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检测UIImage是否已预加载？

[英]Detect if UIImage is preloaded?

原文 2013-06-05 23:16:37 4 1 ios/ uiimage

I am working on an image viewer application. 我正在研究图像查看器应用程序。 I noticed some lag when scrolling and discovered this code to solve the problem: 我在滚动时注意到一些滞后，并发现以下代码可以解决问题：

https://gist.github.com/steipete/1144242 https://gist.github.com/steipete/1144242

Basically, it just draws the UIImage, to preload/cache it, making the scrolling nice and smooth. 基本上，它只是绘制UIImage来预加载/缓存它，从而使滚动变得顺畅流畅。

Is there anyway to detect whether a given UIImage is preloaded? 无论如何，有没有检测给定的UIImage是否已预加载？

1 个解决方案

Asked at WWDC, there isn't a way to tell. 在WWDC上被问到，没有办法说出来。 So I used associated objects attached to my UIImage to track whether it was preloaded or not. 因此，我使用附加到UIImage的关联对象来跟踪它是否已预加载。

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