Question

您好，我正在用React Native制作游戏，但由于无法让两个玩家同时在同一部手机上水平拖放元素而陷入困境。

我有两个类似的内容：

export class Player1 extends Component{
    constructor(props){
        super(props);

        this.state = {  
            pan             : new Animated.ValueXY()
        };
    }
    componentWillMount(){
        this.panResponder = PanResponder.create({    
            onMoveShouldSetResponderCapture : () => true,
            onMoveShouldSetPanResponderCapture : () => true,

            onPanResponderGrant : (e, gestureState) => {
                this.state.pan.setOffset({x: this.state.pan.x._value, y: this.state.pan.y._value});
                this.state.pan.setValue({x: 0, y: 0});
            },

            onPanResponderMove : Animated.event([null,{ 
                dx : this.state.pan.x,
            }]),
            onPanResponderRelease: (e, {vx, vy}) => {
            }
        });
    }


    render(){
        return (
                <View style={styles.mainContainer}>
                    {this.renderDraggable()}
                </View>
        );
    }

    renderDraggable(){
        return (
                <View style={styles.draggableContainer}>
                    <Animated.View                  
                    style={[this.state.pan.getLayout(), styles.triangle]}
                    {...this.panResponder.panHandlers}   > 
                    </Animated.View>
            </View>

        );
}
}

在我的屏幕上，我这样称呼我的组件：

export default function HomeScreen() {
  return (
    <View>
     <Player1></Player1>
     <Player2></Player2>
    </View>
  );
}

感谢您的帮助

Answer 1

我找到了一个解决方案，例如在示例https://kmagiera.github.io/react-native-gesture-handler/docs/example.html

的doubleDraggable目录中使用了react-native-gesture-handle

我的代码：

和屏幕：

import React, { Component } from 'react';
import { Animated, StyleSheet, View } from 'react-native';

import {
  PanGestureHandler,
  ScrollView,
  State,
} from 'react-native-gesture-handler';


export class Players extends Component {
  constructor(props) {
    super(props);
    this._translateX = new Animated.Value(0);
    this._translateY = new Animated.Value(0);
    this._lastOffset = { x: 0, y: 0 };
    this._onGestureEvent = Animated.event(
      [
        {
          nativeEvent: {
            translationX: this._translateX,

          },
        },
      ],

    );
  }
  _onHandlerStateChange = event => {
    if (event.nativeEvent.oldState === State.ACTIVE) {
      this._lastOffset.x += event.nativeEvent.translationX;
      this._translateX.setOffset(this._lastOffset.x);
      this._translateX.setValue(0);
      this._translateY.setOffset(this._lastOffset.y);
      this._translateY.setValue(0);
    }
  };
  render() {
    return (
      <PanGestureHandler
        {...this.props}
        onGestureEvent={this._onGestureEvent}
        onHandlerStateChange={this._onHandlerStateChange}>
        <Animated.View
          style={[
            styles.box,
            {
              transform: [
                { translateX: this._translateX },
                { translateY: this._translateY },
              ],
            },
            this.props.boxStyle,
          ]}
        />
      </PanGestureHandler>
    );
  }
}

export default class Example extends Component {
  render() {
    return (
      <View style={styles.scrollView}>
        <DraggableBox />
      </View>
    );
  }
}

const styles = StyleSheet.create({
  scrollView: {
    flex: 1,
  },
  box: {
    position: 'absolute',
    width: 0,
    height: 0,
    backgroundColor: 'transparent',
    borderStyle: 'solid',
    borderLeftWidth: 25,
    borderRightWidth: 25,
    borderBottomWidth: 50,
    borderLeftColor: 'transparent',
    borderRightColor: 'transparent',
  },
});

在React Native中同时进行多个拖放

1 个答案: