Protocol Oriented Programming (POP) is a programming paradigm that emphasizes the use of protocols to define interfaces between components in a software system. It is a popular approach used by Swift developers to build flexible, modular, and reusable code. In…
Object-oriented programming, or OOP, is a popular programming paradigm that is widely used in iOS development. As an iOS developer, understanding and utilizing the principles of object-oriented programming (OOP) is crucial to building robust and maintainable applications. Whether it’s through…
With SwiftUI, displaying maps in your app is made easy through the use of the Map view. It allows for seamless integration of maps within the rest of your app’s views and gives you control over various aspects such as…
To create a floating button in SwiftUI, you can use a Button with a custom background and a fixed position within a ZStack. Here is an example of how you might do this: This creates a circular button with a…
As a beginner iOS engineer, there are several key areas you should focus on learning: Overall, as a beginner iOS engineer, it is important to focus on learning the Swift programming language, the iOS frameworks and APIs, the Xcode development…
To draw paths and custom shapes in SwiftUI, you can use the Path and Shape types provided by the SwiftUI framework. The Path type represents a geometric path in two-dimensional space, and it consists of a sequence of straight and…
Part 3 consists Swift iOS interview questions and answers of thread and concurrency. It will cover concurrency-related topics such as GCD, NSOperation, operation queue, lock, semaphore etc. Threading and concurrency are important concepts in software development and are especially relevant…
Memory management is one of the important concept when it comes to mobile application development. Memory leaks and app crashes are very common due to poorly managed memory in iOS apps. In this short article, I will describe ARC and…
Part 2 consists Swift iOS interview questions and answers of UI – Auto layout & UIKit. It will cover UI related topics such as frame, bound, autolayout constraints, xib, storyborad, safe area etc. What is bounding box? The bounding box…
Access control is very powerful concept in object oriented programming language. Access control helps prevent you from using objects in ways they were not intended to be used. Access control lets you carefully control what properties and methods an entity…
If you want to detect multiple gestures at the same time, you can use SwiftUI’s simultaneously function. You can simply say that it is opposite of sequenced gestures described in How to implement sequential gestures using sequenced? For example, this…
If you want to collaborate multiple gestures and make them detectable one after another, you can use SwiftUI’s sequenced modifier. To implement combined gestures or sequential gestures you need to create multiple gestures. In this case, the second gesture can…
SwiftUI provides gesture modifier to implement tap gesture on a view. Multiple gesture can be achieved though adding count numbers. To try it out let’s create a view and add a tap gesture recogniser To detect multiple taps, we need…
To pop or dismiss the view programmatically in SwiftUI, you can use use @Environment(\.presentationMode) as a variable and call wrappedValue.dismiss(). In the DetailView we have called wrappedValue.dismiss() wen the button is tapped. You can also get the same outcome if…
You can use NavigationLink in the List modifier to show the detail view or a new view when user taps on the list item. For example, we could create a simple DetailView which will be shown when list item is…
NavigationLink helps you to present new view or detail view from the navigation view. While using NavigationLink it pushes the a details view on the navigation stack with built in animation. To demonstrate this, the following code creates a DetailView…
SwiftUI date picker is a very handy built-in modifier(DatePicker) for selecting a specific date, time, or both. A date picker has four modes: date, time, date and time, count down timer. You can display date picker in contact, wheels and…
SwiftUI’s dedicated picker can display one or more scrollable items from which you can choose your desired item. It is recommended to use pull-down menu instead of a picker if the list is not very long. A picker typically appears…
SwiftUI menu is a versatile control for presenting a menu of actions. It supports submenus and the primary action from iOS 15. SwiftUI menu is more user friendly and advance than the action sheet. Let’s try a menu named “Manage…
The context menu provides you access to additional functionality related to onscreen items without cluttering the screen. You can create a context menu using .contextMenu modifier. The context menu is triggered with a long press. Each menu item in the…
From iOS 15 you can present an action sheet using confirmationDialog() modifier. In SwiftUI, the action sheet shows a confirmation dialogue using data to produce the dialogue’s content and a localized string key for the title. You need to provide…
Glassmorphism is a very trending UI design paradigm nowadays. We can use the semi-transparent blurry background to give more focus on the foreground content. SwiftUI provides .blur() modifier to create the background blur but it has very limited functionality compared…
ScrollView in SwiftUI presents its content within the scrollable region. ScrollView can scroll horizontally, vertically, or both. The alignment of the ScrollView is vertical. If you want to make it horizontal then you need to use the horizontal parameter for…
If you want to place a view on top of another view(s), you need to use ZStack. The ZStack places each child view a higher z-axis value than the one before it. It simply means that later children are presented…
Shapes in SwiftUI are a very innovative, exceptionally simple way to build a user interface component. In this article, we will take a look at simple shapes like rectangle, rounded rectangle, ellipse, circle and capsule. The common use of built-in…
iOS 15 makes the alert presentation a piece of cake. You can show an alert using the alert() modifier. Buttons inside the alert will dismiss the alert view when it is tapped. You can create multiple buttons inside an alert.…
#file, #line and #function are very common to debug features that are available in other languages like C++. I found it very useful to implement debug/logging manager. We can get the current file name, line number and function name from…
Custom view modifier is very powerful concept in SwiftUI which will allow you to write reusable code. If you are using same kind of modifiers throughout multiple of views, it is better to create a custom view modifier. The main…
Given-When-Then (GWT) is a structured way to write unit tests. I find it is particularly useful when I need to write complex unit tests. The structure helps me to write and understand unit test faster than the traditional approach. Using this…
The associated type in Swift gives a placeholder name to a type that will be used as part of the protocol. When the protocol is conformed, the actual type to use for that it is specified. The associated type makes the protocol generic by…
The understanding of the mutating function depends on the understanding of reference and value types. In Swift, The properties of value types cannot be changed within its instance methods by default. You need to use a mutating keyword in the…
Using defer keyword in Swift code is uncommon. But, It is a very powerful concept for certain use case. The code block inside defer statement is executed just before transferring program control. It does not matter how program control is…
DispatchGroup allows you to add a set of tasks and schedule them for asynchronous execution. This behaviour can be helpful when progress can’t be made until all of the specified tasks are complete. For instance, If you have several long-running…
In Swift, If you conform to a protocol you need to implement all its methods or properties. Optional methods are not allowed when implementing protocols. For instance: We can try some tricks to make the optional methods. Use default implementation…
The typealias is a simple but powerful concept in Swift. Type alias does not create new types. They simply provide a new name to an existing type. It makes long, compound types easy to manage. In Swift, we are passing…
First-class functions are the core feature of a functional programming language. Swift isn’t a functional programming language. But, it has the power of first-class functions. In this short article let’s have a look at the first-class functions and their application.…
Higher-order functions are used a lot in functional programming. A higher-order function is a function that takes one or more functions as arguments and returns a function or a value as its result. All other functions are first-order functions. Higher-order…
The Final is a class modifier that prevents it from being inherited or being overridden. While writing an API developer might have a class in the framework that can be abused or misused when subclassed. The solution will be the…
A variadic parameter accepts zero or more values of a specified type. When creating API it seems more developer-friendly as we don’t needs to generate an array at the caller site in order to pass multiple arguments. The variadic parameter using three…
I prefer to use computed properties when I need to compose new data from existing data sources or I want to reduce a complicated, nested property name to a more readable and easy to use one (but update it when…
