Swift学习小结之协议和扩展

import UIKit

var str = "Hello,playground"
// 协议和扩展
protocol ExampleProtocol {
    var simpleDescription:String {get}
    mutating func adjust()
}
class simpleClass: ExampleProtocol {
    var  simpleDescription: String = "A very simple class"
    var  anotherProperty:Int = 69105
   func adjust() {
      simpleDescription += "Now 100% adjusted"
    }
}
var a = simpleClass()
a.adjust()
let aDescription  = a.simpleDescription

struct  SimpleStructure:ExampleProtocol {
    var simpleDescription: String = "A simple structure"
    mutating func adjust() {
        simpleDescription += " (adjusted)"
    }
}
var b = SimpleStructure()
b.adjust()
let bDescription = b.simpleDescription


extension Int : ExampleProtocol{

    var simpleDescription: String{
    
    return "The number \(self)"
    }
    mutating func adjust() {
        self += 42
    }


}