How does Whatsapp continue to receive notifications of received messages, even after you kill the app or restart the phone?
I am using an application that sends location coordinates, and it's for iOS, written in Swift.
My problem is that when I kill the app, the application stops sending coordinates. How I can make it restart automatically? For example, Whastapp, despite killing the app, if someone sends me a message, I receive the notification
I have also tried creating a widget app, but this is activated only when under the bar where the widget exists.
WhatsApp continues receiving PushNotifications. These are sent by Web Server and the App need not be active for it.
Coming to your requirement, you can use options like requestAlwaysAuthorization (to keep App awake in background to be able to send notifications). SignificantLocationChange, RegionMonitoringService, VisitService (to relaunch you app in the background if terminated).
Hope it helps.
Use this tutorial https://www.raywenderlich.com/123862/push-notifications-tutorial. you need to have one developer account to use push notification. It's easy to implement.
Related
I am having an issue trying to have an ongoing location tracking enabled when the following conditions are in place:
Background fetch is disabled
App is killed
When the above happens, location updates are stopped. I tried to have my server send push notifications to wake the app up but they do not arrive if the app is killed.
What is puzzling is that a similar functionality seems to work just fine on WhatsApp (the live location). On WhatsApp, even if I disable background fetch and kill the app, it somehow manages to wake it up again to send updated location information.
Does anyone have any idea on what they are doing?
It seems WhatsApp could be using PushKit to get around this problem. According to this question:
WhatsApp could be using VOIP background mode along with PushKit for
solving this problem.
Voip pushes are:
delivered directly to the app.
considered high-priority notifications and are delivered without delay.
delivered even if the app was force-quit by the user.
I have also created a quick sample app to try this and it works like a charm. However, again according to the question linked, Apple doesn't really allow this solution:
Apple no longer allows the usage of the API for push notifications of non-VOIP apps. They do however allow WhatsApp to do it in their infinite fairness.
Use significant-change location services. It will work even the app is terminated.
I have a question,
I work on a Swift 3 project with Xcode.
My goal is to send an alert sms, 20 secondes after receiving a local notification. when I'm in application, every things work well, but when my app is in background, it can do other tasks, like print some character, or play music, or send a text to a socket server, but it can't send the sms.
I think, when I receive an alert, if I could back to my application automatically, then I can send an alert sms, that's why I'm doing this stupide idea and looking for a way to know how I can wake up automatically my application and go back to the first View Controller Screen when I receive a Local Notification?
Maybe there is someone who knows a method to return to the iOS application automatically?
When your app is launched into the background—usually to handle some type of background event—the launch cycle changes slightly as given in the picture below. The main difference is that instead of your app being made active, it enters the background state to handle the event and may be suspended at some point after that. When launching into the background, the system still loads your app’s user interface files but it does not display the app’s window.
Reference - https://developer.apple.com/library/content/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/StrategiesforHandlingAppStateTransitions/StrategiesforHandlingAppStateTransitions.html
Bringing your app from background to foreground is not possible. And even if you are able to do so, App store will reject it.
Hope it helps!
I am creating an IOS application that makes use of PUSH notifications. When I send a PN, I send data to my application. IF my app is not active, I can then click the notification in the notification center to update the data in the app. However, IF I do not click the notification and I just resume the app via the launch screen, the app does not update correctly. Is there a way to update the apps pending notifications even if I don't press the notification center button and I just resume the app from the launch icon?
I have been scouring the internet with no luck. I have also tried to put the notification in a NSMUtable Array in the application delegate with no luck.
thank you in advance.
Without you having a list of notifications that the app can download from the server you won't have a consistent solution so that is the best bet.
If you turned on background fetch for your notifications then the app could maintain a list of the received notifications, but this approach would fail for any notifications coming in after the user had force quit the app.
Is it possible to wake up a background application with a non ios notification center? e.g. if I were creating a calling or messaging application is it possible to wake the application via SMS.
Nope. If you want to call app outside the device, you should use APNS. On the device you can use local notification. Sending SMS to wake up app is kinda wrong. People don't like such solutions - imagine bunch of SMS every day for different apps. Sorry.
No.
If you have background code running, you can schedule a local notification to yourself. If the user clicks "Ok" then you will come to the foreground. See here for a description and sample code.
As far as I can tell, the only ways to launch an app without user input is via a custom URL handler or via an accessory. It doesn't sound like an accessory fits your use case. Sadly you can't open URLs from the background, so you can't use this to wake yourself.
Quick question, I am working on an APNS enabled app and I just want to know if there is a way that when the app is not open (not in background) and the app receives a remote notification;
Can I open the app in the background, unbeknownst to the the user, and do do what needs to be done.
I have looked at the docs but it doesnt explicitly say that this can or cannot be done (from what I read), it says that the user has to open the app manually (either from tapping an alert or the app icon).
I think it is clear what I'm looking to do however i'll put an example aswell.
Example)
The default Mail app alerts the user of new emails with a badge icon, showing the number of new emails, aswell as a sound. The user must then tap the app icon to open the app and download the new emails.
I want to be able to have the badge and sound but open the app in the background (silently) and download the new emails, so that when the user does get around to opening the app the emails will already be there, ready to read.
Thanks for any help.
unfortunately, what you describe is not possible.
the only way you could get something like that is to build a voip app. see the relevant section in this document.
Implementing a VoIP Application
A Voice over Internet Protocol (VoIP) application allows the user to make phone calls using an Internet connection instead of the device’s cellular service. Such an application needs to maintain a persistent network connection to its associated service so that it can receive incoming calls and other relevant data. Rather than keep VoIP applications awake all the time, the system allows them to be suspended and provides facilities for monitoring their sockets for them. When incoming traffic is detected, the system wakes up the VoIP application and returns control of its sockets to it.
anyway, I doubt that your app would get into the App Store, then...