Like other data types such as String, Double, Float, Boolean, Array, Dictionary, Struct, and Class, Closure is used broadly in Swift. Closure can store references to any constants and variables. In this short Swift code example, you will learn how to declare a simple Closure in Swift. Declare a Closure Call Closure Syntax Following is a generic…
Read More Declare a Closure in SwiftThe Swift code example below demonstrates a couple of ways how to check if an Array of elements is empty. To be a little more specific this code will demonstrate how to: Create an array with 5 elements, Remove all elements from Array, Check if Array is empty, Check if the number of elements in…
Read More Check if Array is Empty in SwiftWith this Swift code example, I would like to share with you how to sort an array of custom objects in Ascending and Descending order. Create a custom Swift class with the name “Friend”, Create an Array that can hold custom objects of type Friend, Sort Array of custom objects in Ascending and Descending order,…
Read More Sort Array of Custom Objects in SwiftThere are a few different ways of how to create an Array with default values in Swift. Below are a few Swift code examples of creating an Array. Each example creates an array with some initial values. Create an Array of Strings var appleProgrammingLanguages: [String] = [“Swift”, “Objective-C”] Thanks to Swift’s type inference, you don’t…
Read More Create an Array with Default Values in SwiftIn this tutorial, you will learn how to determine the current device model in Swift. To determine the current device model in Swift, you can use the utsname struct provided by the Darwin framework, which contains information about the system. This method involves getting the machine hardware description and then mapping it to the corresponding device…
Read More Determine Current Device Model in SwiftWith this Swift code example, I am going to share with you how to set the current window’s root view controller to a different one. The effect is as if you are replacing the current view controller with a new one. The new view controller will not be pushed into the navigation stack and it…
Read More Set Window’s Root View Controller in SwiftTo present a ViewController in a NavigationController you can wrap ViewController into a NavigationController as it is in the example below. Then present NavigationController which contains ViewController. // Register Nib let newViewController = CustomSignupViewController(nibName: “CustomSignupViewController”, bundle: nil) let navigationController = UINavigationController(rootViewController: newViewController) // Present View “Modally” self.present(navigationController, animated: true, completion: nil)
Read More Present ViewController in NavigationControllerSwift provides powerful tools for comparing and equating custom objects using the Comparable and Equatable protocols. In this tutorial, we will explore how to use the Comparable protocol to compare custom objects based on their properties, and the Equatable protocol to determine whether two objects are equal. By the end of this tutorial, you will…
Read More Comparable Protocol: How to Compare Custom ObjectsIn this tutorial, you will learn how to implement the Singleton design pattern in Swift. Introduction to Singleton Design Pattern The Singleton design pattern guarantees that only one object of a class will exist in a system. This is done in Swift by creating a class with a private initializer. The private initializer ensures that…
Read More Singleton Class in SwiftIn this tutorial, you will learn how to create a new class in Swift. After learning the basics of creating classes in Swift, you can dive deeper and learn how to implement a Singleton pattern in Swift, and create a class that has only one instance throughout your project. Alright, so let’s begin by declaring…
Read More Create a New Class in SwiftThere are different ways to test that the UIViewController has been successfully pushed onto the navigation stack and in this tutorial, I will cover a few of them. For this tutorial, I have created a simple project with two view controllers on the Main.storyboard. The very first view controller has a button. When the button…
Read More Test View Controller Push to Navigation ControllerIn this tutorial, I am going to share with you how to Unit Test some of the UITextField attributes in Swift. Learning how to Unit Test text field attributes covered in this blog post, should give you a good understanding of how to Uni Test other UITextField attributes. This blog post also contains video lessons.…
Read More Unit Testing Text Fields in SwiftThere are a few different ways to Unit test code that throws an Error in Swift and my preferred way is to use the XCTAssertThrowError and XCTAssertNoThrows. I will also share with you how to use the traditional way of handling an error with the do-try-catch. Error To Be Thrown Let’s assume that we have…
Read More Unit Testing Code That Throws Error in SwiftIn this tutorial, you will learn about different ways of accessing UI elements when writing UI Tests in Xcode. Let’s assume we have this view with a Signup form details on it. This view has 5 UITextFields and a single button. UIElement Groups Below is a list of UI elements groups that you can use…
Read More Accessing UI Elements in Xcode UI TestThere are different ways to load UIViewController in a Unit Test and in this tutorial you will learn three of them. Loading UIViewController from Main.storyboard, Loading UIViewController from XIB, Loading UIViewController that is not on the Main.storyboard and does have an interface XIB file. This is a type of UIViewController that creates views programmatically. Loading…
Read More Ways to Load UIViewController in a Unit Test