缓存NSCash

1\获取所有的缓存数据

NSURLCache *cache = [NSURLCache sharedURLCache];

2\获取某一request对应的缓存

NSCachedURLResponse *respose = [cache cachedResponseForRequest:request];

3\缓存有一属性NSData.通过response.data获取缓存数据

4\清除缓存

- (void)removeCachedResponseForRequest:(NSURLRequest *)request;

 

- (void)removeAllCachedResponses;