How to add a button in React Native?

Question

I´m confused with this whole \"no CSS\" thing, but I understand why it\'s beneficial. All I want to do is place a button in the middle of the screen but I don\'t understand how

Answer 1

export default class Login extends React.Component {
  barcodeAction = () => {
    this.props.navigation.navigate('BarCodeScanner')
  }

  cleverTapAction = () => {
    this.props.navigation.navigate('CleverTapApp')
  }
} 

render() {
    return (
      <View style={styles.container}>
        <View style={styles.buttonContainer}>
          <Button
            onPress={this._onPressButton}
            title="Press Me"
          />
        </View>
        <View style={styles.buttonContainer}>
          <Button
            onPress={this._onPressButton}
            title="Press Me"
            color="#841584"
          />
        </View>
        <View style={styles.alternativeLayoutButtonContainer}>
          <Button
            onPress={this._onPressButton}
            title="This looks great!"
          />
          <Button
            onPress={this._onPressButton}
            title="OK!"
            color="#841584"
          />
        </View>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
   flex: 1,
   justifyContent: 'center',
  },
  buttonContainer: {
    margin: 20
  },
  alternativeLayoutButtonContainer: {
    margin: 20,
    flexDirection: 'row',
    justifyContent: 'space-between'
  }
});

Answer 2

You can use built in react-native Button element.

import React, { Component } from 'react';
import { StyleSheet, View, Button, Alert, AppRegistry } from 'react-native';

class MainApp extends Component {

_onPress() {
  Alert.alert('on Press!');
 }

  render() {
    return (
      <View style={styles.container}>
        <View style={styles.buttonContainer}>
          <Button onPress={this._onPress} title="Hello" color="#FFFFFF" accessibilityLabel="Tap on Me"/>
        </View>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#FFFFFF'
  },
  buttonContainer: {
    backgroundColor: '#2E9298',
    borderRadius: 10,
    padding: 10,
    shadowColor: '#000000',
    shadowOffset: {
      width: 0,
      height: 3
    },
    shadowRadius: 10,
    shadowOpacity: 0.25
  }
})

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

Read More Here.

Answer 3

The react-native-button package provides a button that is styled like a native button. Install it with npm install react-native-button and use it in your component like this:

var Button = require('react-native-button');

var ExampleComponent = React.createClass({
  render() {
    return (
      <Button
        style={{borderWidth: 1, borderColor: 'blue'}}
        onPress={this._handlePress}>
        Press Me!
      </Button>
    );
  },

  _handlePress(event) {
    console.log('Pressed!');
  },
});