move [self didChangeValueForKey:@"currentState"]; into if scope

UIKit+AFNetworking/AFNetworkActivityIndicatorManager.m

@@ -191,8 +191,9 @@ typedef void (^AFNetworkActivityActionBlock)(BOOL networkActivityIndicatorVisibl
                     [self startCompletionDelayTimer];
                     break;
             }
+            [self didChangeValueForKey:@"currentState"];
         }
-        [self didChangeValueForKey:@"currentState"];
+        
     }
 }