react-native-scrolltotop

a RN component make list come back to top.

$3

!scrolltotop ios preview
－－－
!scrolltotop android preview

$3

``
npm install --save react-native-scrolltotop
`

$3

see the example/example.js for a more detailed example.
`javascript
import ScrollTopView from 'react-native-scrolltotop';

//first set default state in your constructor
constructor(props) {
//...
this.state = {
isShowToTop: false,
refData:['listview'],
};
}

//then bind a method to detect the scroll distance of your listView
//set ref with 'listview'
ref="listview"
onScroll={(e)=>this._onScroll(e)}
style={styles.listView}
renderScrollComponent={(props)=>{
return
}}/>

//here is the _onScrol method
_onScroll(e) {
var offsetY = e.nativeEvent.contentOffset.y;

if(offsetY > 100) {
this.setState({
isShowToTop: true
})
} else {
this.setState({
isShowToTop: false
})
}
}

//use it with your listView together


消息列表

{listView}
{this.state.isShowToTop?:null}

``

$3

Prop | Type | Optional | Default | Description
--------------- | ------ | -------- | --------- | -----------
root | | require | | current component
width | number | Yes | 60 | use in both the button and the image if you have
height | number | Yes | 60 | use in both the button and the image if you have
bgColor | string | Yes | '#099fde' | backgroundColor of button，
isRadius | bool | Yes | true | whether need a borderRadius of your button
bdRadius | number | Yes | 30 | borderRadius of your button
left | number | Yes | Dimensions.get('window').width - 80 | distance from the left
top | number | Yes | Dimensions.get('window'.height - 160 | distance from the top
#### use Text
Prop | Type | Optional | Default | Description
--------------- | ------ | -------- | --------- | -----------
color | string | Yes | '#ffffff' | color of your text
fontSize | number | Yes | 12 | fontSize of your text
#### use Image
Prop | Type | Optional | Default | Description
--------------- | ------ | -------- | --------- | -----------
width | number | Yes | 60 | same with button
height | number | Yes | 60 | same with button
imageUri | string | Yes | a base64 img | uri of your Image

if it is useful to you, let me know :smile:.