observationInfo()

Declaration

func observationInfo() -> UnsafeMutableRawPointer?

Return Value

The observation info of the receiver.

Discussion

For more about key-value observation, see Key-Value Observing Programming Guide.

See Also

Supporting Key-Value Observing

• didAccessValue(forKey:)
• setObservationInfo(_:)
• willAccessValue(forKey:)
• didChangeValue(forKey:)
• didChangeValue(forKey:withSetMutation:using:)
• willChangeValue(forKey:)
• willChangeValue(forKey:withSetMutation:using:)