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Version: 0.70

Easing

Easing模块实现了常见的动画缓动函数。 This module is used by Animated.timing() to convey physically believable motion in animations.

你可以在 http://easings.net/ 查看一些常见的缓动函数的视觉展示。

查看预置动画​

Easing模块通过以下几个方法提供了几种预置的动画：

  • back provides a simple animation where the object goes slightly back before moving forward
  • bounce provides a bouncing animation
  • ease provides a simple inertial animation
  • elastic provides a simple spring interaction

查看标准函数​

目前提供了三种标准缓动函数：

The poly function can be used to implement quartic, quintic, and other higher power functions.

查看补充函数​

此外还通过以下几个方法提供了几种数学函数：

  • bezier provides a cubic bezier curve
  • circle provides a circular function
  • sin provides a sinusoidal function
  • exp provides an exponential function

The following helpers are used to modify other easing functions.

  • in runs an easing function forwards
  • inOut makes any easing function symmetrical
  • out runs an easing function backwards

示例​

文档

方法​

step0()​

React JSX
static step0(n)

A stepping function, returns 1 for any positive value of n.

step1()​

React JSX
static step1(n)

A stepping function, returns 1 if n is greater than or equal to 1.

linear()​

React JSX
static linear(t)

A linear function, f(t) = t. Position correlates to elapsed time one to one.

http://cubic-bezier.com/#0,0,1,1

ease()​

React JSX
static ease(t)

A simple inertial interaction, similar to an object slowly accelerating to speed.

http://cubic-bezier.com/#.42,0,1,1

quad()​

React JSX
static quad(t)

A quadratic function, f(t) = t * t. Position equals the square of elapsed time.

http://easings.net/#easeInQuad

cubic()​

React JSX
static cubic(t)

A cubic function, f(t) = t * t * t. Position equals the cube of elapsed time.

http://easings.net/#easeInCubic

poly()​

React JSX
static poly(n)

A power function. Position is equal to the Nth power of elapsed time.

n = 4: http://easings.net/#easeInQuart n = 5: http://easings.net/#easeInQuint

sin()​

React JSX
static sin(t)

A sinusoidal function.

http://easings.net/#easeInSine

circle()​

React JSX
static circle(t)

A circular function.

http://easings.net/#easeInCirc

exp()​

React JSX
static exp(t)

An exponential function.

http://easings.net/#easeInExpo

elastic()​

React JSX
static elastic(bounciness)

A simple elastic interaction, similar to a spring oscillating back and forth.

Default bounciness is 1, which overshoots a little bit once. 0 bounciness doesn't overshoot at all, and bounciness of N > 1 will overshoot about N times.

http://easings.net/#easeInElastic

back()​

React JSX
static back(s)

Use with Animated.parallel() to create a simple effect where the object animates back slightly as the animation starts.

bounce()​

React JSX
static bounce(t)

Provides a simple bouncing effect.

http://easings.net/#easeInBounce

bezier()​

React JSX
static bezier(x1, y1, x2, y2)

Provides a cubic bezier curve, equivalent to CSS Transitions' transition-timing-function.

A useful tool to visualize cubic bezier curves can be found at http://cubic-bezier.com/

in()​

React JSX
static in(easing);

Runs an easing function forwards.

out()​

React JSX
static out(easing)

Runs an easing function backwards.

inOut()​

React JSX
static inOut(easing)

Makes any easing function symmetrical. The easing function will run forwards for half of the duration, then backwards for the rest of the duration.