ios - Objective-c 清除缓存 NSCachedURLResponse

Question

我运行这段代码是因为我认为我遇到了缓存问题:

NSCachedURLResponse *response = [[NSURLCache sharedURLCache] cachedResponseForRequest:request];
    if(response){
        NSLog(@"Got Response");
    }else{
        NSLog(@"No Response");
    }

我的问题是如何清除请求 URL 的缓存？

Answer 1

NSURLRequest 有一个cachePolicy 属性，它指定请求的缓存行为。

在发出如下例所示的请求时，设置以下缓存策略 NSURLRequestReloadIgnoringLocalCacheData 将从 URL 加载数据，而不是从缓存加载数据。

NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:10];

NSURLRequestReloadIgnoringLocalCacheData

Specifies that the data for the URL load should be loaded from the originating source. No existing cache data should be used to satisfy a URL load request.

https://developer.apple.com/library/prerelease/mac/documentation/Cocoa/Reference/Foundation/Classes/NSURLRequest_Class/index.html#//apple_ref/c/tdef/NSURLRequestCachePolicy