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POUILabel text animation with side to unlock effect
 

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    <p>I was wondering how do someone achieve the "slide to unlock effect" on a UILabel's text without using a static image as previously asked here.</p> <pre><code>// I'd like to use the uilable's current text to this sample code but not seem to be able to do it. // ---&gt; UIImage *textImage = [UIImage imageNamed:@"SlideToUnlock.png"]; CGFloat textWidth = textImage.size.width; CGFloat textHeight = textImage.size.height; CALayer *textLayer = [CALayer layer]; textLayer.contents = (id)[textImage CGImage]; textLayer.frame = CGRectMake(10.0f, 215.0f, textWidth, textHeight); CALayer *maskLayer = [CALayer layer]; // Mask image ends with 0.15 opacity on both sides. Set the background color of the layer // to the same value so the layer can extend the mask image. maskLayer.backgroundColor = [[UIColor colorWithRed:0.0f green:0.0f blue:0.0f alpha:0.15f] CGColor]; maskLayer.contents = (id)[[UIImage imageNamed:@"Mask.png"] CGImage]; // Center the mask image on twice the width of the text layer, so it starts to the left // of the text layer and moves to its right when we translate it by width. maskLayer.contentsGravity = kCAGravityCenter; maskLayer.frame = CGRectMake(-textWidth, 0.0f, textWidth * 2, textHeight); // Animate the mask layer's horizontal position CABasicAnimation *maskAnim = [CABasicAnimation animationWithKeyPath:@"position.x"]; maskAnim.byValue = [NSNumber numberWithFloat:textWidth]; maskAnim.repeatCount = 1e100f; maskAnim.duration = 1.0f; [maskLayer addAnimation:maskAnim forKey:@"slideAnim"]; textLayer.mask = maskLayer; [self.view.layer addSublayer:textLayer]; </code></pre> <p>Thanks</p>
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    1. COWhat would you use? An image generated programmatically? Would you use a different approach altogether? What's the problem with this approach that you're trying to solve?
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