A weekly Swift Blog on Xcode and iOS Development

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Recent Posts

Creating an App Update Notifier using Combine and async/await

An app update-notifier promotes a new app update to your users. Using a notifier will get better adoption rates with ...
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  •  7 min read / Swift

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 ...
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  •  5 min read / Optimization

Composition vs. Inheritance: code architecture solutions explained in Swift

Composition and inheritance are both fundamental programming techniques when working in object-oriented programming languages. You've likely been using both patterns ...
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  •  4 min read / 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 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

Creating an App Update Notifier using Combine and async/await

An app update-notifier promotes a new app update to your users. Using a notifier will get better adoption rates with ...
  •  7 min read / Swift

Composition vs. Inheritance: code architecture solutions explained in Swift

Composition and inheritance are both fundamental programming techniques when working in object-oriented programming languages. You've likely been using both patterns ...
  •  4 min read / Swift

Property Wrappers in Swift explained with code examples

Property Wrappers in Swift allow you to extract common logic in a distinct wrapper object. This new technique appeared at ...
  •  10 min read / Swift

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Learn SwiftUI

How to create a Conditional View Modifier in SwiftUI

Conditional View Modifier creation in SwiftUI allows you only to apply modifiers if a certain condition is true. Whether it's ...
  •  4 min read / SwiftUI

How to create a Dynamic Pager View for onboardings

A pager view in SwiftUI like we know UIPageViewController in UIKit didn't exist until iOS 14 and macOS 11.0. Using ...
  •  6 min read / SwiftUI

Getting started with UIKit in SwiftUI and vice versa

SwiftUI can work together with UIKit by making it easier to add SwiftUI views to UIKit and visa versa using ...
  •  6 min read / SwiftUI

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Combine all the things

PassthroughSubject vs. CurrentValueSubject explained

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

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 ...
  •  3 min read / CombineCore Data

Getting started with the Combine framework in Swift

Combine was introduced as a new framework by Apple at WWDC 2019. The framework provides a declarative Swift API for ...
  •  9 min read / CombineSwift

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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 ...
  •  3 min read / 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 ...
  •  3 min read / 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 ...
  •  3 min read / Core Data

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Be an expert on 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 ...
  •  5 min read / 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 ...
  •  4 min read / Xcode

Xcode Mark Line to improve readability using // Mark: comments

Xcode Mark Lines allows us to create a better overview of sections within our classes or structs. A so-called mark ...
  •  4 min read / Xcode

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Get better at debugging

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 ...
  •  5 min read / 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 ...
  •  6 min read / DebuggingWorkflow

Using Custom debug descriptions to improve debugging

Custom debug descriptions can help you debug your own custom objects, structs, errors, and other types. Whenever you print out ...
  •  5 min read / DebuggingSwift

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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 ...
  •  6 min read / Workflow

RocketSim 4.0: Compare designs & record the Simulator with Touches

RocketSim 4.0 is available as of today and comes with a few major new features. Designs from Sketch and Figma ...
  •  2 min read / 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 ...
  •  6 min read / DebuggingWorkflow

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Optimize yourself and improve

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 ...
  •  5 min read / 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 ...
  •  6 min read / Optimization

Presentation tips for performing professional Swift talks

Presentation tips can help you perform professional Swift talks by making sure you're well prepared and professional-looking. Last week, I ...
  •  7 min read / Optimization
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Most Popular Posts

  1. Creating an App Update Notifier using Combine and async/await
  2. Expressible literals in Swift explained by 3 useful examples
  3. Async await in Swift explained with code examples
  4. Non-fatal errors vs fatal crashes: The differences explained
  5. Lazy var in Swift explained with code examples

 

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