Adding an iOS App Icon Set or Launch Image Set
Organize different resolutions of your app icons and launch images using image sets.
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Select an asset catalog.
选择一个asset catalog.
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Choose Editor > New App Icon.
选择Editor > New App Icon.
An empty app icon set is created, with an image well for each image representation in the set.
一个空应用程序图标集被创建，在集合中为每种图标代表都准备了一个图片井。
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Drag an app icon from the Finder to the appropriate image well in the set viewer.
从Finder中把应用图标拖入图片集查看区(set viewer)合适的图片井中。
Alternatively, you can add app icons by selecting an asset catalog, and then choosing Editor > Import.
或者，你可以通过选择一个asset catalog，然后选择Editor > Import添加应用图标。
To add a launch image set, choose Editor > New Launch Image and follow the steps described above, substituting launch images for app icons. Instead of a set of launch images, if your app targets at least iOS 8 you can use one launch screen file. This is a xib file that can adapt to any screen size or orientation. For more information, see Creating a Launch Screen File.
要想添加一个启动图片集，选择Editor > New Lauch Image,并跟随上面描述的步骤，把应用图片替换成启动图片即可。如果你的目标在iOS8 或者以上版本，你可以使用一个启动屏幕文件(launch screen file)来替代启动图片集。启动屏幕文件是一个xib文件，它能适应任何屏幕尺寸或方法。更多信息，请看 Creating a Launch Screen File.
