swift - 尝试使用 Alamofire 缓存但没有结果

Question

我正在尝试使用 Alamofire 缓存，所以我想要的行为是第一次从网络加载，下次如果数据存在于缓存中则返回它而不发出更多请求......在我考虑过期之后...

我的代码总是返回响应 nil...对此有什么建议吗？谢谢

    let config = NSURLSessionConfiguration.defaultSessionConfiguration()
    config.URLCache = NSURLCache.sharedURLCache()
    config.requestCachePolicy = NSURLRequestCachePolicy.ReturnCacheDataElseLoad
    let manager = Alamofire.Manager(configuration: config)
    manager.request(.GET, url, parameters: parameters, encoding: .URL, headers: ["Token":LocalStorage.read("token") as! String, "Version":"2"]).responseJSON { (response) in

        if let json = response.result.value
        {
            if response.response?.statusCode == 200
            {
                completionHandler(parser.parseSwifty(JSON(json)), nil)
            }
            else
            {
                completionHandler(nil, serverErrorMessage)
            }
        }
        else
        {
            completionHandler(nil, networkErrorMessage)
        }

    }

Answer 1

所以...我解决了这个问题: 在我的 NetworkHelper 中，我添加了一个计算属性，如下所示:

    static let manager: Manager = {
    let memoryCapacity = 100 * 1024 * 1024; // 100 MB
    let diskCapacity = 100 * 1024 * 1024; // 100 MB
    let cache = NSURLCache(memoryCapacity: memoryCapacity, diskCapacity: diskCapacity, diskPath: "shared_cache")

    let configuration: NSURLSessionConfiguration = NSURLSessionConfiguration.defaultSessionConfiguration()
    configuration.HTTPAdditionalHeaders = ["Token":LocalStorage.read("token") as! String, "Version":"2"]
    configuration.requestCachePolicy = .ReturnCacheDataElseLoad // this is the default
    configuration.URLCache = cache

    return Manager(configuration: configuration)
}()

当我必须检索一些数据时:

        self.manager.request(.GET, url, parameters: parameters, encoding: .URL)
        .response { (request, response, data, error) in
            debugPrint(request)
            debugPrint(response)
            debugPrint(error)
    }.responseJSON......

我还编写了一个函数来预加载一些数据，如下所示:

    static func preloadGetRequest(url : String, parameters: Dictionary<String, String>?)
{
    self.manager.request(.GET, url, parameters: parameters, encoding: .URL)
        .response { (request, response, data, error) in
            debugPrint(request)
            debugPrint(response)
            debugPrint(error)
    }
}

试着让我知道:)