A simple modular component for react native (iOS) to capture a signature as an image
Objective-C Java JavaScript Python
Latest commit d291176 Jan 15, 2017 @jedt jedt bump version

README.md

react-native-signature-capture

About this

React Native library for capturing signature

User would sign on the app and when you press the save button it returns the base64 encoded png

iOS

Android

Install

First you need to install react-native-signature-capture:

npm install react-native-signature-capture --save

Second you need to link react-native-signature-capture:

react-native link react-native-signature-capture

Use above react-native link command to automatically complete the installation, or link manually like so:

iOS

  1. In the XCode's "Project navigator", right click on your project's Libraries folder ➜ Add Files to <...>
  2. Go to node_modules ➜ react-native-signature-capture ➜ ios ➜ select RSSignatureCapture.xcodeproj
  3. Add libRSSignatureCapture.a to Build Phases -> Link Binary With Libraries
  4. Compile and have fun

Android

Add these lines in your file: android/settings.gradle

...

include ':reactnativesignaturecapture',':app'
project(':reactnativesignaturecapture').projectDir = new File(settingsDir, '../node_modules/react-native-signature-capture/android')

Add line in your file: android/app/build.gradle

...

dependencies {
    ...
    compile project(':reactnativesignaturecapture') // <-- add this line
}

Add import and line in your file: android/app/src/main/java/<...>/MainApplication.java

...

import com.rssignaturecapture.RSSignatureCapturePackage; // <-- add this import

public class MainApplication extends Application implements ReactApplication {

    private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {

        @Override
        protected List<ReactPackage> getPackages() {
            return Arrays.<ReactPackage>asList(
                new MainReactPackage(),
                new RSSignatureCapturePackage() // <-- add this line
            );
        }
  }

...
}

Usage

Then you can use SignatureCapture component in your react-native's App, like this:

...
import React, {Component} from 'react';
import SignatureCapture from 'react-native-signature-capture';

class CustomComponent extends Component {

  ...
  render() {
    return (
      <SignatureCapture
        {...someProps}
      />
    );
  }
}

Properties

  • saveImageFileInExtStorage : Make this props true, if you want to save the image file in external storage. Default is false. Warning: Image file will be visible in gallery or any other image browsing app

  • showNativeButtons : If this props is made to true, it will display the native buttons "Save" and "Reset".

  • viewMode : "portrait" or "landscape" change the screen orientation based on boolean value

  • maxSize : sets the max size of the image maintains aspect ratio, default is 500

Methods

  • saveImage() : when called it will save the image and returns the base 64 encoded string on onSaveEvent() callback

  • resetImage() : when called it will clear the image on the canvas

Callback Props

  • onSaveEvent : Triggered when saveImage() is called, which return Base64 Encoded String and image file path.

  • onDragEvent : Triggered when user marks his signature on the canvas. This will not be called when the user does not perform any action on canvas.

Example

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 */

var React = require('react');
var ReactNative = require('react-native');

var {Component} = React;

var {
    AppRegistry,
    StyleSheet,
    Text,
    View, TouchableHighlight
} = ReactNative;

import SignatureCapture from 'react-native-signature-capture';

class RNSignatureExample extends Component {
    render() {
        return (
            <View style={{ flex: 1, flexDirection: "column" }}>
                <Text style={{alignItems:"center",justifyContent:"center"}}>Signature Capture Extended </Text>
                <SignatureCapture
                    style={[{flex:1},styles.signature]}
                    ref="sign"
                    onSaveEvent={this._onSaveEvent}
                    onDragEvent={this._onDragEvent}
                    saveImageFileInExtStorage={false}
                    showNativeButtons={false}
                    viewMode={"portrait"}/>

                <View style={{ flex: 1, flexDirection: "row" }}>
                    <TouchableHighlight style={styles.buttonStyle}
                        onPress={() => { this.saveSign() } } >
                        <Text>Save</Text>
                    </TouchableHighlight>

                    <TouchableHighlight style={styles.buttonStyle}
                        onPress={() => { this.resetSign() } } >
                        <Text>Reset</Text>
                    </TouchableHighlight>

                </View>

            </View>
        );
    }

    saveSign() {
        this.refs["sign"].saveImage();
    }

    resetSign() {
        this.refs["sign"].resetImage();
    }

    _onSaveEvent(result) {
        //result.encoded - for the base64 encoded png
        //result.pathName - for the file path name
        console.log(result);
    }
    _onDragEvent() {
         // This callback will be called when the user enters signature
        console.log("dragged");
    }
}

const styles = StyleSheet.create({
    signature: {
        flex: 1,
        borderColor: '#000033',
        borderWidth: 1,
    },
    buttonStyle: {
        flex: 1, justifyContent: "center", alignItems: "center", height: 50,
        backgroundColor: "#eeeeee",
        margin: 10
    }
});

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

Please checkout the example folder (iOS/Android): https://github.com/RepairShopr/react-native-signature-capture/tree/master/Example

Library used:

https://github.com/jharwig/PPSSignatureView

https://github.com/gcacace/android-signaturepad

How to contribute

Submit a PR - also please don't be shy and email me. Lastly, I love to see how this project is doing in the wild! please email me screenshot of your app - jed.tiotuico@gmail.com (I will disclose the info, I will not tell anyone about it, I will not blog nor tweet it)