2
封闭使用非转义参数可能会使它转义
我有一个协议： enum DataFetchResult { case success(data: Data) case failure } protocol DataServiceType { func fetchData(location: String, completion: (DataFetchResult) -> (Void)) func cachedData(location: String) -> Data? } 通过示例实现： /// An implementation of DataServiceType protocol returning predefined results using arbitrary queue for asynchronyous mechanisms. /// Dedicated to be used in various tests …