Alamofire缓存数据篇mark

许多app需要在无网络的情况下缓存数据，做法记录一下
1.创建特定的config sessionmanager

let netmanager: SessionManager = {
    let configuration = URLSessionConfiguration.default
    let reachability = NetworkReachabilityManager()
    if (reachability?.isReachable)! {
        configuration.requestCachePolicy = .reloadIgnoringLocalAndRemoteCacheData
    }else
    {
        configuration.requestCachePolicy = .returnCacheDataElseLoad
    }
    return Alamofire.SessionManager(configuration: configuration)
}()

2.appdelegate中开启缓存

     NetworkReachabilityManager.init()?.startListening()
    let urlCache = URLCache.init(memoryCapacity: 4*1024*1024, diskCapacity: 20*1024*1024, diskPath: nil)
    URLCache.shared = urlCache

3.使用 alamofire.request 统一换成netmanager.request 即可