ios - NSURLCache Alamofire 删除缓存的响应
<p><p>我正在使用以下代码来测试 <code>NSURLCache</code> 中的行为。我在 <code>AppDelegate</code> 中初始化了一个 <code>API</code> 实例。我根据 Alamofire 的文档配置管理器，配置共享缓存，并分配 <code>dataTaskWillCacheResponse</code> 以确保响应确实会被缓存。</p>
<p>然后我调用 <code>makeRequest</code> 来检查缓存的响应是否存在(它不应该在第一次启动时)，然后我使用我的 <code>manager</code> 发出请求相同的 URL，以便请求在整个测试过程中是等效的。</p>
<p>我在 <code>dataTaskWillCacheResponse</code> 的断点被命中，我继续，<code>responseJSON</code>block 被执行并且是 <code>Success</code>ful 所以我 <code>performTests</code> 使用请求。</p>
<ol>
<li>首先，我检查响应是否被缓存。 <strong>很好!</strong></li>
<li>第二，<strong>(这就是问题所在)</strong>我删除了该请求的缓存响应，然后检查它是否存在。 <strong>确实如此:糟糕!</strong></li>
<li>第三，我检查删除 <em>all</em> 缓存的响应是否会删除该响应。 <strong>确实:好! <em>但奇怪的是，这行得通，而之前尝试仅删除单个响应并没有...</em></strong></li>
</ol>
<h3>代码如下:</h3>
<pre><code>import Alamofire
class API: Manager.SessionDelegate {
var manager: Manager!
override init() {
super.init()
manager = Manager(session: urlSession(), delegate: self)
configureCache(memoryCapacityMB: 5, diskCapacityMB: 25)
manager.delegate.dataTaskWillCacheResponse = { urlSession, dataTask, cachedResponse in
// Placing a breakpoint here confirms that the response is going to be cached
return cachedResponse
}
}
private func urlSession() -> NSURLSession {
let configuration = NSURLSessionConfiguration.defaultSessionConfiguration()
return NSURLSession(configuration: configuration, delegate: self, delegateQueue: nil)
}
private func configureCache(memoryCapacityMB memory: Int, diskCapacityMB disk: Int) {
let memoryCapacity = memory * 1024 * 1024
let diskCapacity = disk * 1024 * 1024
let sharedCache = NSURLCache(memoryCapacity: memoryCapacity, diskCapacity: diskCapacity, diskPath: nil)
NSURLCache.setSharedURLCache(sharedCache)
}
// MARK: Request
func makeRequest() {
// The response should be nil on the first launch since nothing has been cached
let request = NSURLRequest(URL: NSURL(string: "http://jsonplaceholder.typicode.com/posts")!)
let response = NSURLCache.sharedURLCache().cachedResponseForRequest(request)
print(response)
manager.request(.GET, request.URLString).responseJSON { response in
switch response.result {
case .Success:
self.performTests(with: response.request!)
case .Failure:
break
}
}
}
func performTests(with request: NSURLRequest) {
// Should exist
var response = NSURLCache.sharedURLCache().cachedResponseForRequest(request)
print(response)
// And it does: good!
// Remove the cached resopnse and check if it exists
NSURLCache.sharedURLCache().removeCachedResponseForRequest(request)
response = NSURLCache.sharedURLCache().cachedResponseForRequest(request)
print(response)
// And it does: bad!
// Try removing all cached responses and check if it exists
NSURLCache.sharedURLCache().removeAllCachedResponses()
response = NSURLCache.sharedURLCache().cachedResponseForRequest(request)
print(response)
// And it doesn't: good! But odd...
}
}
</code></pre>
<p><strong>那么<em>如何</em>删除单个请求的缓存响应呢？</strong>这是意外行为吗？还是 <code>NSURLCache</code> 行为正确而我只是遗漏了一些东西？提前感谢您查看!</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>我记得大多数 URL 缓存更改不是同步的。它们仅在您返回运行循环并允许发生各种异步回调后才会真正发生。</p>
<p>尝试在延迟 3-5 秒后异步运行其余代码，看看请求是否已被删除。</p>
<p>如果这不能解决问题，请提交错误。</p></p>
<p style="font-size: 20px;">关于ios - NSURLCache Alamofire 删除缓存的响应，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/38729214/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/38729214/
</a>
</p>
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