When using Auto Layout, the goal is to provide a series of equations that have one and only one possible solution.

当你使用自动布局时，目标是提供一系列的方程式，而这些方程式有且只有一种解决方法。

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Auto layout is designed to create layouts that dynamically adapt to their environment.

自动布局是用来动态改变布局的尺寸以适应它们的环境。

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Auto Layout then calculates the size and location of each view based on these constraints.

自动布局然后根据这些约束来计算每个视图的尺寸和位置。

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Previously, auto layout was interpreting the bottom of a UILabel to be the same as its baseline.

ENGADGET: Apple seeds iOS 6 beta 4 to developers: here's the changelog

In general, auto layout considers the top, left, bottom, and right edges of a view to be the visible edges.

ENGADGET: Apple seeds iOS 6 beta 4 to developers: here's the changelog

To make this work with auto layout, the meaning of the top, left, bottom, and right edges within a scroll view now mean the edges of its content view.

ENGADGET: Apple seeds iOS 6 beta 4 to developers: here's the changelog