The target view for transition animations when presenting or dismissing the transition controller's document.
Mac Catalyst 13.0+
When this property is set, the transition controller acts as a UIViewControllerAnimatedTransitioning object for the transition from the browser to the document view controller. It provides transition animation that zooms and cross fades from the document's thumbnail to the target view.
To use the transition animation:
Instantiate the view controller to display the document.
Call the document view controller's loadViewIfNeeded() method to ensure that the view hierarchy is loaded.
Request a transition controller for the document you are going to present.
Assign a view from the document view controller to the transition controller's targetView property.
Create a UIViewControllerTransitioningDelegate object that returns the transition controller. You must keep a strong reference to both the transition controller and the transitioning delegate throughout the entire animation.