Drawing the layout is a two pass process: a measure pass and a layout pass.
布局绘画涉及两个过程：测量过程和布局过程。
Your application will perform better by reducing as much as possible any unnecessary invocations of the layout pass.
应用程序应尽可能减少不必要的布局处理过程调用，从而改善性能。
The layout pass is a mathematically-intensive process—the larger the number of children in the collection, the greater the number of calculations required.
配置传递是数学密集的处理序，即集合中的子项数目愈多，需要的计算数就愈多。
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