画面の向き判定

swift

@Environment(\.horizontalSizeClass) var horizontalSizeClass
horizontalSizeClass == .compact // タテ画面

こんな感じらしい

txt

                  horizontal   vertical
ヨコ (Landscape)   compact      compact
ヨコ (Landscape)   regular      compact
タテ (Portrait)    compact      regular
？？？             regular      regular