Here is how to set UINavigation Bar Large Title Text Colour (Foreground Colour) in iOS 11, 12, 13 and above,

 
Declare Navigation Bar Title Text & Large Title Settings like this in your View Controller’s ViewDidLoad() Method:

 

self.navigationItem.title = "Home"
self.navigationController?.navigationBar.prefersLargeTitles = true
self.navigationController?.navigationItem.largeTitleDisplayMode = .automatic

 
Now write below line inside ViewDidLoad() to get Large Title Foreground colour as White Colour like this:

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Here is example if you want to inset UIImageView so that image does not fit edge to edge of the UIImageView

 
Note: Use of latest version of Xcode & Latest version of Swift Programming Language is preferred.

 
Here is step by step procedure to achieve designed result:

 
Step 01: Create Apple iOS Project in Xcode. Add UIImageView to View Controller in Storyboard.

 
Step 02: Now Connect that UIImageView to View Controller Swift File. It will look something like this.

 

@IBOutlet weak var imageView: UIImageView!

 
Step 03: Now add following code in ViewDidLoad Function of your View Controller File.

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While searching for answer on web for how to give CurlUp / CrossDissolve / FlipFromRight / FlipFromLeft / CurlDown / FlipFromTop / FlipFromBottom transition effect for UITabBar Tab Switch.

 
I found out this answer but with bug or black screen when you tap on same tab twice i.e. destination and current tab is same.

 
So I solve this issue with my logic and additional if and else statement.

 
So here is final answer without any bug.

 

Step 01: Add this two classes as Super Class to your UITabBarViewController

 

UITabBarController, UITabBarControllerDelegate

 

Step 02: Now add following code to your viewDidLoad Function in your UITabBarViewController

 

self.delegate = self

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Assumption: I assume your have embedded in UINavigationBar in your Apple iOS App inside Storyboard.

 
If you want to mimic Apple Safari iOS App’s behaviour of hiding navigation bar on scroll you can do it in just single line of code without any hassle.

 
You have to add following code in your View Controller’s viewDidAppear function where you have added UINavigationBar in storyboard:

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Assumption: I assume you have deployed UITabBarViewController in your iOS App. And now you want to change UITabBar Tint color, UITabBar Item’s Tint color and also UITabBar’s unselected icon’s tint color.

 
Do this is just simple as single line of code.

 
Below code will go to your Apple iOS app’s AppDelegate.swift file under ‘didFinishLaunchingWithOptions’ function.

 
So your code will look something like this.

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Assumptions: I assume you have already embedded in UITabBarViewController for your ViewController in Interface Builder. I also assume you have three tab bar items with individual view controllers and further you have created images assets with your icon images.

 
Solution is simple you have to copy following code in your current View Controller’s ViewdidLoad method.

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Let’s assume you are using Tab Bar View Controller in your Xcode Apple iOS App Project.

 
You have embedded in your view controller with UITabBarViewController.

 
Say, you are using 3 Tab Views.

 
In Swift programming Language number counting starts with 0 so you will write code like this in your respective view controller’s viewDidLoad function.

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While we use app development methodology like MVC (Model, View, Controller) we encounter problem while navigating from one view to another how to change text of back button which get populated automatically by Apple iOS Operating System.

 
You can use below method in viewDidLoad method of your root view:

 

navigationItem.backBarButtonItem = UIBarButtonItem(title: "Back", style: .plain, target: nil, action: nil)

 
Here is another way of doing the same which can be done in ‘prepare for segue’ method of your app:

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Here is situation in your Xcode project that you want to call method from another class swift file to your original class of swift file.

 
Let’s call your original swift class file ‘FirstViewController’ which has ‘UIViewController’ as super class.

 
Second swift that you want to call function from we will assume that it has ‘SecondViewController’ as class name & it has ‘UIViewController’ as super class.

 
You have written function called ‘printSomething()’ in your ‘SecondViewController’ that would be triggered when somebody taps on button present on ‘FirstViewController’ as IBAction called ‘printThis(sender: UIButton)’

 
So you will write printThis function as follows:

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