Function MACaptionAppearanceIsCustomized 

pub unsafe extern "C-unwind" fn MACaptionAppearanceIsCustomized(
    domain: MACaptionAppearanceDomain,
) -> bool

Available on crate feature MACaptionAppearance only.

Provides a boolean indicating if the currently-active style has been customized by the user. This is useful for some clients who may need different fallback strategies for customized styles vs system-default styles.

Parameter domain: Preference domain, see

 MACaptionAppearanceDomain

.

Returns: A boolean indicating if the currently-active style has been customized by the user