View controllers can also display modal views, respond to low-memory warnings, and rotate views when the orientation changes.

视图控制器也可以显示独占的视图、回应低内存警告，以及当方向改变时旋转视图。

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How do Modal and Child View Controllers interact?

如何与孩子互动模型视图控制器？

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How do Modal and Child View Controllers interact?

如何与孩子互动模型视图控制器？

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