How to hide status bar automatically after load view

You want UIApplication's setStatusBarHidden:withAnimation:

[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationSlide];

See the docs.

Haven't tested it and there might be a better way but if you put the following in your load view function:

[self performSelector:@selector(hideNavBar) withObject:nil afterDelay:0.0];

and then have this function

-(void) hideNavBar {
    if (self.navigationController.navigationBar.hidden == NO)
    {
        [self.navigationController setNavigationBarHidden:YES animated:YES];
    }
}

You might have to hide the navigation bar in a view animation block. but some combination should work

Check out link

You could simply do it in you AppDelegate, when applicationDidBecommeActive ("After loaded view"). Set hide status after 400ms, with UIView animation block and calculate your root view controller's navigation bar

// AppDelegate.m

#import "AppDelegate.h"
#import "SomeViewController.h"

@interface AppDelegate ()
@property (nonatomic, strong) SomeViewController *someViewController;
@end

@implementation AppDelegate

- (void)applicationDidBecomeActive:(UIApplication *)application
{
    UINavigationBar *navBar = self.someViewController.navigationController.navigationBar;
    if (![[UIApplication sharedApplication] isStatusBarHidden]) {
       [[UIApplication sharedApplication] setStatusBarHidden:YES
                                               withAnimation:UIStatusBarAnimationSlide];
       [UIView animateWithDuration:0.4
                        animations:^{
                            navBar.frame = CGRectMake(navBar.frame.origin.x, 0, navBar.frame.size.width, navBar.frame.size.height);
                     } completion:nil];
    }
}

@end

that's it, "After loaded view (didBecomeActive), the status bar will show and it will automatically hide after a while (400ms)"

You have to select your project and select Hide during application launch inside the header General, section Deployment Info like this:

And inside the info.plist set the View controller-based status bar to NO: