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    <p>Yet another solution using a layer mask, but instead draws the gradient by hand and does not require images. View is the view with the animation, transparency is a float from 0 - 1 defining the amount of transparency (1 = no transparency which is pointless), and gradientWidth is the desired width of the gradient.</p> <pre><code>CAGradientLayer *gradientMask = [CAGradientLayer layer]; gradientMask.frame = view.bounds; CGFloat gradientSize = gradientWidth / view.frame.size.width; UIColor *gradient = [UIColor colorWithWhite:1.0f alpha:transparency]; NSArray *startLocations = @[[NSNumber numberWithFloat:0.0f], [NSNumber numberWithFloat:(gradientSize / 2)], [NSNumber numberWithFloat:gradientSize]]; NSArray *endLocations = @[[NSNumber numberWithFloat:(1.0f - gradientSize)], [NSNumber numberWithFloat:(1.0f -(gradientSize / 2))], [NSNumber numberWithFloat:1.0f]]; CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"locations"]; gradientMask.colors = @[(id)gradient.CGColor, (id)[UIColor whiteColor].CGColor, (id)gradient.CGColor]; gradientMask.locations = startLocations; gradientMask.startPoint = CGPointMake(0 - (gradientSize * 2), .5); gradientMask.endPoint = CGPointMake(1 + gradientSize, .5); view.layer.mask = gradientMask; animation.fromValue = startLocations; animation.toValue = endLocations; animation.repeatCount = HUGE_VALF; animation.duration = 3.0f; [gradientMask addAnimation:animation forKey:@"animateGradient"]; </code></pre> <p><strong>SWIFT VERSION:</strong></p> <pre><code>let transparency:CGFloat = 0.5 let gradientWidth: CGFloat = 40 let gradientMask = CAGradientLayer() gradientMask.frame = swipeView.bounds let gradientSize = gradientWidth/swipeView.frame.size.width let gradient = UIColor(white: 1, alpha: transparency) let startLocations = [0, gradientSize/2, gradientSize] let endLocations = [(1 - gradientSize), (1 - gradientSize/2), 1] let animation = CABasicAnimation(keyPath: "locations") gradientMask.colors = [gradient.CGColor, UIColor.whiteColor().CGColor, gradient.CGColor] gradientMask.locations = startLocations gradientMask.startPoint = CGPointMake(0 - (gradientSize*2), 0.5) gradientMask.endPoint = CGPointMake(1 + gradientSize, 0.5) swipeView.layer.mask = gradientMask animation.fromValue = startLocations animation.toValue = endLocations animation.repeatCount = HUGE animation.duration = 3 gradientMask.addAnimation(animation, forKey: "animateGradient") </code></pre> <p>Swift 3</p> <pre><code>fileprivate func addGradientMaskToView(view:UIView, transparency:CGFloat = 0.5, gradientWidth:CGFloat = 40.0) { let gradientMask = CAGradientLayer() gradientMask.frame = view.bounds let gradientSize = gradientWidth/view.frame.size.width let gradientColor = UIColor(white: 1, alpha: transparency) let startLocations = [0, gradientSize/2, gradientSize] let endLocations = [(1 - gradientSize), (1 - gradientSize/2), 1] let animation = CABasicAnimation(keyPath: "locations") gradientMask.colors = [gradientColor.cgColor, UIColor.white.cgColor, gradientColor.cgColor] gradientMask.locations = startLocations as [NSNumber]? gradientMask.startPoint = CGPoint(x:0 - (gradientSize * 2), y: 0.5) gradientMask.endPoint = CGPoint(x:1 + gradientSize, y: 0.5) view.layer.mask = gradientMask animation.fromValue = startLocations animation.toValue = endLocations animation.repeatCount = HUGE animation.duration = 3 gradientMask.add(animation, forKey: nil) } </code></pre>
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    1. COWorks like a charm! You should replace the repeatCount constant with HUGE_VALF as the docs suggest.
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