框架的底部导航栏包含一些不固定的链接，它们依赖于当前视图。

The bottom navigation bar of the frame contains some links that are not fixed; they depend on the current view.

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事实上，一般来讲，你应该避免给视图分配固定尺寸。

In fact, as a general rule, you should avoid assigning constant sizes to views.

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在垂直滚动布局中，内容视图的宽是固定的，高根据内容视图来调整以容纳内容视图。

In a vertically scrolling flow layout, the width of the content area remains fixed and the height grows to accommodate the content.

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