Created
March 23, 2016 11:31
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Change cache control headers
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| // | |
| // ViewController.swift | |
| // CacheDelegate | |
| // | |
| // Created by Heng, William (Mobile Developer) on 23/03/2016. | |
| // Copyright © 2016 Heng, William (Mobile Developer). All rights reserved. | |
| // | |
| import UIKit | |
| class ViewController: UIViewController { | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| let urlString = "ANY URL THAT RETURNS JSON" | |
| let myDelegate = MySessionDataDelegate(shouldChangeCache: true) | |
| let session = NSURLSession(configuration: NSURLSessionConfiguration.defaultSessionConfiguration() , delegate: myDelegate, delegateQueue: nil) | |
| let url = NSURL(string: urlString)! | |
| let request = NSURLRequest(URL: url, cachePolicy: NSURLRequestCachePolicy.UseProtocolCachePolicy, timeoutInterval: 60) | |
| for _ in 0...3 { | |
| let dataTask = session.dataTaskWithRequest(request) | |
| dataTask.resume() | |
| sleep(1) | |
| } | |
| } | |
| class MySessionDataDelegate : NSObject, NSURLSessionDataDelegate { | |
| var shouldChangeCache = false | |
| init(shouldChangeCache : Bool) { | |
| self.shouldChangeCache = shouldChangeCache | |
| } | |
| func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, willCacheResponse proposedResponse: NSCachedURLResponse, completionHandler: (NSCachedURLResponse?) -> Void) { | |
| var headerFields : [String : String] = (proposedResponse.response as! NSHTTPURLResponse).allHeaderFields as! [String : String] | |
| var responseToCache : NSCachedURLResponse = proposedResponse | |
| if (shouldChangeCache) { | |
| let url = proposedResponse.response.URL! | |
| let oldHTTPResponse = (proposedResponse.response as! NSHTTPURLResponse) | |
| let statusCode = oldHTTPResponse.statusCode | |
| headerFields["Cache-Control"] = "no-cache, max-age=0" | |
| let HTTPVersion = "HTTP/1.1" | |
| let newResponse = NSHTTPURLResponse(URL: url, statusCode: statusCode, HTTPVersion: HTTPVersion, headerFields: headerFields) | |
| responseToCache = NSCachedURLResponse(response: newResponse!, data: proposedResponse.data) | |
| } | |
| print("header cache: \(headerFields["Cache-Control"])") | |
| completionHandler(responseToCache) | |
| } | |
| func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveData data: NSData) { | |
| do { | |
| let myData = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.AllowFragments) | |
| print("received \(myData)") | |
| } catch { | |
| print("Cannot deserialise") | |
| } | |
| } | |
| func URLSession(session: NSURLSession, task: NSURLSessionTask, didCompleteWithError error: NSError?) { | |
| if error != nil { | |
| print("Error \(error)") | |
| } | |
| } | |
| } | |
| } |
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