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let gradientLayer = CAGradientLayer() gradientLayer.frame = self.view.frame gradientLayer.colors = [

1: var beginPoint = CGPoint.zero 2: override func touchesBegan(_ touches: Set< UITouch >, with event

let date = Date() let dateFormatter = DateFormatter() dateFormatter.dateFormat = "yyyy:MM:dd HH: mm

static 修饰的属性与方法不可被重写 class 不可修饰存储属性，修饰的计算属性和方法可以被重写 class var flowerNumber:Int { return 5 } class fu

"nameText":"三九幺幺",                               "peopleIcon":"peopleIcon",                        

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protocol Name { var myName:String? (get set) } protocol Age { var myAge:Int? (get set) } class Cat:N

1:用角度获取圆环上，点的位置 func getPointWithAngle(_ angle:CGFloat) -> CGPoint { let x = radius * cos(angle) let

1: let queue = DispatchQueue.global(qos:DispatchQoS.QoSClass.default) queue.async{ self.perdorm(#sel