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    <p>What you really should do is to <strong>animate the stroke of a CAShapeLayer</strong> where the path is a circle. This will be accelerated using Core Animation and is less messy then to draw part of a circle in -drawRect:.</p> <p>The code below will create a circle shape layer in the center of the screen and animate the stroke of it clockwise so that it looks as if it is being drawn. You can of course use any shape you'd like. (You can read <a href="http://oleb.net/blog/2010/12/animating-drawing-of-cgpath-with-cashapelayer/" rel="noreferrer" title="Animating the stroke of a shape layer">this article</a> on Ole Begemanns blog to learn more about how to animate the stroke of a shape layer.)</p> <p><strong>Note:</strong> that the stoke properties are not the same as the border properties on the layer. To change the width of the stroke you should use "lineWidth" instead of "borderWitdh" etc.</p> <pre><code>// Set up the shape of the circle int radius = 100; CAShapeLayer *circle = [CAShapeLayer layer]; // Make a circular shape circle.path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, 2.0*radius, 2.0*radius) cornerRadius:radius].CGPath; // Center the shape in self.view circle.position = CGPointMake(CGRectGetMidX(self.view.frame)-radius, CGRectGetMidY(self.view.frame)-radius); // Configure the apperence of the circle circle.fillColor = [UIColor clearColor].CGColor; circle.strokeColor = [UIColor blackColor].CGColor; circle.lineWidth = 5; // Add to parent layer [self.view.layer addSublayer:circle]; // Configure animation CABasicAnimation *drawAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"]; drawAnimation.duration = 10.0; // "animate over 10 seconds or so.." drawAnimation.repeatCount = 1.0; // Animate only once.. // Animate from no part of the stroke being drawn to the entire stroke being drawn drawAnimation.fromValue = [NSNumber numberWithFloat:0.0f]; drawAnimation.toValue = [NSNumber numberWithFloat:1.0f]; // Experiment with timing to get the appearence to look the way you want drawAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn]; // Add the animation to the circle [circle addAnimation:drawAnimation forKey:@"drawCircleAnimation"]; </code></pre>
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    1. POiPhone Core Animation - Drawing a Circle
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    1. USDavid Rönnqvist
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    1. POiPhone Core Animation - Drawing a Circle
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    1. COThanks David for this great peace of code! I have question: How do you animate filling of entire circle, and not just curved line? (the first thing you asked bennythemink in comment on his question)
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    2. CODavid, thank you. I was thinking of the same thing, basically just to increase line width until full circle, just thought if there's some other way, since I was looking for some animations which animate directly circle fill, not stroke, but I wasn't able to find them.
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    3. COThere are other ways. You could create a custom layer and animate it. Have a look at [this great tutorial for animating pie slices with a custom CALayer](http://blog.pixelingene.com/2012/02/animating-pie-slices-using-a-custom-calayer/)
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