iOS全屏设置

1.需要全屏

    在ios7.1以后，ios会根据navigationBar的translucent来自动确定是否全屏。

    self.extendedLayoutIncludesOpaqueBars = YES;

2.不要全屏

    self.edgesForExtendedLayout = UIRectEdgeNone;

    self.automaticallyAdjustsScrollViewInsets = YES;