How to draw a rounded rectangle in Core Graphics / Quartz 2D?

Question

I need to draw an outline for a rounded rectangle. I know I can make lines and arcs, but maybe there is also a function for rounded rects?

Answer 1

CGPathCreateWithRoundedRect() will do what you want.

CGPathRef CGPathCreateWithRoundedRect(
   CGRect rect,
   CGFloat cornerWidth,
   CGFloat cornerHeight,
   const CGAffineTransform *transform
);

Available starting in iOS 7.0

Answer 2

Swift:

    let rect: CGRect = ...

    let path = UIBezierPath(roundedRect: rect, cornerRadius: 5.0)
    CGContextAddPath(context, path.CGPath)
    CGContextSetStrokeColorWithColor(context, UIColor.clearColor().CGColor)
    CGContextDrawPath(context, CGPathDrawingMode.FillStroke)

Answer 3

Swift 4.2

    let lineWidth: CGFloat = 5.0
    let path = UIBezierPath(roundedRect: rect.insetBy(dx: lineWidth/2.0, dy: lineWidth/2.0), cornerRadius: 10。0)
    path.lineWidth = lineWidth
    UIColor.green.setStroke()
    path.stroke()