How to draw a simple rounded rect in swift (rounded corners)

Swift 5, 4

iOS 11

override func draw(_ rect: CGRect) {
  super.draw(rect)

  guard let context = UIGraphicsGetCurrentContext() else { return }

  context.saveGState()
  defer { context.restoreGState() }

  let path = UIBezierPath(
    roundedRect: rect,
    byRoundingCorners: [.topLeft, .topRight],
    cornerRadii: CGSize(width: 4, height: 4)
  )

  context.addPath(path.cgPath)
  context.closePath()

  context.setStrokeColor(UIColor.red.cgColor)
  context.strokePath()
}

How to create a rounded corner rectangle using BezierPath

 var roundRect = UIBezierPath(roundedRect: <CGRect>, byRoundingCorners: <UIRectCorner>, cornerRadii: <CGSize>)

Or for an example with values:

var roundRect = UIBezierPath(roundedRect: CGRectMake(0, 0, 100, 100), byRoundingCorners:.AllCorners, cornerRadii: CGSizeMake(16.f, 16.f))

Swift 5

var roundRect = UIBezierPath(roundedRect: CGRect(x: 0, y: 0, width: 100, height: 100), byRoundingCorners:.allCorners, cornerRadii: CGSize(width: 16.0, height: 16.0))

//Put this code in ur drawRect

Objective - C

 - (void)drawRect:(CGRect)rect
{

CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSaveGState(ctx);


 CGPathRef clippath = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(x,y, width, height) cornerRadius:6].CGPath;
CGContextAddPath(ctx, clippath);

CGContextSetFillColorWithColor(ctx, self.color.CGColor);

CGContextClosePath(ctx);
CGContextFillPath(ctx);

[self.color set];


[_path closePath]; // Implicitly does a line between p4 and p1
[_path fill]; // If you want it filled, or...
[_path stroke]; // ...if you want to draw the outline.
CGContextRestoreGState(ctx);
}

Swift 3

func drawRect(rect : CGRect)
{
// Size of rounded rectangle
let rectWidth = rect.width
let rectHeight = rect.height

// Find center of actual frame to set rectangle in middle
let xf:CGFloat = (self.frame.width  - rectWidth)  / 2
let yf:CGFloat = (self.frame.height - rectHeight) / 2

let ctx: CGContext = UIGraphicsGetCurrentContext()!
ctx.saveGState()

let rect = CGRect(x: xf, y: yf, width: rectWidth, height: rectHeight)
let clipPath: CGPath = UIBezierPath(roundedRect: rect, cornerRadius: rectCornerRadius).cgPath

ctx.addPath(clipPath)
ctx.setFillColor(rectBgColor.cgColor)




ctx.closePath()
ctx.fillPath()
ctx.restoreGState()

}

@muku answer in Swift 4.x+:

override func draw(_ rect: CGRect) {
  super.draw(rect)

  let clipPath = UIBezierPath(roundedRect: rect, cornerRadius: 6.0).cgPath

  let ctx = UIGraphicsGetCurrentContext()!
  ctx.addPath(clipPath)
  ctx.setFillColor(UIColor.red.cgColor)

  ctx.closePath()
  ctx.fillPath()
}