preferredFramesPerSecond
The rate at which the view redraws its contents.
Declaration
var preferredFramesPerSecond: Int { get set }Discussion
When your application sets its preferred frame rate, the view chooses a frame rate as close to that as possible based on the capabilities of the screen the view is displayed on. To provide a consistent frame rate, the actual frame rate chosen is usually a factor of the maximum refresh rate of the screen. For example, if the maximum refresh rate of the screen is 60 frames per second, that’s also the highest frame rate the view sets as the actual frame rate. However, if you ask for a lower frame rate, the view might choose 30, 20, or 15 frames per second, or another factor, as the actual frame rate.
Your application should choose a frame rate that it can consistently maintain. The default value is 60 frames per second.