在苹果市场的背景下使用nsTimer接受位置跟踪应用程序

Question

I have created this location tracking app, that uses nstimer in background to fetch location every 4 mins. I am wondering if there will be any problem in submitting the app in the market place.. If you know something regarding it, can you please let me know. Thanx.

Answer 1

I've gotten one app through. You have to make sure that the user is informed exactly as to what is going on. So dialogs have to be very specific and have a privacy policy in place.

4 minutes is a little bit extreme if that's a permanent state of your app.. I don't think Apple would allow that if they found it during app review. Would it not suffice to just have it updated based on movement? ie. the significant location change api?

The app I did this for used significant location change api for background location tracking and then stepped it up to higher frequency tracking if the app was actually open.

Answer 2

If it's relevant to what your app is doing I don't think it will be a problem.
This is from Apple's App Store Review Guidelines :

4.1 Apps that do not notify and obtain user consent before collecting, transmitting, or using location data will be rejected

4.2 Apps that use location-based APIs for automatic or autonomous control of vehicles, aircraft, or other devices will be rejected

4.3 Apps that use location-based APIs for dispatch, fleet management, or emergency services will be rejected

4.4 Location data can only be used when directly relevant to the features and services provided by the app to the user or to support approved advertising uses

But pay attention that if you want your app to keep getting location updates even in background, you need to declare this in your plist file, otherwise when the app goes to background you won't be able to get location updates.

Declaring Your App's Supported Background Tasks

Support for some types of background execution must be declared in advance by the app that uses them. An app declares support for a service using its Info.plist file. Add the UIBackgroundModes key to your Info.plist file and set its value to an array containing one or

location —The app keeps users informed of their location, even while it is running in the background.