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My Swift app asks to allow access to current location via CLLocationManager. How can I display an alert message when the user taps on "Don't Allow"?
807
There isn't any default functionality which will popup the location permission once the user has denied the permission. You need to show an alert to the user that permission is required, and then redirect the user to Settings screen.
Basic Swift Code for iOS Apps You should check the return value of locationServiceEnabled() method before starting location updates to determine whether the user has location services enabled for the current device.
To show an alert, create some Boolean state that determines whether the alert should be visible, then attach that to an alert() modifier along with all the buttons you want to show in the alert. All buttons dismiss the alert when tapped, so you can provide an empty action for simple dismissal.
Open your phone's Settings app. Under "Personal," tap Location access. At the top of the screen, turn Access to my location on or off.
You want to look at
func locationManager(manager: CLLocationManager, didChangeAuthorizationStatus status: CLAuthorizationStatus)
and
CLLocationManager.authorizationStatus()
The first is invoked when the user changes authorization status and the second will allow you to determine current status at any time.
Then, displaying the message, for example:
let alert = UIAlertController(title: "Your title", message: "GPS access is restricted. In order to use tracking, please enable GPS in the Settigs app under Privacy, Location Services.", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Go to Settings now", style: UIAlertActionStyle.Default, handler: { (alert: UIAlertAction!) in
print("")
UIApplication.sharedApplication().openURL(NSURL(string:UIApplicationOpenSettingsURLString)!)
}))
the code above shows an alert and allows the user to go directly to settings to enable location.
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