This is an Example of React Native Timer and Stopwatch. To make a Stopwatch and Timer we have a very good library called react-native-stopwatch-timer. It will provides Stopwatch and Timer component.
React Native Timer and Stopwatch
A Stopwatch is a special watch which can be used to count the time. In stopwatch time starts from zero and run until we stop it but Timer is the exact opposite of it. In the Timer, we decide the time to count and it counts towards zero.
Stopwatch
1 2 3 4 5 6 7 8 9 | <Stopwatch laps msecs start={this.state.isStopwatchStart} //To start reset={this.state.resetStopwatch} //To reset options={options} //options for the styling getTime={this.getFormattedTime} /> |
Timer
1 2 3 4 5 6 7 8 9 10 11 12 13 | <Timer totalDuration={this.state.timerDuration} msecs //Time Duration start={this.state.isTimerStart} //To start reset={this.state.resetTimer} //To reset options={options} //options for the styling handleFinish={handleTimerComplete} //can call a function On finish of the time getTime={this.getFormattedTime} /> |
In this example, we will make a Stopwatch and a Timer. The Timer will show the count down from the given Millisecond. So Let’s get started.
To Make a React Native App
Getting started with React Native will help you to know more about the way you can make a React Native project. We are going to use react-native init to make our React Native App. Assuming that you have node installed, you can use npm to install the react-native-cli command line utility. Open the terminal and go to the workspace and run
npm install -g react-native-cliRun the following commands to create a new React Native project
react-native init ProjectNameIf you want to start a new project with a specific React Native version, you can use the --version argument:
react-native init ProjectName --version X.XX.Xreact-native init ProjectName --version react-native@nextThis will make a project structure with an index file named App.js in your project directory.
Installation of Dependency
To use Stopwatch and Timer you need to install react-native-stopwatch-timer package.
To install this open the terminal and jump into your project using
1 | cd ProjectName |
Run the following command
1 | npm install react-native-stopwatch-timer --save |
This command will copy all the dependencies into your node_module directory, You can find the directory in node_module directory named react-native-stopwatch-timer.
–save is optional, it is just to update the react-native-app-intro-slider dependancy in your package.json file.
Now Open App.js in any code editor and replace the code with the following code.
App.js
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 | /*This is an Example of Timer/Stopwatch in React Native */ import React, { Component } from 'react'; //import React in our project import { StyleSheet,Text,View, TouchableHighlight } from 'react-native'; //import all the required components import { Stopwatch, Timer } from 'react-native-stopwatch-timer'; //importing library to use Stopwatch and Timer export default class TestApp extends Component { constructor(props) { super(props); this.state = { isTimerStart: false, isStopwatchStart: false, timerDuration: 90000, resetTimer: false, resetStopwatch: false, }; this.startStopTimer = this.startStopTimer.bind(this); this.resetTimer = this.resetTimer.bind(this); this.startStopStopWatch = this.startStopStopWatch.bind(this); this.resetStopwatch = this.resetStopwatch.bind(this); } startStopTimer() { this.setState({isTimerStart: !this.state.isTimerStart, resetTimer: false}); } resetTimer() { this.setState({isTimerStart: false, resetTimer: true}); } startStopStopWatch() { this.setState({isStopwatchStart: !this.state.isStopwatchStart, resetStopwatch: false}); } resetStopwatch() { this.setState({isStopwatchStart: false, resetStopwatch: true}); } getFormattedTime(time) { this.currentTime = time; } render() { return ( <View style={{flex:1,justifyContent:'center',alignItems:'center'}}> <View style={{flex:1,marginTop:32, alignItems:'center', justifyContent:'center'}}> <Stopwatch laps msecs start={this.state.isStopwatchStart} //To start reset={this.state.resetStopwatch} //To reset options={options} //options for the styling getTime={this.getFormattedTime} /> <TouchableHighlight onPress={this.startStopStopWatch}> <Text style={{fontSize: 20, marginTop:10}}> {!this.state.isStopwatchStart ? "START" : "STOP"} </Text> </TouchableHighlight> <TouchableHighlight onPress={this.resetStopwatch}> <Text style={{fontSize: 20, marginTop:10}}>RESET</Text> </TouchableHighlight> </View> <View style={{flex:1,marginTop:32, alignItems:'center', justifyContent:'center'}}> <Timer totalDuration={this.state.timerDuration} msecs //Time Duration start={this.state.isTimerStart} //To start reset={this.state.resetTimer} //To reset options={options} //options for the styling handleFinish={handleTimerComplete} //can call a function On finish of the time getTime={this.getFormattedTime} /> <TouchableHighlight onPress={this.startStopTimer}> <Text style={{fontSize: 20, marginTop:10}}> {!this.state.isTimerStart ? "START" : "STOP"} </Text> </TouchableHighlight> <TouchableHighlight onPress={this.resetTimer}> <Text style={{fontSize: 20, marginTop:10}}>RESET</Text> </TouchableHighlight> </View> </View> ); } } const handleTimerComplete = () => alert("Custom Completion Function"); const options = { container: { backgroundColor: '#FF0000', padding: 5, borderRadius: 5, width: 200, alignItems:'center', }, text: { fontSize: 25, color: '#FFF', marginLeft: 7, } }; |
To Run the React Native App
Open the terminal again and jump into your project using.cd ProjectNamereact-native run-androidreact-native run-ios (macOS only).
That was the React Native Timer and Stopwatch. If you have any doubt or you want to share something about the topic you can comment below or contact us here. There will be more posts coming soon. Stay tuned!
Hope you liked it. 🙂
how to get the stopwatch current time ??
You can see getFormattedTime method which is called when the stopwatch time changes.
getFormattedTime(time) {
this.currentTime = time;
}
You can make a global variable and define the value into it and whenever you want to know the current time you can access it from that variable.
i have create the global variable and define the value into it. but it is not working and you make some code which will help.
Are you asking for this? https://aboutreact.com/react-native-global-scope-variables/