- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { // 缓存会自动存到以下这个文件夹中,创建三个文件,其中db文件可以使用数据库打开 NSString * tem = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject]; NSLog(@"%@", tem); // 开始请求数据 NSString * path = @"http://localhost/netTest.html"; NSURL * url = [NSURL URLWithString:path]; NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url]; // 设置缓存机制,只要这一句代码就可以了 request.cachePolicy = NSURLRequestReturnCacheDataElseLoad; [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) { NSString * str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; NSLog(@"%@", str); }]; // 缓存的清理 NSURLCache * caches = [NSURLCache sharedURLCache]; NSCachedURLResponse * response = [caches cachedResponseForRequest:request]; if (response == nil) { NSLog(@"没有缓存"); } else { NSLog(@"有缓存"); [caches removeAllCachedResponses]; } }