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React: Cross-Platform Application Development with React Native

You're reading from   React: Cross-Platform Application Development with React Native Build 4 real-world apps with React Native

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Product type Paperback
Published in Mar 2018
Publisher Packt
ISBN-13 9781789136081
Length 182 pages
Edition 1st Edition
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Author (1):
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Emilio Rodriguez Martinez Emilio Rodriguez Martinez
Author Profile Icon Emilio Rodriguez Martinez
Emilio Rodriguez Martinez
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Toc

Parrot


The main character will be represented by this component, which will comprise of two different images (the same parrot with its wings up and down) driven by the Y position property passed by <GameContainer />:

/*** src/components/parrot.js ***/

import React from “react";
import { Image } from “react-native";
import { W, H } from “../constants";

export default class Parrot extends React.Component {
  constructor() {
    super();
    this.state = { wings: “down" };
  }

  componentWillUpdate(nextProps, nextState) {
    if (this.props.y < nextProps.y) {
      this.setState({ wings: “up" });
    } else if (this.props.y > nextProps.y) {
      this.setState({ wings: “down" });
    }
  }

  render() {
    let parrotImage;
    if (this.state.wings === “up") {
      parrotImage = require(“../../images/parrot1.png");
    } else {
      parrotImage = require(“../../images/parrot2.png");
    }
    return (
      <Image
        source={parrotImage}
        style={{
          position...
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