Asks your delegate for the transition animator object to use when presenting a view controller.
- iOS 7.0+
- tvOS 9.0+
The view controller object that is about to be presented onscreen.
The view controller that is presenting the view controller in the
presentedparameter. The object in this parameter could be the root view controller of the window, a parent view controller that is marked as defining the current context, or the last view controller that was presented. This view controller may or may not be the same as the one in the
The view controller whose
present(_:method was called.
The animator object to use when presenting the view controller or
nil if you do not want to present the view controller using a custom transition. The object you return should be capable of performing a fixed-length animation that is not interactive.
Use this method to create and return an object that implements the methods of the
UIView protocol. Your implementation of that protocol must animate the appearance of the
presented view controller’s view onscreen. Use the
source parameters to initialize your animator object or perform any tasks necessary to prepare the transition animations. You may return
nil from this method if you do not want to implement a custom transition animation for the specified set of view controllers.
For information on implementing your transition animator object, see