Customizing Image Sets for Size Classes
Add images to a set that are customized for display in different size classes supported by your app.
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In the set list, select an image set.
在集合列表(set list)中，选择一个图片集。
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Open the utilities area for the workspace window by clicking the Show Utilities button (
).点击(
)显示工作区窗口的工具区(utilities area). -
In the inspector bar, click the Attributes Inspector button (
).在inspector 栏，点击属性检查按钮 (
)。 -
Choose Universal from the Device pop-up menu.
在设备弹出菜单那选择Universal.
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Choose a specific size class from the Width or Height size pop-up menu or from both.
在width 或者Height弹出菜单中选择一个指定的尺寸类(size class)。
After you choose a size class, Xcode adds placeholders for image files in the set viewer area.
选择完成后,Xcode 在图片集查看区(set viewer)为图片文件添加占位符。
The size class settings for a placeholder image are shown in coded format following the size of the image. The format is [horizontal size class, vertical size class]. Each size class can be one of three values:
size class(尺寸类) 为一个占位图片的格式是把图片的尺寸以编码格式显示。 格式为[横向尺寸类 纵向尺寸类]. 每个尺寸类 可以是以下三个值中的一个：
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Any size class 任何尺寸类 |
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Regular size class 常规尺寸类 |
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Compact size class 紧凑尺寸类 |
For example, 
is a 2x resolution image used with a compact horizontal size class and any vertical size class.
比如， 2x[- *] 是一个2倍分辨率图片，它的尺寸类是紧凑横向尺寸类和纵向任何尺寸类。