#import <AYNavigationBar/UIViewController+AYNavigationBar.h>

UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:vc];
nav.ay_navigation.configuration.enabled = YES;

UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:vc];
nav.ay_navigation.configuration.titleTextAttributes = @{NSForegroundColorAttributeName: [UIColor blueColor]};
nav.ay_navigation.configuration.barTintColor = [UIColor cyanColor];
nav.ay_navigation.configuration.backgroundImage = [UIImage imageNamed:@"nav"];
nav.ay_navigation.configuration.shadowImage = [UIImage imageNamed:@"shadow"];
nav.ay_navigation.configuration.translucent = NO;
nav.ay_navigation.configuration.barStyle = UIBarStyleBlack;
nav.ay_navigation.configuration.extraHeight = 14;

self.ay_navigation.bar  -> UINavigationBar
self.ay_navigation.item -> UINavigationItem

// remove blur effect
self.ay_navigation.bar.translucent = NO;

// hide bottom black line
self.ay_navigation.bar.shadowImage = [[UIImage alloc] init];
// if version < iOS 11.0, also need:
[self.ay_navigation.bar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];

// if you need to set status bar style lightContent
self.navigationController.navigationBar.barStyle = UIBarStyleBlack;

// if you want change navigation bar position
self.ay_navigation.bar.isUnrestoredWhenViewWillLayoutSubviews = YES;

// enable
if (@available(iOS 11.0, *)) {
   self.navigationController.navigationBar.prefersLargeTitles = YES; // once
}
// show
if (@available(iOS 11.0, *)) {
   self.navigationItem.largeTitleDisplayMode = UINavigationItemLargeTitleDisplayModeAlways;
}
// hide
if (@available(iOS 11.0, *)) {
   self.navigationItem.largeTitleDisplayMode = UINavigationItemLargeTitleDisplayModeNever;
}