An easy way to draw a circle using CAShapeLayer

An easy way to draw a circle is to create a CAShapeLayer and add a UIBezierPath.

objective-c

CAShapeLayer *circleLayer = [CAShapeLayer layer];
[circleLayer setPath:[[UIBezierPath bezierPathWithOvalInRect:CGRectMake(50, 50, 100, 100)] CGPath]];

swift

let circleLayer = CAShapeLayer();
circleLayer.path = UIBezierPath(ovalIn: CGRect(x: 50, y: 50, width: 100, height: 100)).cgPath;

After creating the CAShapeLayer we set its path to be a UIBezierPath.

Our UIBezierPath then draws a bezierPathWithOvalInRect. The CGRect we set will effect its size and position.

Now that we have our circle, we can add it to our UIView as a sublayer.

objective-c

[[self.view layer] addSublayer:circleLayer];

swift

view.layer.addSublayer(circleLayer)

Our circle is now visible in our UIView.

If we wish to customise our circle’s color properties we can easily do so by setting the CAShapeLayer‘s stroke– and fill color.

objective-c

[circleLayer setStrokeColor:[[UIColor redColor] CGColor]];
[circleLayer setFillColor:[[UIColor clearColor] CGColor]];

swift

shapeLayer.strokeColor = UIColor.red.cgColor;
shapeLayer.fillColor = UIColor.clear.cgColor;

Additionall properties can be found over at ’s documentation on the subject https://developer.apple.com/…/CAShapeLayer_class/index.html.