Border in circle UIView using Swift - ios

Question

I'm trying to make an UIView with border but I only make it appear in UIView not only on the circle.
In the brown circle I want a black border, but it has to be in the circle not in the UIView.
I have a class called Ball where I draw the circle.
class Ball: UIView {
var desiredColour = UIColor.blueColor()
struct mine {
static var p = UIBezierPath(ovalInRect: CGRectMake(0,0,118,117))
}
override func drawRect(rect: CGRect) {
// Drawing code
desiredColour.setFill()
mine.p.fill()
}
func colour() {
var randColor: UIColor = Colors.randomColor()
Colors.ballColor = randColor
Colors.colorPosition = find(Colors.arrayColors, randColor)!
desiredColour = randColor
self.setNeedsDisplay()
}
}
I used the code:
override func drawRect(rect: CGRect) {
// Drawing code
desiredColour.setFill()
let desiredBorderColor = UIColor.blackColor()
desiredBorderColor.setStroke()
self.layer.borderWidth = 3.0
self.layer.cornerRadius = self.frame.size.width/2.0
mine.p.fill()
mine.p.stroke()
}
but i get a border with a little cuts:

Answer 1

Try calling this function by passing you view as a parameter
func drawBlackBorder(view: UIView) {
view.layer.borderColor = UIColor.blackColor
view.layer.borderWidth = 1.0
view.layer.cornerRadius = view.frame.size.width/2.0
view.backgroundColor = UIColor.brownColor
}

Answer 2

override func drawRect(rect: CGRect) {
// Drawing code
desiredColour.setFill()
let desiredBorderColor = UIColor.blackColor()
desiredBorderColor.setStroke()
mine.p.lineWidth = 2.0 //set to whatever you want
mine.p.fill()
mine.p.stroke()
}
But note that for border to work you need to have some space around you circle.
Do the following. Declare myBorderWidth (of type CGFloat) property and then change
static var p = UIBezierPath(ovalInRect: CGRectMake(0,0,118,117))
to
static var p = UIBezierPath(ovalInRect: CGRectMake(myBorderWidth/2,myBorderWidth/2,118-myBorderWidth/2,117-myBorderWidth/2))
You can also remove repetitions of myBorderWidth/2 by declaring it as a property.

Answer 3

No need to modify layer, just set up UIBezierPath with proper insets depending on border thickness and set it's width (tested on Swift 4.2):
var fillColor: UIColor //circle color
var strokeColor: UIColor //border color
var borderWidth: CGFloat //border width
override func draw(_ rect: CGRect) {
fillColor.setFill()
strokeColor.setStroke()
let circlePath = UIBezierPath(ovalIn: CGRect(x: borderWidth, y: borderWidth, width: rect.width - borderWidth*2, height: rect.height - borderWidth*2))
circlePath.lineWidth = borderWidth
circlePath.stroke()
circlePath.fill()
}