从nsdocumentdirectory为uitableviewcells延迟加载图像?

看看 SDWebImage 储存库。它提供了执行异步映像加载的所有功能。

更新

我刚注意到自述文件中有一些拼写错误,因此下载本地文件可能无法按预期工作。

这是一些示例代码。视图控制器有一个uiImageView出口,希望加载 image.jpg 文件。它实现了 SDWebImageManagerDelegate 协议:

- (IBAction)loadImage:(id)sender {
    SDWebImageManager *manager = [SDWebImageManager sharedManager];

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *destPath = [documentsDirectory stringByAppendingPathComponent:@"image.jpg"];
    NSURL *url = [NSURL fileURLWithPath:destPath];
    UIImage *cachedImage = [manager imageWithURL:url];
    if (cachedImage)
    {
        imageView.image = cachedImage;
    }
    else
    {
        // Start an async download
        [manager downloadWithURL:url delegate:self];
    }    
}

- (void)webImageManager:(SDWebImageManager *)imageManager didFinishWithImage:(UIImage *)image
{
    imageView.image = image;
}