[ios] Refactor way location permissions are requested

1 files changed, 21 insertions, 27 deletions

diff --git a/platform/ios/src/MGLMapView.mm b/platform/ios/src/MGLMapView.mm
index 2e96931a63..62b943fd3d 100644
--- a/platform/ios/src/MGLMapView.mm
+++ b/platform/ios/src/MGLMapView.mm
@@ -5303,35 +5303,29 @@ public:
 
     if (shouldEnableLocationServices)
     {
-        if (self.locationManager.authorizationStatus == kCLAuthorizationStatusNotDetermined)
-        {
-            BOOL requiresWhenInUseUsageDescription = [NSProcessInfo.processInfo isOperatingSystemAtLeastVersion:(NSOperatingSystemVersion){11,0,0}];
+        if (self.locationManager.authorizationStatus == kCLAuthorizationStatusNotDetermined) {
             BOOL hasWhenInUseUsageDescription = !![[NSBundle mainBundle] objectForInfoDictionaryKey:@"NSLocationWhenInUseUsageDescription"];
-            BOOL hasAlwaysUsageDescription;
-            if (requiresWhenInUseUsageDescription)
-            {
-                hasAlwaysUsageDescription = !![[NSBundle mainBundle] objectForInfoDictionaryKey:@"NSLocationAlwaysAndWhenInUseUsageDescription"] && hasWhenInUseUsageDescription;
-            }
-            else
-            {
-                hasAlwaysUsageDescription = !![[NSBundle mainBundle] objectForInfoDictionaryKey:@"NSLocationAlwaysUsageDescription"];
-            }
 
-            if (hasAlwaysUsageDescription)
-            {
-                [self.locationManager requestAlwaysAuthorization];
-            }
-            else if (hasWhenInUseUsageDescription)
-            {
-                [self.locationManager requestWhenInUseAuthorization];
-            }
-            else
-            {
-                NSString *suggestedUsageKeys = requiresWhenInUseUsageDescription ?
-                    @"NSLocationWhenInUseUsageDescription and (optionally) NSLocationAlwaysAndWhenInUseUsageDescription" :
-                    @"NSLocationWhenInUseUsageDescription and/or NSLocationAlwaysUsageDescription";
-                [NSException raise:MGLMissingLocationServicesUsageDescriptionException
-                            format:@"This app must have a value for %@ in its Info.plist.", suggestedUsageKeys];
+            if (@available(iOS 11.0, *)) {
+                // A WhenInUse string is required in iOS 11+ and the map never has any need for Always, so it's enough to just ask for WhenInUse.
+                if (hasWhenInUseUsageDescription) {
+                    [self.locationManager requestWhenInUseAuthorization];
+                } else {
+                    [NSException raise:MGLMissingLocationServicesUsageDescriptionException
+                                format:@"To use location services this app must have a NSLocationWhenInUseUsageDescription string in its Info.plist."];
+                }
+            } else {
+                // We might have to ask for Always if the app does not provide a WhenInUse string.
+                BOOL hasAlwaysUsageDescription = !![[NSBundle mainBundle] objectForInfoDictionaryKey:@"NSLocationAlwaysUsageDescription"];
+
+                if (hasWhenInUseUsageDescription) {
+                    [self.locationManager requestWhenInUseAuthorization];
+                } else if (hasAlwaysUsageDescription) {
+                    [self.locationManager requestAlwaysAuthorization];
+                } else {
+                    [NSException raise:MGLMissingLocationServicesUsageDescriptionException
+                                format:@"To use location services this app must have a NSLocationWhenInUseUsageDescription and/or NSLocationAlwaysUsageDescription string in its Info.plist."];
+                }
             }
         }