iOS App gets invalid user location - ios

Question

when I'm trying to show the user location on my map it shows the location is somewhere in the ocean (lat = 0.000 , lon = 0.000) , I have set the simulated location to be in london and still nothing.
when i try to compile the app on my iphone its doesn't ask for permission to get user current location , just when i enable the app for using location services in the iphone settings , the app shows the user current location.
any idea why it does it?
this is my viewDidLoad :
_locationManager = [[CLLocationManager alloc] init];
_locationManager.delegate = self;
_locationManager = [[CLLocationManager alloc] init];
if(IS_OS_8_OR_LATER) {
[_locationManager requestWhenInUseAuthorization];
[_locationManager requestAlwaysAuthorization];
}
_locationManager.distanceFilter = kCLDistanceFilterNone; // whenever we move
_locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[_locationManager startUpdatingLocation];

Answer 1

There is no need to adding both they both do different things
[_locationManager requestWhenInUseAuthorization];
[_locationManager requestAlwaysAuthorization];
requestWhenInUseAuthorization
use [_locationManager requestWhenInUseAuthorization]; when you want to get location updates when app is Active of foreground mode and not when in background .
requestAlwaysAuthorization
use [_locationManager requestAlwaysAuthorization]; when you want to get location updates Even when your app is in background mode. So OS would ask for permissions accordingly
Adding Keys to info.Plist
It is now mandetory to add either NSLocationWhenInUseUsageDescription or NSLocationAlwaysUsageDescription Key to your info.Plist depending upon which permission you are asking for .
The value to this key should be a NSString explaining user why the app wants to use location services something like "We need your location for XYZ reason"
If iOS does not find above key in your Plist file , it will ignore location request.
Hope this helps. By the way I reccomand you to watch WWDC 2014 video "Whats new in Core Location", all iOS8 changes have been nicely explained.
Other Changes in Code
Also one more thing i see in your code , You are creating new instance of _locationManager in 3rd line , Means you are creating new object after assigning delegate to locationManager, should not do that too.