A weekly Swift Blog on Xcode and iOS Development

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Recent Posts

Markdown rendering using Text in SwiftUI

SwiftUI comes with built-in markdown support for text, making it easy to transform the text into bold, italic, and other ...
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/ SwiftUI

RocketSim 8.0: 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

Memory leaks prevention using an autoreleasepool in unit tests

Memory leaks often happen without notice. Although best practices like using a weak reference to self inside closures help a ...
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/ Swift

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 @dynamicMemberLookup enum @escaping fileprivate for @globalActor guard infix isolated lazy @MainActor nonisolated optional postfix @propertyWrapper private protocol required @resultBuilder rethrows sendable struct subscript throw throws try typealias @unchecked @unknown unowned weak where while

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Learn more about Swift

Memory leaks prevention using an autoreleasepool in unit tests

Memory leaks often happen without notice. Although best practices like using a weak reference to self inside closures help a ...
/ Swift

AsyncSequence explained with Code Examples

AsyncSequence is part of the concurrency framework and the SE-298 proposal. Its name implies it's a type providing asynchronous, sequential, ...
/ ConcurrencySwift

AsyncThrowingStream and AsyncStream explained with code examples

AsyncThrowingStream and AsyncStream are part of the concurrency framework introduced in Swift 5.5 due to SE-314. Async streams allow you ...
/ ConcurrencySwift

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Learn SwiftUI

Markdown rendering using Text in SwiftUI

SwiftUI comes with built-in markdown support for text, making it easy to transform the text into bold, italic, and other ...
/ SwiftUI

Downloading and Caching images in SwiftUI

Downloading and caching images is an essential part of building apps in Swift. There are several ways of downloading images ...
/ SwiftUI

Disable animations on a specific view in SwiftUI using transactions

Animations in SwiftUI look great and make your app shine, but sometimes you want to disable animations on a specific ...
/ SwiftUI

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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 8.0: 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

Thread Sanitizer explained: Data Races in Swift

The Thread Sanitizer, also known as TSan, is an LLVM based tool to audit threading issues in your Swift and ...
/ SwiftXcode

Development Assets in Xcode to enrich SwiftUI Previews

Development Assets in Xcode allow you to provide test data to use within SwiftUI previews and other code during development ...
/ Xcode

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Get better at debugging

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

OSLog and Unified logging as recommended by Apple

OSLog as a replacement of print and NSLog is the recommended way of logging by Apple. It's a bit harder ...
/ DebuggingWorkflow

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Improve your workflow

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

OSLog and Unified logging as recommended by Apple

OSLog as a replacement of print and NSLog is the recommended way of logging by Apple. It's a bit harder ...
/ DebuggingWorkflow

Full-screen development with Xcode and the Simulator

While developing apps it's important to create focus to get in your flow and speed up development. Full-screen mode can ...
/ Workflow

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Optimize yourself and improve

Writing Swift Articles: Tips to become a better writer

Writing Swift articles is a great way to become a better engineer and is often seen as a required skill ...
/ Optimization

Non-fatal errors vs fatal crashes: The differences explained

Non-fatal errors happen in every application that's developed and have a close relationship with fatal errors. Most of us know ...
/ Optimization

Increasing development effectiveness by recognizing repetition

Development effectiveness determines how fast and efficient you can work as an engineer. The more efficient you can make your ...
/ Optimization