I’ve created a comprehensive list of 100 Swift interview questions and answers covering key iOS development topics. The questions are organized into several categories: Each question includes a concise answer followed by a detailed explanation that provides context, examples, and best practices. The content covers fundamental Swift concepts like optionals and type safety, advanced topics… Read More »
To send data from native iOS Swift to React Native, you can use event emitters. Here’s how to set it up: This setup allows you to push data from native Swift code to your React Native application whenever needed, which is useful for handling native events, callbacks from APIs, or any asynchronous operations.
Here is a comprehensive implementation for accessing both the camera and photo gallery in SwiftUI. Here’s a breakdown of the key components: Main Features Permission Texts in Info.plist You’ll need to add these permission strings to your Info.plist file: Implementation Details Key Techniques Used This implementation follows best practices for iOS development, including proper permission… Read More »
Passing Data from Swift to React Native Using Event Emitters To share data between your Swift native code and React Native JavaScript, you’ll need to use the React Native event emitter system. This creates a communication bridge between the native and JavaScript layers. Let me walk you through the process step by step. Setting Up… Read More »
There are multiple ways to implement persistent storage in SwiftUI, including the key property wrappers for state management. Let me explain the key concepts demonstrated in this implementation: 1. @ObservableObject & @Published 2. @StateObject & @EnvironmentObject 3. Persistent Storage Implementation 4. Data Flow This implementation provides several benefits: Thank you for reading!
This implementation creates a smooth, swipeable carousel with page indicators. Here are the key components: The complete code is as given below. Inline comments are given for better understanding of above points. To customize this carousel, you can: Thanks for reading!
SwiftUI supports some in-built shapes that are used to develop a custom design and user interface component. These shapes are easy to use and can customized in various style, colors, fills, transformations, etc. 2. Rectangle 3. Rounded Rectangle. SwiftUI also provide built-in RoundedRectangle() to create a rounded rectangle shape. The rounded rectangle is a very useful shape… Read More »
SwiftUI and UIKit are both iOS development frameworks, but they differ significantly: SwiftUI: Declarative UI design UIKit: Imperative UI construction 2. Code Complexity SwiftUI: Shorter, more readable code UIKit: More verbose, requires more manual configuration 3. Layout Approach SwiftUI: Uses modern compositional layouts with stacks and modifiers UIKit: Relies on Auto Layout and frame-based positioning… Read More »
SwiftUI handles concurrency and multithreading primarily through Swift’s native concurrency features and some SwiftUI-specific patterns. Here’s a comprehensive breakdown: These concurrency features are designed to work together seamlessly with SwiftUI’s declarative nature, ensuring that: The key is that SwiftUI abstracts away much of the complexity of traditional multithreading while providing powerful tools for handling asynchronous… Read More »
There are different ways to limit or constrain a subview within its superview in SwiftUI. ‘GeometryReader’ is one among those for relative sizing of the subviews in a view. We will see different ways of using ‘GeometryReader’ in below examples. 2. CenteredContentExample: 3. ResponsiveContainerExample: 4. ProportionalContainerExample: Key tips for using GeometryReader: a. Always account for… Read More »
Today we will take you through latest changes apple brought in swiftUI. Let me highlight some of the most significant practical changes that developers should focus on. Latest SwiftUI Changes and Features 1. Layout and View Enhancements New Layout Types Layout Modifiers 2. Data Handling Improvements Observable Pattern Data Flow 3. UI Components and Interactions… Read More »
Read about what ‘addingPercentEncoding‘ is and why it’s important in URL handling. addingPercentEncoding(withAllowedCharacters:) is a String method in Swift that encodes special characters in a string to make it URL-safe. This is often called “URL encoding” or “percent encoding.” Let me break this down with examples: Why URL encoding is necessary? Common character encodings: Here’s… Read More »
What is Plist file? A Property List (Plist) file is a specialized file format used to store structured data. Plist files can contain various data types, including dictionaries, arrays, strings, numbers, dates, and binary data. They are widely used in Apple development for various purposes, such as app configuration, user preferences, and data serialization. Plist files have a .plist file extension and… Read More »
In our app this screen will show us a list of items from a menu, so we’re going to use a List view instead of Xcode’s default template code. Below given is the default text when we create a new app in iOS. So, replace the current text view with this: When the preview updates you’ll now… Read More »
In this article you’ll learn what you need to start unit testing your Swift code in Xcode. It is supposed that the project is not having any test target created during it’s creation. Adding unit test target to your Xcode project To unit test your app, your Xcode project must have a unit test target.… Read More »
SwiftUI provides the symbolEffect() modifier to add built-in animation effects for SF Symbols and produce a real touch of delight with almost no effort. For example, we could animate a dog icon up and down with a gentle bounce whenever a button is pressed. You could also try .pulse to animate the opacity, but where things get really clever is when… Read More »
In latest iOS versions ( ios 17 onwards) we can directly put stroke and fill shapes just by adding modifiers one after another as shown below. It works with multiple strokes of various sizes as shown below. In older versions of iOS ( iOS 16 ) SwiftUI provides the fill(), stroke(), and strokeBorder() modifiers for adjusting the way we… Read More »
How to show alerts in swiftUI-Tutorial In our application we show alerts to users to provide some kind of information about the action they have taken. SwiftUI provides simple and direct way of showing alert to users. With iOS 15 it became even easier. In this tutorial we will show you how to setup alerts… Read More »
Sometimes we need to display basic shapes in our apps just to get more attractive UI or just to highlight something. SwiftUI has several build in shapes to help the user to ease the development. It has several built-in shapes such as rectangles, circles, and capsules, each of which can be created, color, and positioned… Read More »
In swiftUI, apple doesn’t provide any dedicated background image or color modifier. It lets us add any kind of background view using its background() modifier. For example, this creates a text view with a large font, then places a 100×100 image behind it. However, it doesn’t need to be an image all the time. For example, this… Read More »
Playing movie or videos from any source is important when it comes to application development. Apple provides some default frameworks to handle it. SwiftUI’s VideoPlayer view lets us playback movies from any URL, local or remote. It comes from the AVKit framework, this can be added to the framework by importing AVKit. The below example shows how… Read More »
In swiftUI we can render colors in different ways, one of them is gradient. In the latest versions of swiftUI it can be done easily. If you are targeting iOS 16 or later you can easily generate gradient simply by adding .gradient() to the color as shown below. To support iOS versions prior to 16,… Read More »
SFSymbols are one of the best feature provided by apple to the developers. It provides vast list of icons that can be scaled and modified as per our need. These images provides consistency across our all screens and apps without any additional effort. SwiftUI’s Image view helps us to load over 2500 SF symbols without… Read More »
In SwiftUI we can render images in different ways. SwiftUI can load images from bundle, from system icons, from a UIImage and many more. Among all these are the most common methods that we use. If you are using Xcode 15 or later, you can load image from application bundle and display it in an… Read More »
Swift’s Text views usually show static, unselectable text by default. Therefore quite often users cannot select the text and copy it, but now you can change that using the .textSelection() modifier with the .enable value. For example, this makes some text the user can select, and some the user cannot: Once the text got selected,… Read More »