Social Tunes Sharer Code Sample: Ripple Animation (Part 1)

RippleAnimation.swift

// From Andrew's code

func applyToView(view: UIView, fromView: UIView, duration: NSTimeInterval) {
    let rect = view.convertRect(fromView.bounds, fromCoordinateSpace: fromView)
    applyToView(view, fromRect: rect, duration: duration)
}

func applyToView(view: UIView, fromRect: CGRect, duration: NSTimeInterval) {
    view.addSubview(tintView)

    tintView.transform = CGAffineTransformIdentity
    tintView.frame = fromRect
    tintView.layer.cornerRadius = min(CGRectGetWidth(fromRect), CGRectGetHeight(fromRect)) / 2

    // Choose a scale that will make the layer big enough to fill the entire superlayer
    let xScaleFactor = CGRectGetWidth(view.bounds) / CGRectGetWidth(fromRect)
    let yScaleFactor = CGRectGetHeight(view.bounds) / CGRectGetHeight(fromRect)
    let scaleFactor = max(xScaleFactor, yScaleFactor) * 2
    let transform = CGAffineTransformMakeScale(scaleFactor, scaleFactor)

    // Kick off the animation
    UIView.animateWithDuration(duration, delay: 0, options: [.CurveLinear], animations: {
        self.tintView.transform = transform
    }, completion: nil)
}