WWDC Notes

What's new in location

Show Apple's description.
Location technologies are core to delivering context-based services within your app. Discover how the latest privacy controls in Core Location add a whole new dimension to determining position and what that means for your app. We’ll walk you through best practices for implementing these latest location updates and show you how they’re designed to ensure more people get an experience they’re going to love.
  • When apps ask for permission to access user's location, a new option "Precise" has been added
    • This option is also available under Settings for your app
    • Apps cannot opt out of this feature, it's completely under user's control
    • New enum type:
enum CLAccuracyAuthorization {
    case fullAccuracy
    case reducedAccuracy
}
  • API changes to CLLocationManager
    • locationManagerDidChangeAuthorization(_: CLLocationManager) will get called when user change the authorization status or accuracy
  • Location delivery
    • CLLocation objects will be sent to didUpdateLocations, with a center point and large horizontalAccuracy value
    • recomputed about 4 times per hour
  • Demo of Apple Maps with "Precision: Off"
  • When asking for full accuracy:
    • Option 1: Navigate users to Settings app and grant full accuracy permanently. This may not be desirable for users.
    • Option 2: Ask for temporary permission to full accuracy. You need to provide a "purpose key", which is defined in Info.plist(You can have multiple entries to explain why you need full accuracy). Once granted, full accuracy will remain for the rest of the app session.
  • Region monitoring won't work when precise mode is turned off
    • Send users to Settings when it makes sense
  • Accuracy authorization status are synced and shared between iPhone and Apple Watch
  • Best practices:
    • Adapt your app for all values of accuracyAuthorization
    • Background monitoring behavior will change under reducedAccuracy
    • Consider intentionally using reducedAccuracy by default
  • As of iOS 13.4, users may choose to go from "while in use" to "always" without leaving the app. So it's better for developers to ask for .authorizedWhenInUse the first time, and only ask for .authorizedAlways when the user accesses a feature that needs it
  • App clips
    • No Always authorization
    • "While using" becomes "while using until tomorrow"
  • Widgets
    • Get location authorization from parent app, but still needs to specify a key in its Info.plist

Missing anything? Corrections? Contributions are welcome 😃

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Sky Lan

Sky Lan usually does something along the lines of 🍎📚🏀🤔. Current top of mind: Tools for Thought.