Swift UIInterfaceOrientationMaskの値
UIInterfaceOrientationMaskドキュメント
UIInterfaceOrientationMask.portrait :2 (00010) UIInterfaceOrientationMask.portraitUpsideDown:4 (00100) UIInterfaceOrientationMask.landscapeRight :8 (01000) UIInterfaceOrientationMask.landscapeLeft :16(10000) UIInterfaceOrientationMask.landscape :24(11000) UIInterfaceOrientationMask.allButUpsideDown :26(11010) UIInterfaceOrientationMask.all :30(11110)