AsyncDisplayKit 图像显示闪烁

Question

我正在尝试结合使用 facebook 的 AsyncDisplayKit 和 DMLazyScrollView。移动到 next/previous 图像时，视图会闪烁，如下所示：

没有AsyncDisplayKit，就不会出现这个问题。

这是负责获取图像的代码部分：

- (UIViewController *) controllerAtIndex:(NSInteger) index {
    if (index > viewControllerArray.count || index < 0) return nil;
    id res = [viewControllerArray objectAtIndex:index];
    if (res == [NSNull null]) {
        UIViewController *contr = [[UIViewController alloc] init];

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
            ASNetworkImageNode *_mediaNode = [[ASNetworkImageNode alloc] init];
            _mediaNode.backgroundColor = ASDisplayNodeDefaultPlaceholderColor();
            _mediaNode.URL = [NSURL URLWithString:[imagesUrl objectAtIndex:index]];
            _mediaNode.frame = contr.view.bounds;

            dispatch_async(dispatch_get_main_queue(), ^{
                [contr.view addSubview:_mediaNode.view];
            });
        });
        [viewControllerArray replaceObjectAtIndex:index withObject:contr];
        return contr;
    }
    return res;
}

很高兴知道是否有人解决了这个问题。

Answer 1

开始吧，这是闪烁原因的答案：

When converting an app to use AsyncDisplayKit, a common mistake is to add nodes directly to an existing view hierarchy. Doing this will virtually guarantee that your nodes will flash as they are rendered.

async display kit docs

AsyncDisplayKit 图像显示闪烁

AsyncDisplayKit Image Display Blinks

ios

asyncdisplaykit