Question

我正在使用集合视图来显示每个单元格中的产品数据。每次用户刷新collectionview时，它都会再次从服务器获取数据。

我需要知道是否有可用于缓存下载图像的缓存机制。我只想下载最近更新的未缓存的产品。

NSURL *url = [NSURL URLWithString:@"http://www.myURL/productAll.php"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
    NSError *myError = nil;
    id res = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:&myError];        
    items = [[NSMutableArray alloc] init];
    for (int i=0; i<[res count]; i++) {
        NSString *arrayResult = [[res objectAtIndex:i]objectForKey:@"image"];            
        NSData *data = [[NSData alloc] initWithBase64EncodedString:arrayResult options:NSDataBase64DecodingIgnoreUnknownCharacters];
        UIImage *captcha_image = [[UIImage alloc] initWithData:data];
        [items addObject:captcha_image];
    }
    [collectionView reloadData];
}];

Answer 1

使用NSURLCache设置内存和磁盘缓存，如下所示：

int cacheSizeMemory = xxxxx; //in memory cache
int cacheSizeDisk = xxxxx; //disk cache
NSURLCache *sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:cacheSizeMemory diskCapacity:cacheSizeDisk diskPath:@"nsurlcache"];
[NSURLCache setSharedURLCache:sharedCache];

缓存下载的数据

1 个答案: