A Boolean value that determines whether the view always renders at its preferred frame rate or only when its visible content changes.
- iOS 11.0+
- macOS 10.13+
- tvOS 11.0+
When this value is
false (the default), the view redraws its contents only when something in its scene graph change or animates. Use this option to maximize energy efficiency.
If you change this value to
true, the view redraws itself continually, at the rate specified by the
preferred property, regardless of whether content is changing or animating.