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Simplify image management by storing your OS X icons in an asset catalog.
In the project navigator, select an asset catalog.
在项目导航区，选择一个asset catalog.
Choose Editor > New OS X Icon.
选择Editor > New OS X Icon.
An empty OS X icon set is created, with an image well for each image representation in the set.
这样就创建了一个OS X 图标集，里面有为每种图片建立的图片井。如下图：
Drag icon file from the Finder to the appropriate image well in the set viewer.
从Finder把图标文件拖入集合查看区(set viewer)的合适图片井中。
Alternatively, you can add images by selecting an asset catalog, and choosing Editor > Import.
或者，你可以通过选择一个asset catalog ,然后选择 Editor > Import 来添加图片。
Asset Catalog Help (六)---Adding OS X Icons
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原文地址：http://www.cnblogs.com/patientAndPersist/p/4428530.html
