iOS: Replace the deprecated getValue call with a simple typecast in request permission method.

permission_handler/ios/Classes/PermissionManager.m

@@ -32,13 +32,19 @@
 }
 }
 
 
 - (void)requestPermissions:(NSArray *)permissions completion:(PermissionRequestCompletion)completion {
 - (void)requestPermissions:(NSArray *)permissions completion:(PermissionRequestCompletion)completion {
-    NSMutableSet *requestQueue = [[NSMutableSet alloc] initWithArray:permissions];
     NSMutableDictionary *permissionStatusResult = [[NSMutableDictionary alloc] init];
     NSMutableDictionary *permissionStatusResult = [[NSMutableDictionary alloc] init];
 
 
+    if (permissions.count == 0) {
+        completion(permissionStatusResult);
+        return;
+    }
+    
+    NSMutableSet *requestQueue = [[NSMutableSet alloc] initWithArray:permissions];
+        
     for (int i = 0; i < permissions.count; ++i) {
     for (int i = 0; i < permissions.count; ++i) {
-        PermissionGroup value;
-        [permissions[i] getValue:&value];
-        PermissionGroup permission = value;
+        NSNumber *rawNumberValue = permissions[i];
+        int rawValue = rawNumberValue.intValue;
+        PermissionGroup permission = (PermissionGroup) rawValue;
         
         
         id <PermissionStrategy> permissionStrategy = [PermissionManager createPermissionStrategy:permission];
         id <PermissionStrategy> permissionStrategy = [PermissionManager createPermissionStrategy:permission];
         [_strategyInstances addObject:permissionStrategy];
         [_strategyInstances addObject:permissionStrategy];