Returns the completion curve associated with the transition.
- iOS 10.0+
- Mac Catalyst 13.0+
- tvOS 10.0+
The completion curve for the view controller transition. For a list of possible values, see the
The completion curve defines the timing of the animations. For interactive transitions, this value is usually obtained from the
completion property of the interactive animator object. Use this value when configuring your own animations if you want the same timing as the main transition.