Is there any way to learn under iOS using C code how many times the battery has been charged?
Thanks.
Not via any public APIs. According to the UIDevice documentation, it appears the most you can do is get the battery charge level, its state, and enable battery monitoring.
Get Device Battery State
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I have been learning about swift for sometimes. I have made an test app that shows user Battery Level and Storage details of the phone. Now i am exploring other possibilities. Is there anyway i can show the Battery Level of AirPods that are connected to the corresponding Device? If anyone has any solution or Guideline, that will be much Appreciated.
Some of my users ran into an issue where they couldn't fetch the location using Location Service.
In the screenshots they sent me, i noticed that the battery level was really low, like 2-5%.
My question is, does iOS stop the location service when the device is running out of battery?
Thanks
Enabling Low Power Mode (the one that turns the battery icon yellow) does several things to reduce the battery usage of your device. This probably includes the accuracy and refresh rate of the GPS.
If you're requesting a location with a high level of accuracy, the system might either take too long and timeout or just decide not to fulfill that request since the hit on the battery would be too much.
does iOS stop the location service when the device is running out of battery
It certainly might. The GPS is one of the highest power draws of all the sensors. Turning it off would make a lot sense. See also Apple's own statements about low power mode:
https://support.apple.com/en-us/HT205234
Note that if this is the case, it would hardly be an issue with your app. Your app might use a lot of battery, which could be a problem; but if location services itself is affected, all map/navigation apps would be affected.
I have developed an application for iPhone that runs in the background with GPS mode on. I need to ask the server if there are any new tasks for the user? Fir this purpose, I have added the code in the didUpdateToLocation method. Now the problem is that it consumes the battery very fast. Please guide me how to avoid the battery consumption. Also, I need to keep the location accuracy at best.
Also, is there any other way where I can communicate to the server even while the app is running in the background. Please help me, I will be really grateful.
It is impossible to get accurate location without using internal GPS in the current state of iPhone. Since essentially you are keeping the GPS alive during the running of the app (not sure if Multitasking API allows GPS calling in background though), it would consume lots of battery power without doubt.
In this case, you either have to avoid calling GPS as much, or live with coarse locations from the cellar towers. You can't have both frequent GPS results and nice battery consumption.
I see a lot of apps that use GPS in the iPhone have the following warning in the App Description:
Warning: Continued use of GPS running in the background can dramatically decrease battery life.
If an App uses the background processes (like startMonitoringSignificantLocationChanges or Region Monitoring) Apple suggested that the battery life would not be affected significantly. So if I use these background location services, do I still have to have this warning in my App Description?
Is there any guideline from Apple for this? What do people generally use as a "Best Practice"
Thanks,
Mark
Take a look at this:
http://answers.oreilly.com/topic/325-how-to-effectively-use-core-location-in-your-iphone-app/
Usually, you don't want to update the user's location until you REALLY need it, or the app will only be running for a few minutes (like the app to find your parked car).
Apple's developer website describe 3 types of background services an app can use, music, location and VoIP.
When they describe background location services they talk about 2 types of apps: critical and non-critical apps. A GPS navigation app falls into the 'critical' category, and location based social networks like Gowalla and Loops falls into the non-critical category.
I have several questions
I'm building a location based social network, like Google Latitude. this kind of app fall under the 'non-critical' category. these apps are woken up by the OS whenever the phone switches cellular towers. How often is that? how accurate is that? will 100 meter change wake up the app?
I was wondering if there is a way for an application to wake up every 2 minutes to sample the GPS and go back to sleep? 2.
I hear there are new Alerts feature that you can schedule in advance. can these alerts wake up the app, or are they only textual notification?
What if I register a thread as a critical-location thread, so I have full background activity and gps access. will Apple not approve my app?
Thanks!
As far as I know:
That depends on the Cell Coverage in your area. Might be 100m, might be 2km.
As far as I know not.
That's only the notification (like a push notification does not wake up the app)
It may be approved, but users will complain about unnecessary battery draining.