编辑代码

import UIKit

class Shape{
    //名称
    var name: String?
    //边数
       var sides  : Int?
    //左上角的位置坐标
    var origin   : CGPoint?
    //线条颜色
    var lineColor  :  UIColor= UIColor.red
    //填充颜色
    var fillColor : UIColor=UIColor.green
    //线条宽度
    var lineWidth :   CGPLoat=2
    //构造器函数init
    init(name : String, sides:Int,origin: CGPoint){
        self.naem=name
        self.sides=sides
        self.origin=origin
    }
    //自定义方法sayHello
    func sayHello(){
        print("Shape is \(name!),sides \(sides!),and originCord is (\origin!.x),\(origin!.y)")
    }
}

class CzfView: UIView{
    //成员变量（属性）shape，其类型为Shape
    var shape : Shape?
    //重载UIView的draw方法
    override func draw(_rect: CGRect){
        //判断shape变量是否为空值nil
        guard let s =shape else{
            return
        }
        //不为空，则调用shape这个实力方法
        s.sayHello()
    }
}

class ViewController: UIViewController{
     
     override func viewDidLoad(){
         super.viewDidLoad()
         //Do any additional step after loading the view, typically  from a nib.
         //此处建立了一个CzfView的实例myShape
         let myShape =Shape(name:"BaseShape",sides: 0,origin: CGPoint(x: 0, y: 0) )
         //赋值给myView中的成员变量（属性）shape
         myView.shape = myShape
         //显示myView
         self.view.addSubview(myView)

     }
}