Apple官方文檔：The Swift Programming Language
Protocols and Extensions一節的小節練習，要求自行定義一個enumeration枚舉類型，并且遵循ExampleProtocol協議：
protocol ExampleProtocol {var simpleDescription: String { get }mutating func adjust() }
在網上找了好久，都不知道怎樣實現，最后參照一篇帖子（http://forums.macrumors.com/showthread.php?t=1740890），最終實現如下：
enum EnumConformToProtocol: ExampleProtocol {case First(String), Second(String), Third(String)var simpleDescription: String {get {switch self {case let .First(text):return textcase let .Second(text):return textcase let .Third(text):return textdefault:return "get error"}}set {switch self {case let .First(text):self = .First(newValue)case let .Second(text):self = .Second(newValue)case let .Third(text):self = .Third(newValue)}}}mutating func adjust() {switch self {case let .First(text):self = .First(text + " (first case adjusted)")case let .Second(text):self = .Second(text + " (second case adjusted)")case let .Third(text):self = .Third(text + " (third case adjusted)")}} }var enumConformToProtocolTest = EnumConformToProtocol.First("FirstVal") enumConformToProtocolTest.simpleDescription enumConformToProtocolTest.adjust() enumConformToProtocolTest.simpleDescriptionenumConformToProtocolTest = EnumConformToProtocol.Third("ThirdVal") enumConformToProtocolTest.simpleDescription enumConformToProtocolTest.adjust() enumConformToProtocolTest.simpleDescriptionvar e = EnumConformToProtocol.Second("Hello") var text = e.simpleDescription e.simpleDescription = "Adios" text = e.simpleDescription e.adjust() text = e.simpleDescription
運行結果截圖：

轉載于:https://www.cnblogs.com/sesexxoo/p/6189924.html

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