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Update placeholder-fade-duration.md

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Hannah Troisi
2016-07-22 00:04:49 -07:00
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@@ -16,6 +16,7 @@ For image drawing, use the node's `.calculatedSize` property.
The <code>-placeholderImage</code> function may be called on a background thread, so it is important that this function is thread safe. Note that <code>-[UIImage imageNamed:]</code> is not thread safe when using image assets. Instead use <code>-[UIImage imageWithContentsOfFile:]</code>.
</div>
An ideal resource for creating placeholder images, including rounded rect solid colored ones or simple square corner ones is the UIImage+ASConvience category methods in ASDK.
See our ancient <a href="https://github.com/facebook/AsyncDisplayKit/tree/master/examples_extra/placeholders">Placeholders sample app</a> to see this concept, first invented by the Facebook Paper team, in action.