GCD异步加载网络图片

//image

dispatch_queue_t network_queue;

network_queue = dispatch_queue_create("com.myapp.network", nil);

dispatch_async(network_queue, ^{

UIImage *cellImage = [self loadMyImageFromNetwork:[self.content objectAtIndex:indexPath.row]];

//缓存到本地

// 回到主线程

dispatch_async(dispatch_get_main_queue(), ^{

// 显示图片到界面

cell.imageView.image = cellImage;

[cell setNeedsLayout];

});

} );

demo地址：demo