iPhone X Tab Bar and Nav Bar Issue - uitabbarcontroller

Question

I have this complete app build programmatically right from beginning. The project was started on an old Xcode may be Xcode 6. I am currently building on Xcode 6. My Project has Objective-C and Swift files communicating with each other. The problem I am having is because it is built programmatically, I cannot just go into the storyboard and set use safe areas layout.
My Tab Bar Images on Xcode 9.2 are going crazy and also the nav bar. I want to fix the images as well as height of the tab bar.
Here is the code in AppDelegate for adding tabbarcontroller.
- (void)setupView {
UIViewController *firstViewController = [[UIViewController alloc]init];
firstViewController.view.backgroundColor = UIColor.redColor;
firstViewController.title = #"First View";
firstViewController.tabBarItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemSearch tag:0];
UINavigationController *firstNavController = [[UINavigationController alloc] initWithRootViewController:firstViewController];
UIViewController *secondViewController = [[UIViewController alloc]init];
secondViewController.view.backgroundColor = UIColor.blueColor;
secondViewController.title = #"Second View";
secondViewController.tabBarItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemFavorites tag:1];
UINavigationController *secondNavController = [[UINavigationController alloc] initWithRootViewController:secondViewController];
UIViewController *thirdViewController = [[UIViewController alloc]init];
thirdViewController.view.backgroundColor = UIColor.purpleColor;
thirdViewController.title = #"Third View";
thirdViewController.tabBarItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemRecents tag:2];
UINavigationController *thirdNavController = [[UINavigationController alloc]initWithRootViewController:thirdViewController];
UIViewController *fourthViewController = [[UIViewController alloc]init];
fourthViewController.view.backgroundColor = UIColor.greenColor;
fourthViewController.title = #"Fourth View";
fourthViewController.tabBarItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemHistory tag:2];
UINavigationController *fourthNavController = [[UINavigationController alloc]initWithRootViewController:fourthViewController];
tabBarController = [[UITabBarController alloc] initWithNibName:nil bundle:nil];
[tabBarController.tabBar invalidateIntrinsicContentSize];
tabBarController.viewControllers = [[NSArray alloc] initWithObjects:firstNavController, secondNavController, thirdNavController, fourthNavController, nil];
tabBarController.delegate = self;
[tabBarController.view setNeedsLayout];
self.window.rootViewController = tabBarController;
[self.window makeKeyAndVisible];
}
I have added the iPhone X Splash screen which made the complete app to go
I have researched enough but not able to find a solution.

Answer 1

You apparently missed this line [[tabBarController view] setAutoresizingMask:UIViewAutoresizingFlexibleHeight];
tabBarController = [[UITabBarController alloc] initWithNibName:nil bundle:nil];
[tabBarController.tabBar invalidateIntrinsicContentSize];
tabBarController.viewControllers = [[NSArray alloc] initWithObjects:firstNavController, secondNavController, thirdNavController, fourthNavController, nil];
/* Enter this line */
[[tabBarController view] setAutoresizingMask:UIViewAutoresizingFlexibleHeight];
tabBarController.delegate = self;
[tabBarController.view setNeedsLayout];
I tried with your code and got the result:
Here is a screenshot: