The timing information for animations in the form of a cubic Bézier curve.
- iOS 10.0+
- Mac Catalyst 13.0+
- tvOS 10.0+
A cubic Bézier timing curve consists of a line whose starting point is (0, 0), whose end point is (1, 1), and whose shape is defined by two control points. The slope of the line at each point in time defines the speed of the animation at that time. Steep slopes cause animations to appear to run faster and shallower slopes cause them to appear to run slower. Figure 1 shows a timing curve where the animations start fast and finish fast but run more slowly through the middle section.