如何在React Native中从底部将<View />滑入和滑出？

Jo Ko 发表于 Dev

乔高

在React Native iOS中，我想像下图中那样滑入和滑出。

在下面的示例中，当按下一个按钮时，Payment Information视图从底部弹出，而当按下折叠按钮时，该视图回落并消失。

这样做的正确和正确方法是什么？

先感谢您！

编辑

艾哈迈德·哈达德（Ahmad Al Haddad）

基本上，您需要将视图绝对定位在屏幕底部。然后，将其y值转换为等于其高度。（子视图必须具有特定的高度才能知道要移动多少）

这是显示结果的游乐场：https : //rnplay.org/apps/n9Gxfg

代码：

'use strict';

import React, {Component} from 'react';
import ReactNative from 'react-native';

const {
  AppRegistry,
  StyleSheet,
  Text,
  View,
  TouchableHighlight,
  Animated
} = ReactNative;


var isHidden = true;

class AppContainer extends Component {
  constructor(props) {
    super(props);
    this.state = {
      bounceValue: new Animated.Value(100),  //This is the initial position of the subview
      buttonText: "Show Subview"
    };
  }


  _toggleSubview() {    
    this.setState({
      buttonText: !isHidden ? "Show Subview" : "Hide Subview"
    });

    var toValue = 100;

    if(isHidden) {
      toValue = 0;
    }

    //This will animate the transalteY of the subview between 0 & 100 depending on its current state
    //100 comes from the style below, which is the height of the subview.
    Animated.spring(
      this.state.bounceValue,
      {
        toValue: toValue,
        velocity: 3,
        tension: 2,
        friction: 8,
      }
    ).start();

    isHidden = !isHidden;
  }

  render() {
    return (
      <View style={styles.container}>
          <TouchableHighlight style={styles.button} onPress={()=> {this._toggleSubview()}}>
            <Text style={styles.buttonText}>{this.state.buttonText}</Text>
          </TouchableHighlight>
          <Animated.View
            style={[styles.subView,
              {transform: [{translateY: this.state.bounceValue}]}]}
          >
            <Text>This is a sub view</Text>
          </Animated.View>
      </View>
    );
  }
}

var styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
    marginTop: 66
  },
  button: {
    padding: 8,
  },
  buttonText: {
    fontSize: 17,
    color: "#007AFF"
  },
  subView: {
    position: "absolute",
    bottom: 0,
    left: 0,
    right: 0,
    backgroundColor: "#FFFFFF",
    height: 100,
  }
});

AppRegistry.registerComponent('AppContainer', () => AppContainer);