iOS应用终止状态下位置访问的技术实现及审核问询

Hey there, let’s tackle your three questions one by one—these are super common hurdles when building location-aware iOS apps, so I’ve got some hands-on insights to share:

1. How to get user location even when the app is terminated? #

The code you’re using (locationManager.allowsBackgroundLocationUpdates = true + locationManager.startUpdatingLocation()) works for foreground/background scenarios, but it won’t keep running once the app is terminated by the system or user. To handle the terminated state, you need to use one of Apple’s low-power location monitoring mechanisms:

• Significant Location Changes: This is the most reliable option for terminated-state updates. It wakes your app only when the user moves a significant distance (usually a few hundred meters, or when cell towers change) to save battery.

  • To set this up, call:

    locationManager.startMonitoringSignificantLocationChanges()
    

  • When a significant change happens while your app is terminated, iOS will launch it in the background briefly. You can catch this in application(_:didFinishLaunchingWithOptions:) by checking for the UIApplicationLaunchOptionsKey.location key, then reinitialize your location manager to grab the latest location.

• Geofencing (Region Monitoring): If your use case involves tracking when the user enters/exits a specific area, you can set up geofences. iOS will wake your app even when terminated when the user crosses the region boundary.

Also, don’t forget to:

• Enable the Location updates background mode in your app’s target settings.
• Request the NSLocationAlwaysAndWhenInUseUsageDescription (for iOS 13+) in your Info.plist, clearly explaining why you need location access even when the app isn’t active.

2. Does location retrieval depend on the network? #

It depends on the type of location data you’re getting:

• Raw GPS coordinates: No network needed. Your device uses satellite signals to calculate position, though this can take longer to get a fix (especially indoors) and uses more battery.
• Wi-Fi/Cell Tower positioning: Yes, this requires a network. These methods use nearby Wi-Fi networks or cell towers to estimate location faster, with lower battery usage—but less precision than GPS.
• Reverse geocoding (converting coordinates to addresses): Definitely needs a network, since this relies on Apple’s servers to map coordinates to location names.

So if you only need latitude/longitude, you can get it without a network, but for faster fixes or address data, you’ll need connectivity.

3. Can such an app pass Apple’s review? #

Yes—but only if your use case is legitimate and transparent. Apple is strict about location privacy, so here’s what you need to do:

• Have a clear, user-facing reason: Your app must require background/terminated location updates for its core functionality. For example, a delivery tracking app, fitness app that logs outdoor runs, or a navigation app makes sense. Apps that request location access without a clear need will get rejected.
• Be transparent in permission prompts: Your Info.plist descriptions must explicitly state why you need location access when the app is in the background or terminated. Vague phrases like "we need your location to improve our service" won’t cut it—be specific, e.g., "Track your run route even when the app is closed to log your workout progress."
• Follow Apple’s guidelines: Stick to low-power mechanisms (like significant location changes) instead of continuous background updates whenever possible. Apple frowns on apps that drain battery unnecessarily.

As long as your app’s location usage is necessary, transparent, and follows Apple’s privacy rules, you should have no trouble passing review.

内容的提问来源于stack exchange，提问作者ios swift