I'm developing an app on apple watch which needs continuous access to gyroscope and accelerometer data. But once the watch rotates, the screen turns off and apparently it stops accessing motion data while the screen is off. I tried to keep the screen on but apple watch doesn't have that feature, any thoughts around this?
Thanks
You'll need to start an HKWorkoutSession.
The app can continue to access data from Apple Watch’s sensors in the background, letting you keep the app up to date at all times. For example, a running app can continue to track the user’s heart rate, ensuring that the most recent heart rate data is displayed whenever the user raises their wrist.
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invoke a alarm when someone touched the iPhone or iPad and a app is running in background.
this is happening into a ios app i.e. iAntiTheft
iAntiTheft is not using the location i checked the permission of the app, in a scenario i put the app in background activating motion alert and device get's locked after some time, now i pick the device, it immediately show a Notification and start alarm on high volume.
one More thing here to notice it always playing a low volume beep beep after enabling the motion sensor alert. any help appreciated.
how can i achieve this.
The answer to get Core Motion Update when the app is in background and the device locked. in both case just put an audio with background mode playing after the core motion updates function, now the device will go to background or get locked you always getting the core motion coordinates updates
Repo Link Providing soon
I have an app using accelerometer. When a certain motion is detected, i am trying to make my iphone vibrate. While the app is in the foreground, and I conduct a certain motion, it vibrates. But it does not when the app is in the background.
I have a counter that detects this motion. When I execute this motion while in the background for three times, although it does not emit any vibration, after I transition back to foreground, the counter is increased by three. So I know the accelerometer is working. Or is putting the motions in a queue and executing it when the app comes back to foreground.
And I'm not making a rookie mistake by touching the phone's vibrate to off.
I'm quite not sure where to go from here. Is iphone inherently not capable of capturing and processing accelerometer data while in the background? Or is there something I'm not doing correctly?
In iOS there are only a certain type of activities allowed in background. Here you can check them: Background Modes.
I'm currently working in an app that uses sensors like the accelerometer and I get updates from it using the CoreLocation delegate method didUpdateLocation, since using the GPS to locate the device is one of the Apple allowed background modes. I hope this helps you!
It's seems no way to get realtime Accelerometer data on WatchOS after wrist down ,screen is off. get data from CMMotionManager will stop after seconds for Apple's battery care.
You can query data from HKWorkoutSession in background ,for example: step count、calories、heart beats rate ,but it cannot query Accelerometer data or CMDeviceMotion data.
I google it a lot and I test with this code.
https://developer.apple.com/videos/play/wwdc2016/713/
WWDC sample code download
It's not accurate because of screen off problem. It will not print CMDeviceMotion data in XCode when your screen off .
Someone says MSensorRecorder maybe work, but it has 3 sec delay.
Is there a way to get this?
When screen is off, your app is being suspended. So, your the problem is not "CMMotionManager does not give data when screen is off", but "my app is not running when screen is off".
As a workaround, you can start workout: while workout is active, your app will be running in background and you can continue requesting data from CMMotionManager same way as you are doing it now. But be careful: app can not use more than 15% of CPU while running in background workout, else it will be killed by watchdog.
Watch this WWDC videos for more details on workout and background modes: Building Great Workout Apps, Keeping Your Watch App Up to Date,
Architecting for Performance on watchOS 3
I am wondering how I can keep receiving motion sensor values while the app is in background mode. I realize that there are already several posts out there. For example, I have tried How Nike+ GPS on iPhone receives accelerometer updates in the background? which does not work for me.
I have also enabled background modes (location updates at the moment) in my App-Info.plist.
Are there any working examples out there? Also, if possible, I would not want to implement some of the hacks, e.g. play silent audio or get the user's location. Apps such as SleepCycle seem to be able to have achieved this without any workarounds.
I'd be grateful for any help.
Moves app on iOS geolocates your movements throughout the day even when the app is inactive. In addition to this it also appears to analyse core motion data to identify if you have walked, cycled or taken another form of transport (walking with your phone in a suitcase on wheels reports as a cycle).
What iOS methods and techniques can the Moves app use to continuously capture this data without the application having been open? Geofencing? Background processes?
You can register an app to continue operating in the background. Have a look here at the Background Execution and Multitasking section. http://developer.apple.com/library/ios/#DOCUMENTATION/iPhone/Conceptual/iPhoneOSProgrammingGuide/ManagingYourApplicationsFlow/ManagingYourApplicationsFlow.html