获取位置权限对话框的结果

Question

I am doing this tutorial that would return the GPS coordinates. When I run the application on the iPhone, I am first presented with the UIAlertView asking permission to access my GPS coordinates.

I need to know from where this UIAlertView is thrown? Is it from the OS? Can we capture this method? When the user clicks on "Allow" or "Don't allow", can I print his choice to the console?

How can I do this programatically? Is there an event for this?

Answer 1

This alert is shown by the OS. The usage of location-based API must be permitted by the user. You can ask the CLLocationManager for the current authorizationStatus and be notified when the status changes (delegate method will be called). Note that the user also can disable location services later in the settings app.

Answer 2

I assume you are using CLLocationManager. Your delegate will get locationManager:didChangeAuthorizationStatus when the applications ability to use the API changes.

Edit: The first time your application attempts to use the service, the user will be prompted. If the user answers No, your application will not be able to use the service unless they go to Settings->General->Location Services and change the setting for your application.

If you query the API for status and are disallowed, you could put up your own pop-up and instruct the user on how to change the setting for your application.