extendedLayoutIncludesOpaqueBars

This value is just an addition to the previous ones. If the status bar is opaque, the views won't be extended to include the status bar too, unless this parameter is YES.

So, if you extend your view to cover the navigation bar (edgesForExtendedLayout to UIRectEdgeAll) and the parameter is NO (default) it wont cover the status bar if it's opaque.

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