Is there a way to check if "increase contrast" is enabled in the accessibility settings in iOS?

As of iOS 8 there is a way to check:

UIKIT_EXTERN BOOL UIAccessibilityDarkerSystemColorsEnabled() NS_AVAILABLE_IOS(8_0);

as of modern iOS:

UIAccessibility.isDarkerSystemColorsEnabled

Apparently there's no public API for checking whether that option is on.

According to the UIKit Function Reference, the only checks you can perform are the following

• UIAccessibilityPostNotification
• UIAccessibilityIsVoiceOverRunning
• UIAccessibilityIsClosedCaptioningEnabled
• UIAccessibilityRequestGuidedAccessSession
• UIAccessibilityIsGuidedAccessEnabled
• UIAccessibilityIsInvertColorsEnabled
• UIAccessibilityIsMonoAudioEnabled
• UIAccessibilityZoomFocusChanged
• UIAccessibilityRegisterGestureConflictWithZoom
• UIAccessibilityConvertFrameToScreenCoordinates
• UIAccessibilityConvertPathToScreenCoordinates