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This article introduces the knowledge of "how to use swift protocol and extension". In the operation of practical cases, many people will encounter such a dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Protocol / / Protocol protocol Named {var name: String {get}} protocol Aged {var age: Int {get}} struct Person: Named, Aged {var name: String var age: Int} let p = Person (name: "zhang san" Age: 20) func wish (to: Named & Aged) {print ("name\ (to.name) age\ (to.age)")} wish (to: P) / / name zhang san age 20 Protocol extension protocol TextRepresentable {var desc: String {get} / / extension Protocol extension Person: TextRepresentable {var desc: String {return "name\ (name) age\ (age)"} extension Array: TextRepresentable where Element: TextRepresentable {var desc: String {let itemDesc = self.map {$0.desc} return itemDesc.joined (separator: " ")}} let arr = [Person (name:" zhang san ", age: 20), Person (name:" li si ", age: 25)] print (arr.desc) / / name zhang san age 20 Magi name li si age 25" how to use swift protocols and extensions "ends here Thank you for your reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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