UICollectionViewCell Shake - iphone

Question

I have created a UICollectionView and would like to have all the cells shake like the edit mode of the springboard on the iPhone. I have created my shake code but don't know how to implement it. I have custom cells so I assume it goes in there but don't know how it gets implemented. Thank You.
#define degreesToRadians(x) (M_PI * (x) / 180.0)
#define kAnimationRotateDeg 0.5
#define kAnimationTranslateX 1.0
#define kAnimationTranslateY 1.0
//startJiggling
int count = 1;
CGAffineTransform leftWobble = CGAffineTransformMakeRotation(degreesToRadians( kAnimationRotateDeg * (count%2 ? +1 : -1 ) ));
CGAffineTransform rightWobble = CGAffineTransformMakeRotation(degreesToRadians( kAnimationRotateDeg * (count%2 ? -1 : +1 ) ));
CGAffineTransform moveTransform = CGAffineTransformTranslate(rightWobble, -kAnimationTranslateX, -kAnimationTranslateY);
CGAffineTransform conCatTransform = CGAffineTransformConcat(rightWobble, moveTransform);
self.transform = leftWobble; // starting point
[UIView animateWithDuration:0.1
delay:(count * 0.08)
options:UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionRepeat | UIViewAnimationOptionAutoreverse
animations:^{ self.transform = conCatTransform; }
completion:nil];

Answer 1

If you put you're code in a method called startJiggling in your custom cell, then you could call this method in your controller:
[self.collectionView.visibleCells makeObjectsPerformSelector:#selector(startJiggling)];
That ensures that all visible cells will start jiggling.
Then I'd also set some flag indicating that your cells should jiggle and test for that in collectionView:cellForItemAtIndexPath:. If YES, then call your method.

Answer 2

Swift 5 Easy like this
Enter this 2 functions to your UICollectionViewCell and call it when ever you want to animate/stop, ex: cell render
func shake() {
let shakeAnimation = CABasicAnimation(keyPath: "transform.rotation")
shakeAnimation.duration = 0.05
shakeAnimation.repeatCount = 2
shakeAnimation.autoreverses = true
let startAngle: Float = (-2) * 3.14159/180
let stopAngle = -startAngle
shakeAnimation.fromValue = NSNumber(value: startAngle as Float)
shakeAnimation.toValue = NSNumber(value: 3 * stopAngle as Float)
shakeAnimation.autoreverses = true
shakeAnimation.duration = 0.15
shakeAnimation.repeatCount = 10000
shakeAnimation.timeOffset = 290 * drand48()
let layer: CALayer = self.layer
layer.add(shakeAnimation, forKey:"shaking")
}
func stopShaking() {
let layer: CALayer = self.layer
layer.removeAnimation(forKey: "shaking")
}
Help Source from Git

Answer 3

If anyone is curious on how to do this in Swift 2.0 the below should be a good starting point.
let animationRotateDegres: CGFloat = 0.5
let animationTranslateX: CGFloat = 1.0
let animationTranslateY: CGFloat = 1.0
let count: Int = 1
func wobble() {
let leftOrRight: CGFloat = (count % 2 == 0 ? 1 : -1)
let rightOrLeft: CGFloat = (count % 2 == 0 ? -1 : 1)
let leftWobble: CGAffineTransform = CGAffineTransformMakeRotation(degreesToRadians(animationRotateDegres * leftOrRight))
let rightWobble: CGAffineTransform = CGAffineTransformMakeRotation(degreesToRadians(animationRotateDegres * rightOrLeft))
let moveTransform: CGAffineTransform = CGAffineTransformTranslate(leftWobble, -animationTranslateX, -animationTranslateY)
let conCatTransform: CGAffineTransform = CGAffineTransformConcat(leftWobble, moveTransform)
transform = rightWobble // starting point
UIView.animateWithDuration(0.1, delay: 0.08, options: [.AllowUserInteraction, .Repeat, .Autoreverse], animations: { () -> Void in
self.transform = conCatTransform
}, completion: nil)
}
func degreesToRadians(x: CGFloat) -> CGFloat {
return CGFloat(M_PI) * x / 180.0
}
When I want to make my cells wobble I do so like this:
for cell in collectionView.visibleCells() {
let customCell: MyCustomCell = cell as! MyCustomCell
customCell.wobble()
}

Answer 4

Updated to swift 3 syntax:
let animationRotateDegres: CGFloat = 0.5
let animationTranslateX: CGFloat = 1.0
let animationTranslateY: CGFloat = 1.0
let count: Int = 1
func wobble() {
let leftOrRight: CGFloat = (count % 2 == 0 ? 1 : -1)
let rightOrLeft: CGFloat = (count % 2 == 0 ? -1 : 1)
let leftWobble: CGAffineTransform = CGAffineTransform(rotationAngle: degreesToRadians(x: animationRotateDegres * leftOrRight))
let rightWobble: CGAffineTransform = CGAffineTransform(rotationAngle: degreesToRadians(x: animationRotateDegres * rightOrLeft))
let moveTransform: CGAffineTransform = leftWobble.translatedBy(x: -animationTranslateX, y: -animationTranslateY)
let conCatTransform: CGAffineTransform = leftWobble.concatenating(moveTransform)
transform = rightWobble // starting point
UIView.animate(withDuration: 0.1, delay: 0.08, options: [.allowUserInteraction, .autoreverse], animations: { () -> Void in
self.transform = conCatTransform
}, completion: nil)
}
func degreesToRadians(x: CGFloat) -> CGFloat {
return CGFloat(M_PI) * x / 180.0
}

Answer 5

Place this line of code at two places:
[self.collectionView.visibleCells makeObjectsPerformSelector:#selector(startJiggling)];
-(void)collectionView:(UICollectionView *)collectionView didEndDisplayingCell:(UICollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath
-(void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView