Tycoon Tycoon - 3 months ago 55
Swift Question

How do I create a circle with CALayer?

I have the code below tested, but when I give it constraints it becomes a little small circle:

override func drawRect(rect: CGRect) {
var path = UIBezierPath(ovalInRect: rect)
fillColor.setFill()
path.fill()

//set up the width and height variables
//for the horizontal stroke
let plusHeight:CGFloat = 300.0
let plusWidth:CGFloat = 450.0

//create the path
var plusPath = UIBezierPath()

//set the path's line width to the height of the stroke
plusPath.lineWidth = plusHeight

//move the initial point of the path
//to the start of the horizontal stroke
plusPath.moveToPoint(CGPoint(
x:self.bounds.width/2 - plusWidth/2 + 0.5,
y:self.bounds.height/2 + 0.5))

//add a point to the path at the end of the stroke
plusPath.addLineToPoint(CGPoint(
x:self.bounds.width/2 + plusWidth/2 + 0.5,
y:self.bounds.height/2 + 0.5))

}

Answer

Change radius and fillColor as you want. :)

import Foundation
import UIKit

class CircleLayerView: UIView {
    var circleLayer: CAShapeLayer!

    override func drawRect(rect: CGRect) {

        super.drawRect(rect)
        if circleLayer == nil {
            circleLayer = CAShapeLayer()
            let radius: CGFloat = 150.0
            circleLayer.path = UIBezierPath(roundedRect: CGRect(x: 0, y: 0, width: 2.0 * radius, height: 2.0 * radius)  , cornerRadius: radius).CGPath
            circleLayer.position = CGPoint(x: CGRectGetMidX(self.frame) - radius, y: CGRectGetMidY(self.frame) - radius)
            circleLayer.fillColor = UIColor.redColor().CGColor
            self.layer.addSublayer(circleLayer)

        }
    }
}