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POCABasicAnimation with CALayer path doesn't animate
 

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    <p>I'm trying to animation the transition of a CALayer from normal corners to rounded corners. I only want to round the top corners, so I am using a UIBezierPath. Here's the code:</p> <pre><code>UIRectCorner corners = UIRectCornerTopLeft | UIRectCornerTopRight; UIBezierPath* newPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds byRoundingCorners:corners cornerRadii:CGSizeMake(8.0f, 8.0f)]; UIBezierPath* oldPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds byRoundingCorners:corners cornerRadii:CGSizeMake(0.0f, 0.0f)]; CAShapeLayer* layer = [CAShapeLayer layer]; layer.frame = self.bounds; layer.path = oldPath.CGPath; self.layer.mask = layer; CABasicAnimation* a = [CABasicAnimation animationWithKeyPath:@"path"]; [a setDuration:0.4f]; [a setFromValue:(id)layer.path]; [a setToValue:(id)newPath.CGPath]; layer.path = newPath.CGPath; [layer addAnimation:a forKey:@"path"]; </code></pre> <p>But when I run this, the corners are rounded, but there is no animation- it happens instantly. I have seen some similar questions here on SO, but they didn't solve my problem.</p> <p><a href="https://stackoverflow.com/questions/5065073/iphone-calayer-animation">iPhone CALayer animation</a></p> <p><a href="https://stackoverflow.com/questions/5924734/animating-calayers-shadowpath-property">Animating CALayer&#39;s shadowPath property</a></p> <p>I'm sure that I'm just doing one little thing wrong which is causing the problem, but for the life of me I can't figure it out. </p> <p><strong>Solution:</strong></p> <pre><code>- (void)roundCornersAnimated:(BOOL)animated { UIRectCorner corners = UIRectCornerTopLeft | UIRectCornerTopRight; UIBezierPath* newPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds byRoundingCorners:corners cornerRadii:CGSizeMake(8.0f, 8.0f)]; UIBezierPath* oldPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds byRoundingCorners:corners cornerRadii:CGSizeMake(0.0001f, 0.0001f)]; CAShapeLayer* layer = [CAShapeLayer layer]; layer.frame = self.bounds; self.layer.mask = layer; if(animated) { CABasicAnimation* a = [CABasicAnimation animationWithKeyPath:@"path"]; [a setDuration:0.4f]; [a setFromValue:(id)oldPath.CGPath]; [a setToValue:(id)newPath.CGPath]; layer.path = newPath.CGPath; [layer addAnimation:a forKey:@"path"]; } else { layer.path = newPath.CGPath; } } </code></pre> <p>Really all I needed to do was set a proper 'from' value for the animation.</p>
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