UIKit Functions The UIKit framework defines a number of functions, many of them used in graphics and drawing operations. TopicsFunctionsUIDeviceOrientationIsLandscape(_:)UIDeviceOrientationIsPortrait(_:)UIDeviceOrientationIsValidInterfaceOrientation(_:)UIInterfaceOrientationIsLandscape(_:)UIInterfaceOrientationIsPortrait(_:)UIWritingToolsCoordinatorTextAnimationDebugDescription(_:) See AlsoReferenceUIKit EnumerationsUIKit ConstantsUIKit Data Types