如何编写协议扩展以从Swift枚举中获取所有rawValues
发布时间:2020-12-14 02:25:15 所属栏目:百科 来源:网络整理
导读:我要做的是创建一个协议扩展来从枚举中获取原始值数组.例如,说我有以下内容: enum TestType: String,EnumIteratable { case unitTest = "Unit Test" case uiTest = "UI Test"}class EnumIterator: NSObject { class func iterateEnumT: Hashable(_: T.Type)
我要做的是创建一个协议扩展来从枚举中获取原始值数组.例如,说我有以下内容:
enum TestType: String,EnumIteratable { case unitTest = "Unit Test" case uiTest = "UI Test" } class EnumIterator: NSObject { class func iterateEnum<T: Hashable>(_: T.Type) -> AnyGenerator<T> { var i = 0 return anyGenerator { let next = withUnsafePointer(&i) { UnsafePointer<T>($0).memory } return next.hashValue == i++ ? next : nil } } class func getValues<T: Hashable>(_: T.Type) -> [T] { let iterator = self.iterateEnum(T) var returnArray = [T]() for val in iterator { returnArray.append(val) } return returnArray } } 我如何实现协议EnumIteratable,以便我可以调用TestType.getRawValues()并让它返回所有原始枚举值的字符串数组? 谢谢!
您只需添加一个静态属性即可返回所有枚举值.例如:
enum RelationshipStatus: String { case Single = "Single" case Married = "Married" case ItsComplicated = "It's complicated" static let all: [RelationshipStatus] = [.Single,.Married,.ItsComplicated] } for status in RelationshipStatus.all { print(status.rawValue) } (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |