How do you create a wiggle animation similar to iphone deletion animation

Question

We are currently developing an application that contains a series of icons. We want the icons to wiggle like the app deletion animations when pressed. What would be the be

Answer 1

I tried to do something like that for an iPad app.

I tried to do some rotations (with CAAnimation) to the view. Here is a sample code I wrote :

- (CAAnimation*)getShakeAnimation {

    CABasicAnimation *animation;
    CATransform3D transform;

    // Create the rotation matrix
    transform = CATransform3DMakeRotation(0.08, 0, 0, 1.0);

    // Create a basic animation to animate the layer's transform
    animation = [CABasicAnimation animationWithKeyPath:@"transform"];

    // Assign the transform as the animation's value
    animation.toValue = [NSValue valueWithCATransform3D:transform];

    animation.autoreverses = YES;  
    animation.duration = 0.1;  
    animation.repeatCount = HUGE_VALF;  

    return animation;

}

And you should try to apply this one to your layer (with function : addAnimation). Here, autoreverses property is to alternate left and right orientation. Try setting others values to the angle and duration.

But in my case I had to add others angles to the CATransform3DMakeRotation method, depending on the initial layer orientation ^^

Good Luck ! Vincent

Answer 2

Rewrote Sebastien's answer in Swift 3.

let wiggleBounceY = 4.0
let wiggleBounceDuration = 0.12
let wiggleBounceDurationVariance = 0.025

let wiggleRotateAngle = 0.06
let wiggleRotateDuration = 0.10
let wiggleRotateDurationVariance = 0.025

func randomize(interval: TimeInterval, withVariance variance: Double) -> Double{
    let random = (Double(arc4random_uniform(1000)) - 500.0) / 500.0
    return interval + variance * random
}

func startWiggle(for view: UIView){

    //Create rotation animation
    let rotationAnim = CAKeyframeAnimation(keyPath: "transform.rotation.z")
    rotationAnim.values = [-wiggleRotateAngle, wiggleRotateAngle]
    rotationAnim.autoreverses = true
    rotationAnim.duration = randomize(interval: wiggleRotateDuration, withVariance: wiggleRotateDurationVariance)
    rotationAnim.repeatCount = HUGE

    //Create bounce animation
    let bounceAnimation = CAKeyframeAnimation(keyPath: "transform.translation.y")
    bounceAnimation.values = [wiggleBounceY, 0]
    bounceAnimation.autoreverses = true
    bounceAnimation.duration = randomize(interval: wiggleBounceDuration, withVariance: wiggleBounceDurationVariance)
    bounceAnimation.repeatCount = HUGE

    //Apply animations to view
    UIView.animate(withDuration: 0) {
        view.layer.add(rotationAnim, forKey: "rotation")
        view.layer.add(bounceAnimation, forKey: "bounce")
        view.transform = .identity
    }
}

func stopWiggle(for view: UIView){
    view.layer.removeAllAnimations()
}