How to access iPhone's general accessibility settings

I need to access the iPhone's general accessibility settings; I need to know whether the user has turn on features such as "Speak Auto-text" or "White on Black" and respond to that programatically. I don't need to change the values, only read them. Also, if there's a way of defining (for my app) to ignore them (and set the corresponding support programatically) - that would be a good solution.

An开发者_如何转开发y suggestions?

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what about UIKit accessibility methods?

Accessibility
UIAccessibilityPostNotification
UIAccessibilityIsVoiceOverRunning
UIAccessibilityIsClosedCaptioningEnabled
UIAccessibilityIsGuidedAccessEnabled
UIAccessibilityIsInvertColorsEnabled
UIAccessibilityIsMonoAudioEnabled
UIAccessibilityZoomFocusChanged
UIAccessibilityRegisterGestureConflictWithZoom

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You can't. I suspect this is by design.