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

Question

I managed to draw a rect :-) But I don't know how to draw a rounded rect.

Can someone help me out with the following code how to round the rect?

let canvas = UIGraphicsGetCurrentContext()
rec = CGRectMake(0, 0, 40, 40);

//var maskPath = UIBezierPath(roundedRect: rec, byRoundingCorners: .BottomLeft | .BottomRight, cornerRadii: CGSize(width: 3, height: 3))

CGContextAddRect(canvas, rec);
CGContextFillPath(canvas);

Thanks, but this is reffering to rounded UIView and a rect in it. I really would like to round the rect itself. — mcfly soft
– mcfly soft, Commented May 21, 2015 at 9:13
I edit the content of my post I believe that it is what you are looking for now. — Icaro
– Icaro, Commented May 21, 2015 at 9:38

Alex Zavatone · Accepted Answer · 2021-07-24 16:44:59Z

28

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))

edited Jul 24, 2021 at 16:44

Alex Zavatone

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answered May 21, 2015 at 9:08

Icaro

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2 Comments

mcfly soft Over a year ago

Thats not what I am looking for. You do something with an UIImageView.

mcfly soft Over a year ago

Thanks a lot . I upvoted yours, because its the correct answer. I accepted mukus answer, because he was faster in replying. Thanks

Mukesh · Accepted Answer · 2017-04-04 10:33:46Z

//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()

}

I tried to translate this in swift, but I get error with converting UIBezierPath to CGPath. Could you please add missing statement in my existing code ?
clippath=(UIBezierPath(roundedRect: CGRectMake(0, 0, 0, 0), cornerRadius: 0)).CGPath
let ctx: CGContext = UIGraphicsGetCurrentContext()! ------------- when build is nil value how to fix

dimpiax · Accepted Answer · 2018-08-03 16:58:28Z

19

@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()
}

edited Aug 3, 2018 at 16:58

dimpiax

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answered Feb 28, 2016 at 9:01

Federico Zanetello

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4 Comments

William T. Mallard Over a year ago

CGPath is now cgPath

Aaron Halvorsen Over a year ago

this is not swift 4.

Papon Smc Over a year ago

let ctx = UIGraphicsGetCurrentContext()! ------------- when build is nil value how to fix

MegaManX Over a year ago

Simplest solution

dimpiax · Accepted Answer · 2020-06-09 07:53:21Z

10

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()
}

edited Jun 9, 2020 at 7:53

answered Aug 3, 2018 at 16:59

dimpiax

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Comments

Trevor · Accepted Answer · 2017-09-05 11:45:04Z

SWIFT 3.x + 4.0 I've modified the example for Swift 3 and added few lines to centralise the rectangle in the UIView

func roundRect()
{
    // Size of rounded rectangle
    let rectWidth:CGFloat = 100
    let rectHeight:CGFloat = 80

    // 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()

}

Full code with screenshots is available on: http://lab.dejaworks.com/uiview-with-rounded-background-designable-in-storyboard/

@AbdulYasin "not so surprising" pardon ? if you don't have any basic skill, you can't blame other for this. I've added a link with working code and screenshots. You can check and see what is not working for you. Regards.
@Trevor Great work, thank you! However, I am wondering if it’s possible to extend your solution so that every corner can have a different radius?

Aaron Halvorsen · Accepted Answer · 2018-05-08 14:21:40Z

3

override func draw(_ rect: CGRect) {

    let bezierPath = UIBezierPath(roundedRect: CGRect(x: 0, y: 0, width: 40.0, height: 40.0), cornerRadius: 3.0)
    UIColor.yellow.setFill()
    bezierPath.fill()

}

edited May 8, 2018 at 14:21

answered Mar 6, 2018 at 19:23

Aaron Halvorsen

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Comments

jsbox · Accepted Answer · 2023-10-29 18:05:37Z

1

The question didn't specifically exclude drawing in MacOS, so this works (MacOS 12) in Swift for drawing into a current graphic context, such as in an NSView's draw() method:

let ctx = NSGraphicsContext.current!.cgContext

ctx.setStrokeColor(NSColor.blue)

let path = NSBezierPath(roundedRect: bds, xRadius: 6.0, yRadius: 6.0)
path.lineWidth = 8.0
path.stroke()

Choose your color, radii, and linewidth according to your needs.

answered Oct 29, 2023 at 18:05

jsbox

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2 Comments

HangarRash Over a year ago

"The question didn't specifically exclude drawing in MacOS" - I have no issue with your answer but the question is tagged iOS, not macOS.

jsbox Over a year ago

You're right, I was just looking at the tile. FWIW, my Google search for "MacOS swift drawing roundrect" led to this page.

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