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。
View controllers can also display modal views, respond to low-memory warnings, and rotate views when the orientation changes.
例如，它可以用你的照片替换巴士站棚侧面的海报，或者老式黑白电视的萤幕。它还有用来流览照片的3d旋转视图，以及通过旋转相机翻转图片的模式。
It also has a 3-d carousel view for browsing through your photos, and another mode where you can flip through pictures by tilting the camera.
在3D视图中，你可以随便倾斜，旋转和放大缩小。
You can now explore the map in 3D; tilting, rotating and zooming your way around.
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