ios - 设置缓存时间 AFNetworking swift 2

Question

我正在使用代码 AFNetworking 加载数据

let manager = AFHTTPRequestOperationManager()
    manager.requestSerializer.cachePolicy = NSURLRequestCachePolicy.ReturnCacheDataElseLoad
    manager.responseSerializer = AFHTTPResponseSerializer()

    let testUrl = "https://www.google.com/maps/vt/pb=!1m8!3m7!1m2!1u2816!2u5888!2m2!1u1536!2u512!3i6!2m3!1e0!2sm!3i333!2m20!1e2!2spsm!4m2!1sgid!2sWejnA6yw2AIgHrbvnAUOAg!4m2!1ssp!2s1!8m11!13m9!2sa!15b1!18m5!2b1!3b0!4b1!5b0!6b0!19b1!19u12!3m2!2sen!5e1105!4e4!11m2!1e2!2b1&authuser=0"

    manager.GET(testUrl,
            parameters: nil,
            success: { (operation: AFHTTPRequestOperation!, responseObject: AnyObject!) in
                print("afnetworking GET success1")
            },
            failure: { (operation: AFHTTPRequestOperation?,error: NSError!) in
                print("afnetworking GET 1  - Error: " + error.localizedDescription)
        })

当数据在缓存中时，它会从缓存中给我数据...没问题，
但我怎么能
1)- 设置缓存策略，只缓存1小时
2)- 当服务器没有缓存 header 时它不缓存，对于这种情况也将数据缓存一个小时。

Answer 1

对于来自 Swift 宗教的人，我编写了 AFHTTPSessionManager 扩展，其中包含从 AFNetworking 3.0< 调用 self.setDataTaskWillCacheResponseBlock: 的方法 并修改 Cache-Control 响应 header value :

extension AFHTTPSessionManager {
  //duration in seconds
  func forceCacheResponse(duration:Int) {
    self.setDataTaskWillCacheResponseBlock({
      (session:NSURLSession, task:NSURLSessionDataTask, proposedResponse:NSCachedURLResponse) -> (NSCachedURLResponse) in
      if let response = proposedResponse.response as? NSHTTPURLResponse {
        var headers = response.allHeaderFields as! [String:String]
        headers["Cache-Control"] = String(format: "max-age=%@", arguments: [duration])

        let modifiedResponse = NSHTTPURLResponse(URL: response.URL!, statusCode: response.statusCode, HTTPVersion: "1.1", headerFields: headers)
        if (modifiedResponse != nil) {
          let cachedResponse = NSCachedURLResponse(response: modifiedResponse!, data: proposedResponse.data, userInfo: proposedResponse.userInfo, storagePolicy: NSURLCacheStoragePolicy.Allowed)
          return cachedResponse
        }
      }

      return proposedResponse
    })
  }
}

现在你的用法非常简单:

let manager = AFHTTPSessionManager()
manager.forceCacheResponse(604800)