The most performant way is to add an image that is round. Setting thecornerRadius will work, but it is a performance hog and it's an overkill for a simple colored circle.

if height & width = 50

   View.clipsToBounds = true   View.layer.cornerRadius= View.frame.size.width/2

You can make a view that adds aCAShapeLayer with a circle:

@IBDesignable class CircleView: UIView {    @IBInspectable public var fillColor:   UIColor = #colorLiteral(red: 0, green: 0, blue: 1, alpha: 1)  { didSet { shapeLayer.fillColor = fillColor.cgColor } }    @IBInspectable public var strokeColor: UIColor = #colorLiteral(red: 1, green: 1, blue: 1, alpha: 0)  { didSet { shapeLayer.strokeColor = strokeColor.cgColor } }    @IBInspectable public var lineWidth:   CGFloat = 0   { didSet { setNeedsLayout() } }    lazy private var shapeLayer: CAShapeLayer = {        let _shapeLayer = CAShapeLayer()        _shapeLayer.fillColor = self.fillColor.cgColor        _shapeLayer.strokeColor = self.strokeColor.cgColor        self.layer.insertSublayer(_shapeLayer, at: 0)        return _shapeLayer    }()    override func layoutSubviews() {        super.layoutSubviews()        let center = CGPoint(x: bounds.midX, y: bounds.midY)        let radius = (min(bounds.size.width, bounds.size.height) - lineWidth) / 2        shapeLayer.path = UIBezierPath(arcCenter: center, radius: radius, startAngle: 0, endAngle: .pi * 2, clockwise: true).cgPath        shapeLayer.lineWidth = lineWidth    }}

Note, that is@IBDesignable, so you'll be able to use it in Interface Builder. Just create a separate target ("File" - "New" - "Target...") and choose "Cocoa Touch Framework" and give it an appropriate name (e.g. if your app is "Foo", you'd call this framework "FooKit"). Then add the aboveUIView subclass to that framework, and you can reference this class in IB (just add aUIView object and change its base class toCircleView):

Add a UIView instance and set itslayer.cornerRadius to half its width/height.

class CircularImageView: UIImageView {override func layoutSubviews() {    super.layoutSubviews()    let radius: CGFloat = self.bounds.size.width / 2.0    self.layer.cornerRadius = radius    self.clipsToBounds = true} }

you can also make a circular image view which is subclass of UIImageView so you can set it directly to UIImageView...

• swift
• xcode
• uitableview
• shapes