@bankify/react-native-animate-number
v0.2.1
Published
Animated number component
Downloads
834
Readme
react-native-animate-number
Customizable react native component for number animations.
Installation
$ yarn add @bankify/react-native-animate-number
Usage
import AnimateNumber from '@bankify/react-native-animate-number'
Examples
Basic
The only required property is value
, when this property changes, it automatically interpolates
value and performs animation.
<AnimateNumber value={100}/>
Formatting
You can customize text format by specifying formatter
prop, this property must be a function
.
<AnimateNumber value={100} formatter={(val) => {
return '$ ' + parseFloat(val).toFixed(2)
}}/>
Timing function
There're 3 built-in timing functions which are linear
, easeIn
, and easeOut
.
It is also possible customize your timing function, see examples bellow.
Built-in timing function
<AnimateNumber value={100} timing="linear"/>
<AnimateNumber value={100} timing="easeOut"/>
<AnimateNumber value={100} timing="easeIn"/>
Customized timing function
Customized timing function returns a number
which represents the length of animation frame.
interval
Basic interval length of animation frame, default value is 14
ms. You can change this value by interval
prop.
progress
A float number between 0 to 1, which means the progress of animation.
<AnimateNumber value={200}
countBy={1}
timing={(interval, progress) => {
// slow start, slow end
return interval * (1 - Math.sin(Math.PI*progress) )*10
}}/>
the above example will make an animation like this
Counting
By default this component calculates value increment of each animation frame,
but you can customize this rule by set prop countBy
.
<AnimateNumber value={100} countBy={1} />
But keep in mind if the countBy
value is relative small than value
, the animation may persists for a very long time.
Like the following example, it will tasks 150 seconds to finish the animation.
<AnimateNumber value={10000} interval={15} countBy={1} />
Customize content rendering
By default this component renders a <Text>
component. You can provide your
own component by setting the prop renderContent
.
<AnimateNumber value={100} countBy={1} renderContent={(displayValue) => #Your own component} />
Props
value:number
(required)
The value of AnimateNumber component.
countBy:number
(optional default to null
)
Set this property to force the component's value increase/decrease by this number.
interval:number
(optional default to 14
)
Base interval of each animation frame, in ms
.
steps:number
(optional default to 45
)
Set total frame number of animation, say, if interval is 14 and steps is 30, the animation will take 14x30ms to finish when it uses linear timing function.
timing: 'linear' | 'easeOut' | 'easeIn' | () => number
Custom timing function or use a default timing function.
formatter: () => string
(optional)
This prop accepts a function
which returns a string
as displayed value.
renderContent: (displayValue: number) => React.Node
(optional)
This prop accepts a function
with the displaying value as the parameter and
expects a React Node as returned value
onProgress: () => void
(optional)
A function that triggers when text state has updated.
onFinish: () => void
(optional)
A function that triggers when animation completes.