React Native: How to swipe something off screen with bounce? - animation

Question

I'm trying to make something where you can swipe the overlay off the screen.
This is what I have so far using PanResponder, but I don't feel like it's very clean. It's my first time using it so I'm wondering if there's a better way of doing this.
I need to animate the green part and more so I'd like to build this by hand if possible without using a package.
My component looks like this (heavily copied off this guy:
https://github.com/brentvatne/react-native-animated-demo-tinder/blob/master/index.ios.js)
import React, { Component } from 'react';
import {
AppRegistry,
StyleSheet,
View,
PanResponder,
Animated,
Dimensions,
} from 'react-native';
const styles = StyleSheet.create({
container: {
flex: 1,
alignSelf: 'stretch',
backgroundColor: '#000000',
},
overlay: {
flex: 1,
alignSelf: 'stretch',
backgroundColor: '#0000ff',
},
video: {
position: 'absolute',
backgroundColor: '#00ff00',
top: 0,
left: 0,
bottom: 0,
right: 0,
}
});
function clamp(value, min, max) {
return min < max
? (value < min ? min : value > max ? max : value)
: (value < max ? max : value > min ? min : value)
}
export default class EdmundApp 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: 0});
this.state.pan.setValue({x: 0, y: 0});
},
onPanResponderMove: Animated.event([
null, {dx: this.state.pan.x, dy: 0},
]),
onPanResponderRelease: (e, {vx, vy}) => {
this.state.pan.flattenOffset();
if (vx >= 0) {
velocity = clamp(vx, 3, 5);
} else if (vx < 0) {
velocity = clamp(vx * -1, 3, 5) * -1;
}
if (Math.abs(this.state.pan.x._value) > 150) {
Animated.decay(this.state.pan, {
velocity: {x: velocity, y: vy},
deceleration: 0.98
}).start()
} else {
Animated.spring(this.state.pan, {
toValue: {x: 0, y: 0},
friction: 4
}).start()
}
}
});
}
render() {
let { pan } = this.state;
let translateX = pan.x;
let swipeStyles = {transform: [{translateX}]};
return (
<View style={styles.container}>
<View style={styles.video}></View>
<Animated.View style={[styles.overlay, swipeStyles]} {...this._panResponder.panHandlers}>
</Animated.View>
</View>
);
}
}
AppRegistry.registerComponent('EdmundApp', () => EdmundApp);

Answer 1

Please go through this https://github.com/oblador/react-native-animatable
There is an option for bounce and exit which will help you for sure.