Swift_继承

Swift_继承

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func testInheritance() {

    //基类
    class Base {
        var count = 0.0
        var description: String {
            return "count:\(count)"
        }

        //可继承
        func inherited() {

        }

        //防止继承
        final func preventing() {
            //如果不想子类继承 可在类 属性或方法前添加final
        }
    }

    //子类
    class Subclass: Base {

        //继承的属性和方法前都有override
        override var count:Double {
            didSet {
                print("\(#function)")
            }
        }

        override var description: String {
            return "\(#function)" + super.description
        }

        override func inherited() {
            print("\(#function)")
        }
    }

    let subclass = Subclass()

    subclass.count = 10
    print("\(subclass.description)")
    subclass.inherited()

    /*  print

     count
     descriptioncount:10.0
     inherited()

     */
}