Shulou(Shulou.com)06/03 Report--

This article focuses on "how to use swift-like polymorphism", interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to use swift class polymorphism.

Polymorphic / / polymorphic 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 down type conversion as// to down type conversion asfor item in items {if let real = item as? Movie {real.show () / / movie name is A, director is B}} at this point, I believe you have a better understanding of "how to use swift class polymorphism". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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