Give your simulator superpowers

Give your Xcode
Simulator extra features

A weekly Swift Blog on Xcode and iOS Development

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Recent Posts

Testing push notifications on the iOS simulator

Testing push notifications in the iOS simulator make adding support for remote notifications much more effortless. You often must iterate ...
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/ Workflow

Task Groups in Swift explained with code examples

Task Groups in Swift allow you to combine multiple parallel tasks and wait for the result to return when all ...
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/ ConcurrencySwift

RocketSim 9.0: Enhance your iOS Simulator

RocketSim is a developer tool that gives your iOS Simulator extra functionalities to increase day-to-day development productivity. Floating windows become ...
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/ Xcode

Swift Keywords

Do you know how to use each keyword in Swift?
Click on the keyword to learn more and explore code examples.

actor associatedtype async @autoclosure available await break catch class continue defer @discardableResult @dynamicCallable @dynamicMemberLookup enum @escaping fileprivate for @globalActor guard infix isolated lazy @MainActor nonisolated optional postfix @propertyWrapper private protocol required @resultBuilder rethrows sendable some struct subscript throw throws try typealias @unchecked @unknown unowned weak where while

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Learn more about Swift

Task Groups in Swift explained with code examples

Task Groups in Swift allow you to combine multiple parallel tasks and wait for the result to return when all ...
/ ConcurrencySwift

Enum explained in-depth with code examples in Swift

Enum usage in Swift: If case, guard case, fallthrough, and the CaseIteratable protocol. These are all terms which could sound ...
/ Swift

OptionSet in Swift explained with code examples

OptionSet in Swift allows you to define a set of options for configurations. It's the Swift variant of the well-known ...
/ Swift

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Learn SwiftUI

How to use FormatStyle to restrict TextField input in SwiftUI

A custom FormatStyle can help you control the allowed characters of a SwiftUI TextField. You might want to allow numbers ...
/ SwiftUI

Sheets in SwiftUI explained with code examples

Sheets in SwiftUI allow you to present views that partly cover the underlying screen. You can present them using view ...
/ SwiftUI

Alternate App Icon Configuration in Xcode

Adding alternate app icons to your app allows users to customize their home screen with an app icon that fits ...
/ SwiftSwiftUI

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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 ...
/ CombineSwiftUI

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 ...
/ Combine

PassthroughSubject vs. CurrentValueSubject explained

PassthroughSubject and CurrentValueSubject are two types from the Combine framework that conforms to the Subject protocol. Both are very similar ...
/ Combine

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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 ...
/ CombineCore Data

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 ...
/ Core Data

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 ...
/ Core Data

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Be an expert on Xcode

RocketSim 9.0: Enhance your iOS Simulator

RocketSim is a developer tool that gives your iOS Simulator extra functionalities to increase day-to-day development productivity. Floating windows become ...
/ Xcode

Getting started with Unit Tests in Swift

Unit tests in programming languages ensure that written code works as expected. Given a particular input, you expect the code ...
/ SwiftXcode

Faster StoreKit testing by syncing in-app purchase products

StoreKit testing in the Simulator allows you to speed up testing in-app purchases for your app. You can test in-app ...
/ Xcode

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Get better at debugging

Deadlocks in Swift explained: detecting and solving

Deadlocks in Swift can make your app hang, causing a frustrating situation for both you and your users. Your app ...
/ DebuggingSwift

Debugging SwiftUI views: what caused that change?

Debugging SwiftUI views is an essential skill to own when writing dynamic views with several redrawing triggers. Property wrappers like ...
/ DebuggingSwiftUI

Flaky tests resolving using Test Repetitions in Xcode

Flaky tests can be frustrating to deal with. You're ready to open your PR until you realize your tests fail ...
/ Debugging

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Improve your workflow

Testing push notifications on the iOS simulator

Testing push notifications in the iOS simulator make adding support for remote notifications much more effortless. You often must iterate ...
/ Workflow

Side Projects: 10 Tips for being successful

It's common to have a side project as an engineer since we can build our ideas. At the same time, ...
/ OptimizationWorkflow

Picking your minimum iOS version to support

When a new iOS version arrives, it's oftentimes a moment to reflect on the supported iOS versions and see to ...
/ Workflow

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Optimize yourself and improve

Engineering goals: How to become a more successful developer

Engineering goals create focus and help you achieve the milestones of becoming a successful developer. You'll know better what you've ...
/ Optimization

Binary Targets in Swift Package Manager

Binary Targets in Swift Package Manager (SPM) allow packages to declare xcframework bundles as available targets. The technique is often ...
/ OptimizationSwift

Refactoring Swift: Best Practices to succeed

Refactoring code is part of the journey toward building sustainable apps. Whether you're experienced or not: every developer refactors their ...
/ Optimization