Display value of slider with respect to slider thu

问题:

I want to move the label with respect to slider thumb just like this one:

Right now my slider is like this:

I want to display the label shown as 30 km with respect to the slider thumb such that as the slider moves, the label should move accordingly.

I am using Native React Slider component.

this is my code:

<Slider 
     style={styles.slider} 
     thumbTintColor='rgb(252, 228, 149)' 
     step={1} 
     maximumValue={5} 
     thumbTintColor='rgb(252, 228, 149)' 
     maximumTrackTintColor='#494A48' 
     minimumTrackTintColor='rgb(252, 228, 149)' />

回答1:

Solution to your problem:

    constructor(props){
        super(props)
        this.state = {
            distance: 30,
            minDistance: 10,
            maxDistance: 100
        }
    }


    render() {
        return (
            <View style={styles.container}>
                <Slider
                    style={{ width: 300}}
                    step={1}
                    minimumValue={this.state.minDistance}
                    maximumValue={this.state.maxDistance}
                    value={this.state.distance}
                    onValueChange={val => this.setState({ distance: val })}
                    thumbTintColor='rgb(252, 228, 149)'
                    maximumTrackTintColor='#d3d3d3' 
                    minimumTrackTintColor='rgb(252, 228, 149)'
                />
                <View style={styles.textCon}>
                    <Text style={styles.colorGrey}>{this.state.minDistance} km</Text>
                    <Text style={styles.colorYellow}>
                        {this.state.distance + 'km'}
                    </Text>
                    <Text style={styles.colorGrey}>{this.state.maxDistance} km</Text>
                </View>
            </View>
        );
    }
}

Styles:

const styles = StyleSheet.create({
    container: {
        flex: 1,
        justifyContent: 'center',
        alignItems: 'center',
        backgroundColor: '#000',
    },
    textCon: {
        width: 320,
        flexDirection: 'row',
        justifyContent: 'space-between'
    },
    colorGrey: {
        color: '#d3d3d3'
    },
    colorYellow: {
        color: 'rgb(252, 228, 149)'
    }
});

Output:

Working Snippet: https://snack.expo.io/Syrt3Bs7z

回答2:

You can adjust left of the text to the value of the slider.

const left = this.state.value * (screenWidth-60)/100 - 15;

<Text style={ { width: 50, textAlign: 'center', left: left } }>
  {Math.floor( this.state.value )}
</Text>

<Slider maximumValue={100} 
        value={this.state.value}
        onValueChange={value => this.setState({ value })} />

回答3:

Built in <Slider /> doesn't provide those flexibility to customize what you want.

This should works, react-native-slider, which is a drop-in replacement of official <Slider />.

What you need is very similar to it's demo style #4.

For your Slider Label of value, you can modify its function _renderThumbImage() to replace default <Image />.

回答4:

1. measure the size and position of the slider View

   <Slider
       maximumValue={10}
       onLayout={(event)=>{this.slider_bound(event)}}/>
   
   
   //majore size of Slider.
   slider_bound=(event)=>{
   var {x, y, width, height} = event.nativeEvent.layout;
   this.state.slider_Width=width;
   this.state.slider_Height=height;
   this.state.slider_x = x;
   this.state.slider_y = y;
   this.state.slider_x_step_size = width/10; //Devide the width by slider maximum value
   
   this.setState({triger:''});
   console.log(TAG+"Slider Dimen:"+width,height+'pos:',x,y);
   
   }
   

2.Now in "onValueChange" callback of slider.

   //compute position to show slider value txt
   this.state.value_x = (value * this.state.slider_x_step_size) + this.state.slider_x;
   this.state.value_y = this.state.slider_Height + this.state.slider_y; 

3. Show the slider Value txt on Calculated positions.

   <Text style={{position:'absolute',top:this.state.value_y,left:this.state.value_x,color:colors.blackc}}>{this.state.data.slider_value}</Text>
   

.............. that will do the job, but You might have to tweak it little bit.

回答5:

I think react-native-multi-slider will solve your problem . You can change the slider thumb by sending your custom designed component to the customMarker prop that is available. Then you can wrap the Multislider in another component, maintain the state(for slider position value) there and send value as prop to your custom designed marker everytime the thumb position changes which can be detected using onValuesChange prop.

This link might also help you.