struct · iOS 17.0+ · SDK 27.1
struct UnitCurveA function defined by a two-dimensional curve that maps an input progress in the range [0,1] to an output progress that is also in the range [0,1]. By changing the shape of the curve, the effective speed of an animation or other interpolation can be changed. The horizontal (x) axis defines the input progress: a single input progress value in the range [0,1] must be provided when evaluating a curve. The vertical (y) axis maps to the output progress: when a curve is evaluated, the y component of the point that intersects the input progress is returned.
static get easeInEaseOut(): UnitCurvestatic let easeInEaseOut: UnitCurveA bezier curve that starts out slowly, speeds up over the middle, then slows down again as it approaches the end. The start and end control points are located at (x: 0.42, y: 0) and (x: 0.58, y: 1).
static get circularEaseIn(): UnitCurvestatic let circularEaseIn: UnitCurveA curve that starts out slowly, then speeds up as it finishes. The shape of the curve is equal to the fourth (bottom right) quadrant of a unit circle.
static get circularEaseOut(): UnitCurvestatic let circularEaseOut: UnitCurveA circular curve that starts out quickly, then slows down as it approaches the end. The shape of the curve is equal to the second (top left) quadrant of a unit circle.
static get circularEaseInOut(): UnitCurvestatic let circularEaseInOut: UnitCurveA circular curve that starts out slowly, speeds up over the middle, then slows down again as it approaches the end. The shape of the curve is defined by a piecewise combination of `circularEaseIn` and `circularEaseOut`.
value(progress: number): numberfunc value(at progress: Double) -> DoubleReturns the output value (y component) of the curve at the given time. - Parameters: - progress: The input progress (x component). The provided value is clamped to the range [0,1]. - Returns: The output value (y component) of the curve at the given progress.
static bezier(startControlPoint: UnitPoint, endControlPoint: UnitPoint): UnitCurvestatic func bezier(startControlPoint: UnitPoint, endControlPoint: UnitPoint) -> UnitCurveCreates a new curve using bezier control points. The x components of the control points are clamped to the range [0,1] when the curve is evaluated. - Parameters: - startControlPoint: The cubic Bézier control point associated with the curve's start point at (0, 0). The tangent vector from the start point to its control point defines the initial velocity of the timing function. - endControlPoint: The cubic Bézier control point associated with the curve's end point at (1, 1). The tangent vector from the end point to its control point defines the final velocity of the timing function.
static get easeIn(): UnitCurvestatic let easeIn: UnitCurveA bezier curve that starts out slowly, then speeds up as it finishes. The start and end control points are located at (x: 0.42, y: 0) and (x: 1, y: 1).
static get linear(): UnitCurvestatic let linear: UnitCurveA linear curve. As the linear curve is a straight line from (0, 0) to (1, 1), the output progress is always equal to the input progress, and the velocity is always equal to 1.0.
static get easeOut(): UnitCurvestatic let easeOut: UnitCurveA bezier curve that starts out quickly, then slows down as it approaches the end. The start and end control points are located at (x: 0, y: 0) and (x: 0.58, y: 1).
get inverse(): UnitCurvevar inverse: UnitCurve { get }Returns a copy of the curve with its x and y components swapped. The inverse can be used to solve a curve in reverse: given a known output (y) value, the corresponding input (x) value can be found by using `inverse`: let curve = UnitCurve.easeInOut /// The input time for which an easeInOut curve returns 0.6. let inputTime = curve.inverse.evaluate(at: 0.6)
velocity(progress: number): numberfunc velocity(at progress: Double) -> DoubleReturns the rate of change (first derivative) of the output value of the curve at the given time. - Parameters: - progress: The input progress (x component). The provided value is clamped to the range [0,1]. - Returns: The velocity of the output value (y component) of the curve at the given time.
static get easeInOut(): UnitCurvestatic let easeInOut: UnitCurveA bezier curve that starts out slowly, speeds up over the middle, then slows down again as it approaches the end. The start and end control points are located at (x: 0.42, y: 0) and (x: 0.58, y: 1).
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