Cut a UIImage into a circle

by

Xcode 11 • Swift 5.1 or later

edit/update: For iOS10+ We can use UIGraphicsImageRenderer. For older Swift syntax check edit history.

extension UIImage {
    var isPortrait:  Bool    { size.height > size.width }
    var isLandscape: Bool    { size.width > size.height }
    var breadth:     CGFloat { min(size.width, size.height) }
    var breadthSize: CGSize  { .init(width: breadth, height: breadth) }
    var breadthRect: CGRect  { .init(origin: .zero, size: breadthSize) }
    var circleMasked: UIImage? {
        guard let cgImage = cgImage?
            .cropping(to: .init(origin: .init(x: isLandscape ? ((size.width-size.height)/2).rounded(.down) : 0,
                                              y: isPortrait  ? ((size.height-size.width)/2).rounded(.down) : 0),
                                size: breadthSize)) else { return nil }
        let format = imageRendererFormat
        format.opaque = false
        return UIGraphicsImageRenderer(size: breadthSize, format: format).image { _ in
            UIBezierPath(ovalIn: breadthRect).addClip()
            UIImage(cgImage: cgImage, scale: format.scale, orientation: imageOrientation)
            .draw(in: .init(origin: .zero, size: breadthSize))
        }
    }
}

Playground Testing

let profilePicture = UIImage(data: try! Data(contentsOf: URL(string:"http://i.stack.imgur.com/Xs4RX.jpg")!))!
profilePicture.circleMasked

More Related Contents:

  1. Loading/Downloading image from URL on Swift
  2. Convert between UIImage and Base64 string
  3. UIImage(contentsOfFile:) returning nil despite file existing in caches directory [duplicate]
  4. How do I resize the UIImage to reduce upload image size
  5. Swift PNG Image being saved with incorrect orientation
  6. How can I change image tintColor in iOS and WatchKit
  7. How to Resize image in Swift?
  8. How do I add text to an image in iOS Swift?
  9. How to compress of reduce the size of an image before uploading to Parse as PFFile? (Swift)
  10. Create UIImage with solid color in Swift
  11. UIImageView – How to get the file name of the image assigned?
  12. How do I take a full screen Screenshot in Swift?
  13. How do I get the color of a pixel in a UIImage with Swift?
  14. Change color of certain pixels in a UIImage
  15. Rotating UIImage in Swift
  16. Resize UIImage to 200x200pt/px
  17. How to set image for bar button with swift?
  18. Save images with phimagemanager to custom album?
  19. Get pixel data as array from UIImage/CGImage in swift
  20. How can I color a UIImage in Swift?
  21. Pixel Array to UIImage in Swift
  22. Swift playgrounds with UIImage
  23. Convert UIImage to NSData and convert back to UIImage in Swift?
  24. Set custom images to the UIBarButtonItem but it doesn’t show any image
  25. How do you create a UIImage View Programmatically – Swift
  26. How to merge two UIImages?
  27. iOS App Freezes on PushViewController
  28. update label from background timer
  29. Swift – Saving highscore using NSUserDefaults
  30. Expected declaration error for making high score [duplicate]

Leave a Comment