如何在Swift 3中绘制一个圆圈

Question

Swift 3 如何制作一个圆圈？圆圈应位于中心.确定半径.背景 - blackblur.谢谢

Answer 1

为了使圆形绘制一个正方形并添加一个等于width/2的cornerRadius:

let circle = UIView(frame: CGRect(x: 0.0, y: 0.0, width: 100.0, height: 100.0))

circle.center = self.view.center
circle.layer.cornerRadius = 50
circle.backgroundColor = UIColor.black
circle.clipsToBounds = true


var darkBlur = UIBlurEffect(style: UIBlurEffectStyle.dark)
var blurView = UIVisualEffectView(effect: darkBlur)

blurView.frame = circle.bounds

circle.addSubview(blurView)
self.view.addSubview(circle)

祝好运!:)