Locking to Portrait on app launching rotates from Landscape to Portrait (iOS)

I want to lock the orientation of the first screen of app to Portrait. But when I launch the application I see for a while landscape orientation and then quickly rotating to the Portrait orientation. Next screens are okey.

Here is my code:

componentDidMount() {
        Orientation.lockToPortrait()
}

Is it possible to solve this performance issue?

[wonday]

You also can add native code to AppDelegate.m

#import "Orientation.h"

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
  // lock to Portrait
  [Orientation setOrientation:UIInterfaceOrientationMaskPortrait];
  [[UIDevice currentDevice] setValue:[NSNumber numberWithInteger: UIInterfaceOrientationPortrait] forKey:@"orientation"];

...
}

[ALPNP]

The native code solved my problem. This is amazing. I love this library.