react-native-swiper next/previous button event

Question

The swiper index value comes out in order of page order. However, when the button is pressed, the index value goes up to infinity.

ex) next button click-> 6/5, 7/5, 8/5

What I would like to do is stop the button event on 5/5 but I do not know what to do.

https://github.com/leecade/react-native-swiper

App.js

const renderPagination = (index, total, context) => {

  return (
    <View style={styles.paginationStyle}>
      <Text style={{ color: 'grey' }}>
        <Text style={styles.paginationText}>{index + 1}</Text>/{total}
      </Text>
    </View>
  )
}

export default class App extends Component {

  constructor(props){
    super(props);
    this.onPressNext = this.onPressNext.bind(this);
    this.state = {
      idxActive: 1
    }
 }

  onPressPrev = () => {
    this.refs.swiper.scrollBy(-1)
  }

  onPressNext = () => {
    this.refs.swiper.scrollBy(1);
  }

  render() {
    return (

      <View style={styles.container}>


        <Swiper
          style={styles.wrapper}
          renderPagination={renderPagination}
          showsButtons={false}
          loop={false}
          ref={'swiper'}
        >
          <View style={styles.slide}>
            <Text style={styles.text}>1 page</Text>
          </View>
          <View style={styles.slide}>
            <Text style={styles.text}>2 page</Text>
          </View>
          <View style={styles.slide}>
            <Text style={styles.text}>3 page</Text>
          </View>
          <View style={styles.slide}>
            <Text style={styles.text}>4 page</Text>
          </View>
          <View style={styles.slide}>
            <Text style={styles.text}>5 page</Text>
          </View>
        </Swiper>

        <View style={styles.buttoncontainer}>
          <Button
            onPress={this.onPressPrev}
            title="previous">
          </Button>
          <Button
            onPress={this.onPressNext}
            title="next">
          </Button>

        </View>
      </View>
    );
  }
}

Answer 1

Use the onIndexedChanged prop of the swiper to get the latest index and save it in your local component state. Something like:

export default class App extends Component {

  constructor(props){
    super(props);
    this.onPressNext = this.onPressNext.bind(this);
    this.onPressPrev = this.onPressPrev.bind(this);
    this.state = {
      idxActive: 0
    }
 }

  onPressPrev = () => {
    const {idxActive} = this.state;
    if (idxActive > 0) {
      this.refs.swiper.scrollBy(-1)
    }
  }

  onPressNext = () => {
    const {idxActive} = this.state;
    // Probably best set as a constant somewhere vs a hardcoded 5
    if (idxActive < 5) {
      this.refs.swiper.scrollBy(1);
    }
  }

  render() {
    return (

      <View style={styles.container}>


        <Swiper
          ... etc.
          onIndexChanged={idxActive => this.setState({idxActive})}
        >
          ... etc.