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Attempts at implementing background tasks in React Native iOS
//
// BackgroundTask.h
// tomtrack
//
// Created by Liam Edwards-Playne on 13/02/2016.
//
#import "RCTBridgeModule.h"
@interface BackgroundTask : NSObject <RCTBridgeModule>
@end
//
// BackgroundTask.m
// tomtrack
//
// Created by Liam Edwards-Playne on 13/02/2016.
//
#import <Foundation/Foundation.h>
#import "BackgroundTask.h"
#import "RCTUtils.h"
/*
Sample:
BackgroundTask.beginBackgroundTask("gpsTracking", () => {})
*/
@implementation BackgroundTask
RCT_EXPORT_MODULE();
#pragma mark - Public API
RCT_EXPORT_METHOD(beginBackgroundTask:(NSString *)taskName jsCallback:(RCTResponseSenderBlock)jsCallback)
{
UIApplication *application = RCTSharedApplication();
__block UIBackgroundTaskIdentifier bgTask = [application beginBackgroundTaskWithName:taskName expirationHandler:^{
// Clean up any unfinished task business by marking where you
// stopped or ending the task outright.
[application endBackgroundTask:bgTask];
bgTask = UIBackgroundTaskInvalid;
}];
// Start the long-running task and return immediately.
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
printf("Running in the background\n");
// Call the JS code
jsCallback(@[]);
printf("Back from the JS\n");
[application endBackgroundTask:bgTask];
bgTask = UIBackgroundTaskInvalid;
});
}
@end
var BackgroundTask = require('react-native').NativeModules.BackgroundTask;
BackgroundTask.beginTask("taskName", function(){})
@easilyBaffled

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commented Mar 22, 2016

Do you think this would allow me to maintain a socket connection in the background, while my screen is off? I have been trying to make a running app that communicates with a server with socket, http://stackoverflow.com/questions/35458549/how-to-run-socket-io-in-the-background-on-ios-in-a-react-native-app, but I can't find a way to keep the socket connection alive. I've even tried the react-native-background-geolocation, but ran into different problems there.

@puredazzle

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commented Apr 7, 2016

Hi, do you have any more information on how to use this? Is it suppose to be used as an request Animation frame? Thanks.

@arvindnrbt

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commented Mar 13, 2018

@easilyBaffled Hey, did you succeed in maintaining a socket connection in the background? I'm looking for a way to do that.

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