react native实现监控手势上下拉动效果
react native实现监控手势进行上下拉动效果,详细核心代码如下:
代码:
import {PanResponder} from 'react-native'; var Dimensions = require('Dimensions'); const deviceHeight = Dimensions.get("window").height; const deviceWidth = Dimensions.get("window").width; class TaskfinishedPage extends Component { constructor(props) { super(props); console.disableYellowBox = true; this.state = { silderMargin: deviceHeight-230, }; this.lastY1 = this.state.silderMargin; } componentWillMount () { this._panResponder = PanResponder.create({ onStartShouldSetPanResponder: (evt, gestureState) => { return true; }, onMoveShouldSetPanResponder: (evt, gestureState) => { return true; }, onPanResponderGrant: (evt, gestureState) => { this._highlight(); }, onPanResponderMove: (evt, gestureState) => { console.log(`gestureState.dx : ${gestureState.dx} gestureState.dy : ${gestureState.dy}`); if(50<this.lastY1 + gestureState.dy&&this.lastY1 + gestureState.dy<deviceHeight-230){ this.setState({ // marginLeft1: this.lastX1 + gestureState.dx, silderMargin: this.lastY1 + gestureState.dy, }); } }, onPanResponderRelease: (evt, gestureState) => { this._unhighlight(); this.lastY1 = this.state.silderMargin; }, onPanResponderTerminate: (evt, gestureState) => { }, }); } //这两个方法手触摸以及离开时触发; _unhighlight(){ this.setState({ sliderBackgroundcolor: 'transparent', }); } _highlight(){ this.setState({ sliderBackgroundcolor: 'transparent', }); } render() { return ( <Container}> <Header> <Left> <Button transparent onPress={() => { NavigationUtil.resetGoBack(this.props.navigation); }}> <Icon name='arrow-back' style={{color:'#000'}}/> </Button> </Left> <Body > <Text style={{color:'#000'}}>Finshed任务详情</Text> </Body> <Right /> </Header> <View style={{ flex: 1 }}> <View style={ [styles.panelView, { backgroundColor: this.state.sliderBackgroundcolor, marginTop: this.state.silderMargin, zIndex:100 } ]} {...this._panResponder.panHandlers} > </View> </View> </Container> ); } const styles = { panelView: { width: deviceWidth-20, height: 410, marginLeft:10, marginRight:10, borderRadius:6, } } export default TaskfinishedPage;
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