preferredFrameRateRange
A range of frequencies your app allows for frame updates, affecting how often the system invokes your delegate’s callback.
Declaration
var preferredFrameRateRange: CAFrameRateRange { get set }Mentioned in
Discussion
The display link makes a best attempt to invoke your app’s callback within the frequency range you set to this property. However, the system also takes into account the device’s hardware capabilities and the other tasks your game or app is running.
The system can change the available range of frame rates because it factors in system policies and a person’s preferences. For example, Low Power Mode, critical thermal state, and accessibility settings can affect the system’s frame rate.
The system typically provides a consistent frame rate by choosing one that’s a factor of the display’s maximum refresh rate. For example, a display link could invoke your callback 60 times per second for a display with a refresh rate of 60 hertz. However, the display link could invoke your callback less frequently, such as 30, 20, or 15 hertz, by setting a range with smaller values.
For more information, see Optimizing iPhone and iPad apps to support ProMotion displays.