blocks|key|2999356|text|NSURLCache根据来自服务器的缓存响应、缓存配置和请求的缓存策略，自动缓存通过NSURLConnection和UIWebView发出的请求。这些响应在缓存的生命周期内存储在内存和磁盘上。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2999357|2999358|一旁|2999359|我用下面的代码验证了这个行为。您不需要在自己的代码中使用以下任何内容。这只是为了演示我是如何确认这种行为的。|BOLD|2999360|-+(BOOL)application:(UIApplication+*)application+didFinishLaunchingWithOptions:(NSDictionary+*)launchOptions
{
++++//+Prime+the+cache.
++++[NSURLCache+sharedURLCache];
++++sleep(1);+//+Again,+this+is+for+demonstration+purposes+only.+I+wouldn't+do+this+in+a+real+app.

++++//+Choose+a+long+cached+URL.
++++NSURLRequest+*request+=+[[NSURLRequest+alloc]+initWithURL:[NSURL+URLWithString:@"http://cdn.sstatic.net/stackoverflow/img/favicon.ico"]];

++++//+Check+the+cache.
++++NSCachedURLResponse+*cachedResponse+=+[[NSURLCache+sharedURLCache]+cachedResponseForRequest:request];
++++NSLog(cachedResponse+?+@"Cached+response+found!"+:+@"No+cached+response+found.");

++++//+Load+the+file.
++++[NSURLConnection+sendSynchronousRequest:request+returningResponse:NULL+error:NULL];

++++return+YES;
}|code-block|syntax|javascript|2999361|代码执行以下操作：|2999362|2999363|启动缓存。我注意到一种行为，在缓存初始化并有机会扫描磁盘之前，缓存不会返回缓存的结果。|ordered-list-item|2999364|创建对长缓存文件的请求。|2999365|检查是否存在对该URL的响应，并显示status.|2999366|Loads+the+URL。|2999367|2999368|在第一次加载时，您应该看到“没有找到缓存的响应”。在随后的运行中，您将看到“找到缓存的响应！”|2999369|entityMap^0|0|A|16|F|1M|9|0|0|0|F|13|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|17|8|@$9|18|A|19|B|C]|$9|1A|A|1B|B|C]|$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|1E|8|@]|D|@]|E|$]]|$1|G|3|H|5|6|7|1F|8|@]|D|@]|E|$]]|$1|I|3|J|5|6|7|1G|8|@$9|1H|A|1I|B|K]]|D|@]|E|$]]|$1|L|3|M|5|N|7|1J|8|@]|D|@]|E|$O|P]]|$1|Q|3|R|5|6|7|1K|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1L|8|@]|D|@]|E|$]]|$1|T|3|U|5|V|7|1M|8|@]|D|@]|E|$]]|$1|W|3|X|5|V|7|1N|8|@]|D|@]|E|$]]|$1|Y|3|Z|5|V|7|1O|8|@]|D|@]|E|$]]|$1|10|3|11|5|V|7|1P|8|@]|D|@]|E|$]]|$1|12|3|-4|5|6|7|1Q|8|@]|D|@]|E|$]]|$1|13|3|14|5|6|7|1R|8|@]|D|@]|E|$]]|$1|15|3|-4|5|6|7|1S|8|@]|D|@]|E|$]]]|16|$]]

<code>NSURLCache</code> automatically caches requests for requests made over <code>NSURLConnection</code> and <code>UIWebView</code>s according to the cache response from the server, the cache configuration, and the request's cache policy. These responses are stored in memory and on disk for the lifetime of the cache.

<hr>

<h3>Aside</h3>

I validated the behavior with the following code. You do not need to use any of the below in your own code. This is just to demonstrate how I confirmed the behavior.

<pre><code>- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
 // Prime the cache.
 [NSURLCache sharedURLCache];
 sleep(1); // Again, this is for demonstration purposes only. I wouldn't do this in a real app.

 // Choose a long cached URL.
 NSURLRequest *request = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://cdn.sstatic.net/stackoverflow/img/favicon.ico"]];

 // Check the cache.
 NSCachedURLResponse *cachedResponse = [[NSURLCache sharedURLCache] cachedResponseForRequest:request];
 NSLog(cachedResponse ? @"Cached response found!" : @"No cached response found.");

 // Load the file.
 [NSURLConnection sendSynchronousRequest:request returningResponse:NULL error:NULL];

 return YES;
}
</code></pre>

The code does the following:

<ol>
<li>Primes the cache. I noticed a behavior where the cache would not return the cached result until the cache had been initialized and had a chance to scan the disk.</li>
<li>Creates a request for a long-cached file.</li>
<li>Checks if a response exists for the URL and displays the status.</li>
<li>Loads the URL.</li>
</ol>

On first load, you should see "No cached response found." On subsequent runs, you will see "Cached response found!"

I'm looking for a network caching solution for my iOS application that is persistent across launches. I started to read about NSURLCache, but didn't see any mention regarding persistence. Does anyone know how this behaves when you use NSURLCache then close and open the app? Does it persist?

Is NSURLCache persistent across launches?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在寻找一种适用于我的iOS应用程序的网络缓存解决方案，它可以在启动过程中持久存在。我开始阅读有关NSURLCache的文章，但没有看到任何关于持久性的提及。有人知道当你使用NSURLCache然后关闭和打开应用程序时，这是如何表现的吗？这种情况会持续下去吗？

NSURLCache是否会在发布过程中持续存在？-腾讯云开发者社区-腾讯云

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