Recent Posts
Swift 6: What’s New and How to Migrate
Apple announced Swift 6 during WWDC 2024 as a major release of their programming language. It became first available in ...
How to develop an app for iOS
You have a great app idea but you wonder: how to develop an app for iOS? Where do I even ...
Parameterized tests in Swift: Reducing boilerplate code
Parameterized tests allow you to run a single test with multiple input parameters without adding much boilerplate code. For example, ...
Master Mobile Monitoring SwiftUI AppsMonitor your app’s health with real-time insights into crash-free rates, start times, and more. Optimize performance and prevent user churn by addressing critical issues like app hangs, and ANRs. Learn how to keep your iOS app running smoothly across all devices by downloading this eBook.
Swift Keywords
Do you know how to use each keyword in Swift?
Click on the keyword to learn more and explore code examples.
Career Advice – Grow your career
Looking to grow your career in iOS development? With years of experience leading teams at WeTransfer and building SwiftLee into a go-to resource for over 140,000 developers monthly, I offer insights on everything from launching successful side projects to scaling app users. Whether you’re refining your Swift skills, building an online presence, or creating passive income with courses, I’m here to help you navigate your journey.
Ready to make your side project a success?
Tired of the 9-to-5 grind and endless meetings? Imagine turning your side project into a six-figure income and going fully independent—just like I did. Learn my proven steps to transform your passion into profit.
The Going Indie Podcast
Discover stories and strategies from creators who’ve turned side projects into thriving businesses. Ready to take the leap?
Learn more about Swift
iOS App Development: How to get started?
Learning about iOS app development and related software allows you to create an app for iPhones, iPads, Apple Watch, or ...
Swift Tutorials: Learn Swift with Easy-to-Follow Code Examples
Swift tutorials help you to get started building apps for Apple's platforms. The best way to learn Swift is by ...
SF Symbol: How to for Swift & SwiftUI
Apple introduced SF Symbols during WWDC 2019 as a big present for developers, as they're straightforward and free to use ...
Learn SwiftUI
How to develop an app for iOS
You have a great app idea but you wonder: how to develop an app for iOS? Where do I even ...
SwiftUI Lists: Present rows of data explained with code examples
SwiftUI Lists allow you, as a developer, to present rows of data. It's one of the most commonly used elements ...
SwiftUI Button: Custom Styles, Variants, and Best Practices
SwiftUI allows you to create buttons in different styles, both custom and default configurations. You can define reusable button styles ...
Build Apps Faster using RocketSim
Recommend by Apple as an “Essential Tool for Developers”, RocketSim helps thousands of engineers to save hours per week. Discover these articles and learn how you can leverage RocketSim to improve your workflow:
App Actions
- Inspect network traffic using the Xcode Simulator
- Universal Links implementation on iOS
- Deeplink URL handling in SwiftUI
- Location Simulation in Xcode’s Simulator
- Optimizing your app for Network Reachability
- Testing push notifications on the iOS simulator
App Actions Perform Menu
- Localization testing in Xcode
- User Defaults reading and writing in Swift
- Xcode Simulator Directories Exploration
RocketSim Tools
Combine all the things
@Published risks and usage explained with code examples
@Published is one of the property wrappers in SwiftUI that allows us to trigger a view redraw whenever changes occur ...
RunLoop.main vs DispatchQueue.main: The differences explained
RunLoop.main and DispatchQueue.main are often used as schedulers within Combine. During code reviews, I often encounter inconsistency in using one ...
PassthroughSubject vs. CurrentValueSubject explained
PassthroughSubject and CurrentValueSubject are two types from the Combine framework that conforms to the Subject protocol. Both are very similar ...
Master Mobile Monitoring SwiftUI AppsMonitor your app’s health with real-time insights into crash-free rates, start times, and more. Optimize performance and prevent user churn by addressing critical issues like app hangs, and ANRs. Learn how to keep your iOS app running smoothly across all devices by downloading this eBook.
Dive into Core Data
How to observe NSManagedObject changes in Core Data using Combine
Observing changes in Core Data NSManagedObject instances with Combine publishers can be a great solution to keep your user interface ...
Data validation on insertion, update, and deletion in Core Data
Data validation in apps is important to make sure we save data conforming to the business rules. A name should ...
Derived Attributes to improve Core Data Fetch Performance
Derived attributes are available since iOS 13 and aim to improve fetch performance in many different scenarios. Although we have ...
Be an expert on Xcode
RocketSim 13.0: Builds Apps Faster
RocketSim is a developer tool that gives your Xcode Simulator extra functionalities to increase day-to-day development productivity. A floating window ...
Inspect network traffic using the Xcode Simulator
Inspecting network traffic is an essential skill for app developers. Several tools allow you to monitor requests going in and ...
Xcode Build Insights: Keep track of project compilation times
Xcode Build Insights lets you keep track of compilation times to ensure your project doesn't suddenly become slow to build ...
Get better at debugging
Network Link Conditioner: Simulating Slow Networking
The Network Link Conditioner allows you to test your apps under slow networking conditions on macOS and iOS. The tool ...
Memory consumption when loading UIImage from disk
Memory consumption can quickly increase if you load many images from the disk using UIImage. You'll generally load images from ...
Debugging SwiftUI views: what caused that change?
Debugging SwiftUI views is an essential skill when writing dynamic views with several redrawing triggers. Property wrappers like @State and ...
Improve your workflow
Designing Apps: 5 Methods to improve your workflow
Designing apps can be challenging if you don't have a design background. Many of you who read my blog are ...
Test-Driven Development (TDD) for bug fixes in Swift
Test-driven development (TDD) is a technique that requires you first to write a failing test before you start implementing a ...
Third-party libraries acknowledgments using a Settings bundle
Third-party libraries help developers build apps faster but often come with a license. The MIT license is likely the most ...
Optimize yourself and improve
Network Link Conditioner: Simulating Slow Networking
The Network Link Conditioner allows you to test your apps under slow networking conditions on macOS and iOS. The tool ...
Contingent pricing for in-app subscriptions
Contingent pricing for in-app subscriptions creates a new way to retain and attract customers by providing discounted subscription prices to ...
App onboarding funnel optimization to increase conversions
An app onboarding can be seen as a funnel full of steps toward the key action of your application. A ...
Explore categories
Swift
Combine
Concurrency
SwiftUI
Core Data
Xcode
Debugging
Workflow
Optimization
Swift Charts
Swift Testing
Most Popular Posts
- How to develop an app for iOS
- Async await in Swift explained with code examples
- Sendable and @Sendable closures explained with code examples
- MainActor usage in Swift explained to dispatch to the main thread
- Swift 6: What’s New and How to Migrate