Type Method

setAnimationTransition(_:for:cache:)

Sets a transition to apply to a view during an animation block.

Declaration

class func setAnimationTransition(_ transition: UIViewAnimationTransition, for view: UIView, cache: Bool)

Parameters

transition

A transition to apply to view. Possible values are described in UIViewAnimationTransition.

view

The view to apply the transition to.

cache

If true, the before and after images of view are rendered once and used to create the frames in the animation. Caching can improve performance but if you set this parameter to true, you must not update the view or its subviews during the transition. Updating the view and its subviews may interfere with the caching behaviors and cause the view contents to be rendered incorrectly (or in the wrong location) during the animation. You must wait until the transition ends to update the view.

If false, the view and its contents must be updated for each frame of the transition animation, which may noticeably affect the frame rate.

Discussion

If you want to change the appearance of a view during a transition—for example, flip from one view to another—then use a container view, an instance of UIView, as follows:

  1. Begin an animation block.

  2. Set the transition on the container view.

  3. Remove the subview from the container view.

  4. Add the new subview to the container view.

  5. Commit the animation block.

Use of this method is discouraged in iOS 4.0 and later. You should use the transition(with:duration:options:animations:completion:) method to perform transitions instead.