInAndOut.toValue = 0.5
// the duration for the animation is set to 1 second
zoomInAndOut.duration = 1.0
// how many times you want to repeat the animation
zoomInAndOut.repeatCount = 5
// to make the one animation(zooming in from 1.0 to 0.5) reverse to two animations(zooming back from 0.5 to 1.0)
zoomInAndOut.autoreverses = true
// because the animation consists of 2 steps, caused by autoreverses, you set the speed to 2.0, so that the total duration until the animation stops is 5 seconds
zoomInAndOut.speed = 2.0
// add the animation to your button
button.layer.addAnimation(zoomInAndOut, forKey: nil)
Result:
This will zoom in and out the button without using additional images:
let timer = NSTimer.scheduledTimerWithTimeInterval(5, target: self, selector: "stopButtonAnimation", userInfo: nil, repeats: false)
let options = UIViewAnimationOptions.Autoreverse | UIViewAnimationOptions.Repeat | UIViewAnimationOptions.CurveEaseInOut
UIView.animateWithDuration(0.25, delay: 0, options: options,
animations: {
self.button.transform = CGAffineTransformMakeScale(0.5, 0.5)
}, completion:nil)
.....
func stopButtonAnimation() {
button.layer.removeAllAnimations;
}

Tap is not detected on continuous scrolling of UICollectionView iOS?

I have a UICollectionView continuous scrolling using NSTimer, here is the code
let timer = NSTimer(timeInterval: 0.1, target: self, selector: #selector(HomeViewController.scrollToNextCard), userInfo: nil, repeats: true)
NSRunLoop.currentRunLoop().addTimer(timer!, forMode: NSDefaultRunLoopMode)
func scrollToNextCard(){
UIView.animateWithDuration(0.1, delay: 0.0, options: UIViewAnimationOptions.CurveEaseInOut, animations: {
// I am changing the contentOffset of collectionview for continuous scrolling
}, completion: {(finished:Bool) in
})
When tapping on any of visible cells when scrolling is in progress, delegate's method didSelectItemAtIndexpath is not being called. How do I achieve tapping detection at the same time maintaining scrolling of collection view. Please help thanks
I found the answer for the same, I had to add AllowUserInteraction flag on the animation block as in the code:
func scrollToNextCard(){
UIView.animateWithDuration(Constants.CardFlowTimeInterval, delay: 0.0, options: [.CurveEaseInOut,.AllowUserInteraction], animations: {
}, completion: {(finished:Bool) in
})
}

better way to set alpha for a view after a few seconds in apple watch / watchkit in swift

I am trying to set alpha with animation to image view in swift for apple watch application.
to do that i have tried code below
UIView.animateWithDuration(1.5, animations: {
self.splashscreenImage.alpha = 1.0
return
})
but its iving error as
'WKInterfaceImage' does not have a member named 'alpha'
so i implemented code below in willActivate function
var timer = NSTimer.scheduledTimerWithTimeInterval(5, target: self, selector: Selector("splashscreenAlpha"), userInfo: nil, repeats: false)
and
func splashscreenAlpha() {
self.splashscreenImage.setAlpha(0.0)
}
but in this scenario, view is like invisible, like image view has a black background. But i would like it to gone with animation. How can i do that?
You should try using
UIView.animateWithDuration(1.5, animations: {
self.splashscreenImage.setAlpha(1.0)
return
})
to make alpha animation.

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