React Native Gestures

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Build a cross-platform app with gestures and a persistent login experience

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React Native for Designers Part 2

React Native Gestures

28:46

Advanced Gestures

16:09

Looping the Cards

16:41

Animated Transition

16:36

Managing Gestures

22:29

Input and Keyboard

27:14

Lottie Animation Files

21:23

14:43

Firebase Authentification

10:51

Persistent Data

16:27

AsyncStorage with Redux

14:27

Publish to Android and iOS

16:22

Diving Deeper into React Native

The first part touched a lot on the UI, animations and light aspect of data, using libraries like Styled Components, Expo, Redux, Apollo and Contentful. As always, courses on Design+Code are all about the workflow and building your app from zero, from the perspective of a designer. The goal is to get you familiar with the platform and the tools, and allow you to collaborate better with engineers.

1.1

First, we'll create some gesture interactions within the app and transition nicely to a full card. Since animated assets can save so much implementation time, I believe that it's crucial to learn how to use Lottie files. We'll also learn how create a beautiful sign up and login experience using forms and Firebase authentication. Finally, it'll be time to publish our app to the Android and iOS app stores.

Updating Expo

npm install -g expo-cli

Existing Project

If you haven't installed the latest version of the project, you can do so by going to your Downloads folder and run this code in Terminal.

git clone https://github.com/MengTo/react-native-for-designers.git
cd react-native-for-designers
npm install
expo start

Install Git on Windows

Download Git for Windows and double-click on installer file. For every step, click next until completion. Make sure to restart VSCode, go to Integrated terminal (Control + ~) and test this command. This will show a list of commands that you can run with git.

git
git clone https://github.com/MengTo/react-native-for-designers.git
cd react-native-for-designers
npm install
expo start

VSCode Extensions

The extensions are the same as Part 1. There is just one tiny change, it's the Material Theme Icons extension that is now separate from Material Theme. You have to install that separately.

Turn off Parameter Hints (optional)

But first, when you type code in VSCode, the hints can get pretty annoying. To turn off those pesky auto-suggestions, go to Settings, search for parameter and turn off Parameter Hints.

Changing Home Screen

When you work with specific screens, you might want to temporarily change your first screen to ProjectsScreen.js. Like this, every time you refresh, it will go directly to the desired screen. To make this change, go to TabNavigator.js and put the ProjectsStack first in the list.

// Line 76
const TabNavigator = createBottomTabNavigator({
  ProjectsStack, // First screen
  HomeStack,
  CoursesStack
});

Basic Card

Let's start by changing the background color in ProjectsScreen.js.

const Container = styled.View`
  background: #f0f3f5;
`;

Let's set up a basic Stateful component for each card. Create a Project.js in the components folder.

import React from "react";
import styled from "styled-components";

class Project extends React.Component {
  render() {
    return (
      <Container />
    );
  }
}

export default Project;

const Container = styled.View`
  width: 315px;
  height: 460px;
  border-radius: 14px;
  background-color: blue;
`;

In ProjectsScreen.js, let's include the newly created component.

// Inside Container
<Project />

Importing Gestures

In order to start using gestures, we need to import the PanResponder and Animated components from React Native.

// ProjectsScreen.js
import { PanResponder, Animated } from "react-native";

Pan State

We'll need to set an Animated state called pan. We're using the ValueXY because it will contact both the x and y positions.

state = {
  pan: new Animated.ValueXY()
};

Declaring and Enabling Gestures

In order to use gestures, we'll need to configure it from PanResponder. Here, we're declaring a new _panResponder and we're enabling the capture of the swipe gestures by setting onMoveShouldSetPanResponder to true in componentWillMount.

componentWillMount() {
  this._panResponder = PanResponder.create({
    onMoveShouldSetPanResponder: () => true,
  });
}

Gesture Events

For swipe gestures, we have access to a bunch of events. Typically, there are 3 main ones:

When the user starts swiping (onPanResponderGrant). Here, we can use this event to start a background animation, or a color change.
When the user is swiping (onPanResponderMove). This is useful for moving the card during drag since we get direct values to apply to the card.
When the user releases (onPanResponderRelease). We'll be using this event to return the card to its initial position after release. We can also do things like drop the card depending on positioning.
```
onPanResponderGrant: (e, gestureState) => {
// We'll take care of this later.
},
```
This will make the card move as you swipe. Since we're using Animated values, we have to Animated to change the states. In this case, we're changing the x and y position.
```
onPanResponderMove: Animated.event([
null,
{ dx: this.state.pan.x, dy: this.state.pan.y }
])
```

When released, you want your card to come back to its initial position. We're using Animated.spring to give a nice bounce effect.

onPanResponderRelease: () => {
  Animated.spring(this.state.pan, { toValue: { x: 0, y: 0 } }).start();
}

Apply Animated Wrapper

We need to apply the Animated properties to our Card, so we'll wrap it inside an Animated.View where we can add the style properties. Also, we're applying all the arguments from _panResponder that we declared earlier. The triple dots signifies that it's a list of parameters applied to the components.

<Animated.View
  style={{
    transform: [
      { translateX: this.state.pan.x },
      { translateY: this.state.pan.y }
    ]
  }}
  {...this._panResponder.panHandlers}
>
  // <Project />
</Animated.View>

Project Styling

Let's apply the rest of the styling for our Card in Project.js, along with props. This will allow us to have unique props for each card.

import React from "react";
import styled from "styled-components";

class Project extends React.Component {
  render() {
    return (
      <Container>
        <Cover>
          <Image source={this.props.image} />
          <Title>{this.props.title}</Title>
          <Author>by {this.props.author}</Author>
        </Cover>
        <Text>{this.props.text}</Text>
      </Container>
    );
  }
}

export default Project;

const Container = styled.View`
  width: 315px;
  height: 460px;
  border-radius: 14px;
  background-color: white;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
`;

const Cover = styled.View`
  height: 290px;
  border-top-left-radius: 14px;
  border-top-right-radius: 14px;
  overflow: hidden;
`;

const Image = styled.Image`
  width: 100%;
  height: 290px;
`;

const Title = styled.Text`
  position: absolute;
  top: 20px;
  left: 20px;
  font-size: 24px;
  font-weight: bold;
  color: white;
  width: 300px;
`;

const Author = styled.Text`
  position: absolute;
  bottom: 20px;
  left: 20px;
  color: rgba(255, 255, 255, 0.8);
  font-size: 15px;
  font-weight: 600;
  text-transform: uppercase;
`;

const Text = styled.Text`
  font-size: 17px;
  margin: 20px;
  line-height: 24px;
  color: #3c4560;
`;

Import Project

Now that the Project component is done, let's import that to the ProjectsScreen.js. We're passing a bunch of props to the first card since that's the only one we're dealing with at the moment.

import Project from "../components/Project";

<Project
  title="Price Tag"
  image={require("../assets/background5.jpg")}
  author="Liu Yi"
  text="Thanks to Design+Code, I improved my design skill and learned to do animations for my app Price Tag, a top news app in China."
/>

Download source files

Download the videos and assets to refer and learn offline without interuption.

Design template

Source code for all sections

Video files, ePub and subtitles

Videos

ePub

Assets

Subtitles

React Native Gestures

Build a cross-platform app with gestures and a persistent login experience

28:46

Advanced Gestures

Adding states, data and events to gestures

16:09

Looping the Cards

Create a seamless experience with dynamic data and gestures

16:41

Animated Transition

Adding a full-screen animation to the cards

16:36

Managing Gestures

Enabling and disabling gestures with Redux

22:29

Input and Keyboard

Create a login flow with text fields and a submit event

27:14

Lottie Animation Files

Use JSON assets for success and loading animations

21:23

Managing the Login modal and showing messages

14:43

Firebase Authentification

Making an API connection to Firebase and dealing with the response

10:51

Persistent Data

Store your data so that it persists after refresh

16:27

AsyncStorage with Redux

Make your persistent data work with Redux

14:27

Publish to Android and iOS

Shipping your project to the App Store

16:22

Meet the instructor

We all try to be consistent with our way of teaching step-by-step, providing source files and prioritizing design in our courses.

Meng To

I design, code and write

Meng To is the author of Design+Code. Meng started off his career as a self-taught designer from Montreal and eventually traveled around the world for 2 years as his US VISA was denied. During his travels, he wrote a book which now has 35,000 readers.

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