didUpdateLocations delegate of CLLocationManager is not called in iOS 11 and Xcode 9.1

Question

Hi have to fetch device current location and for this I am using CLLocationManager class but didUpdateLocations is not calling.

I am

My code and plist are below:

Answer 1

<key>NSLocationAlwaysUsageDescription</key>
    <string>Requires GPS to track persons</string>
    <key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
    <string>Requires GPS to track persons</string>
    <key>NSLocationWhenInUseUsageDescription</key>
    <string>Requires GPS to track persons</string>
    <key>UIBackgroundModes</key>
    <array>
        <string>fetch</string>
        <string>location</string>
    </array>

add this in viewdidLoad

locationManager.delegate = self
   self.locationManager.allowsBackgroundLocationUpdates = true
   self.locationManager.startUpdatingLocation()