frameInterval
The number of frames that must pass before the display link notifies the target again.
Declaration
var frameInterval: Int { get set }Discussion
The default value is 1, which results in the system notifying your app at the refresh rate of the display. If you set the value to a value greater than 1, the display link notifies your app at a fraction of the native refresh rate. For example, setting the interval to 2 causes the display link to fire every other frame, providing half the frame rate.
Setting this value to less than 1 results in undefined behavior and is a programmer error.