如何使用swift类多态

本篇内容主要讲解"如何使用swift类多态"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"如何使用swift类多态"吧!

多态

//多态class Media{    var name: String        init(name: String) {        self.name = name    }        func show() {        print("name is \(name)")    }}class Movie: Media {    var director: String        init(name: String, director: String) {        self.director = director        super.init(name: name)    }        override func show() {        print("movie name is \(name), director is \(director)")    }}class Song: Media {    var artist: String        init(name: String, artist: String) {        self.artist = artist        super.init(name: name)    }        override func show() {        print("song name is \(name), artist is \(artist)")    }}let items = [    Movie(name: "A", director: "B"),    Song(name: "C", artist: "D")]print(type(of: items))//Array

向下类型转换 as

//向下类型转换 asfor item in items {    if let real = item as? Movie {        real.show()        //movie name is A, director is B    }}

到此，相信大家对"如何使用swift类多态"有了更深的了解，不妨来实际操作一番吧！这里是网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！