PTToolManagerAnnotationWillRemoveNotification
extern const NSNotificationName _Nonnull PTToolManagerAnnotationWillRemoveNotification
Posted when an annotation will be removed.
The notification object is the tool manager that posted the notification. The userInfo dictionary
contains entries for the PTToolManagerAnnotationUserInfoKey and PTToolManagerPageNumberUserInfoKey
keys.
PTToolManagerAnnotationWillRemoveNotification Constant Reference