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CADisplayLink | Apple Developer Documentation

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Your app initializes a new display link by providing a target object and a selector to call when the system updates the screen. To synchronize your display loop with the display, your application adds it to a run loop using the add(to:forMode:) method. Once you associate the display link with a run loop, the system calls the selector on the target when the screen’s contents need to update. The target can read the display link’s timestamp property to retrieve the time the system displayed the previous frame. For example, an app that displays movies might use timestamp to calculate which video frame to display next. An app that performs its own animations might use timestamp to determine where and how visible objects appear in the upcoming frame. The duration property provides the amount of time between frames at the maximumFramesPerSecond. To calculate the actual frame duration, use targetTimestamp - timestamp. You can use this value in your app to calculate the frame rate of the displa

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