How to slide in and out from the bottom in

问题:

In React Native iOS, I would like to slide in and out a like to following in the picture.

In the following example, when a button is pressed, the Payment Information view pops up from the bottom and when the collapse button is pressed, it goes back down and disappears.

What would be the correct and proper way to go about doing so?

Thank you in advance!

EDIT

回答1:

Basically, you need to absolute-position your view to the bottom of the screen. Then you translate its y value to equal its height. (The sub view must have a specific height in order to know how much to move it)

Here's a playground showing the result: https://rnplay.org/apps/n9Gxfg

Code:

'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);

回答2:

I know it is a little bit late, but thought it might be useful for someone. You should try out a component called rn-sliding-out-panel. It works awesomely. https://github.com/octopitus/rn-sliding-up-panel

<SlidingUpPanel
    draggableRange={top: 1000, bottom: 0}
    showBackdrop={true|false /*For making it modal-like*/}
    ref={c => this._panel = c}
    visible={ture|false /*If you want it to be visible on load*/}
></SlidingUpPanel>

And you can even open it from an external button:

<Button onPress={()=>{this._panel.transitionTo(1000)}} title='Expand'></Button>

You can install it via npm: sudo npm install rn-sliding-out-panel --save on your react-native root directory.

---

I hope it helps someone :D