Donny Wals

I’m a curious, passionate iOS Developer from the Netherlands who loves learning, sharing knowledge and programming.

Amsterdam, The Netherlands Joined on Nov 8, 2019 https://www.donnywals.com

Work

Independent iOS Engineer and Author

Pinned

Donny Wals

Nov 8 '19

When to use weak self and why

#ios #swift

8 min read

Donny Wals

Dec 23 '21

Forcing an app out of memory on iOS

#ios #tutorial #productivity

2 min read

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Donny Wals

Sep 7 '21

Using Swift's async/await to build an image loader

#swift #async #concurrency #swiftui

9 min read

Donny Wals

Aug 24 '21

What exactly is a Combine AnyCancellable?

#swift #combine #frp

6 min read

Donny Wals

Aug 24 '21

What does “atomic” mean in programming?

#swift #atomic #programming #theory

2 min read

Donny Wals

Jun 3 '21

The iOS Developer's guide to WWDC 2021

#wwdc2021 #ios #swift

7 min read

Donny Wals

Oct 15 '20

Formatting dates in the user's locale using DateFormatter in Swift

#swift #ios

2 min read

Donny Wals

Mar 27 '20

I wrote a book about Apple's Combine framework

#ios #swift

1 min read

Donny Wals

Mar 4 '20

Reading and writing Property List files with Codable in Swift

#swift #ios

4 min read

Donny Wals

Feb 25 '20

How to sort an Array based on a property of an element in Swift

#swift #ios

2 min read

Donny Wals

Feb 24 '20

Working with throwing functions in Swift

#swift #ios

8 min read

Donny Wals

Feb 13 '20

Testing push notifications in the Simulator with Xcode 11.4

#ios #tutorial

3 min read

Donny Wals

Feb 5 '20

Five ways to get better at receiving feedback

#beginners

6 min read

Donny Wals

Jan 15 '20

Five tips to ask better questions

#ios #swift #productivity #beginners

6 min read

Donny Wals

Jan 9 '20

Five tips to write better todos

#ios #swift #productivity

4 min read

Donny Wals

Jan 2 '20

Getting ready to publish your app on the App Store

#ios #swift

9 min read

Donny Wals

Dec 24 '19

Using compositional collection view layouts in iOS 13

#ios #swift

11 min read

Donny Wals

Dec 24 '19

Modern table views with diffable data sources

#ios #swift

9 min read

Donny Wals

Dec 17 '19

Loose coupling and the law of Demeter

#ios #swift

6 min read

Donny Wals

Dec 16 '19

Sequencing tasks with DispatchGroup

#ios #swift

6 min read

Donny Wals

Dec 16 '19

Breaking an app up into modules

#ios #swift

12 min read

Donny Wals

Dec 16 '19

Responsibly crashing your apps

#ios #swift

8 min read

Donny Wals

Dec 13 '19

Testing your push notifications without a third party service

#ios #swift #javascript

7 min read

Donny Wals

Dec 12 '19

Scheduling daily notifications on iOS using Calendar and DateComponents

#ios #swift

6 min read

Donny Wals

Dec 10 '19

Measuring performance with os_signpost

#ios #swift

6 min read

Donny Wals

Dec 10 '19

Using Xcode's memory graph to find memory leaks

#ios #swift

5 min read

Donny Wals

Dec 8 '19

Finding slow code with Instruments

#ios #swift

5 min read

Donny Wals

Dec 8 '19

Effectively using static and class methods and properties

#ios #swift

8 min read

Donny Wals

Dec 6 '19

Understanding opaque return types in Swift 5.1

#ios #swift

8 min read

Donny Wals

Dec 5 '19

An introduction to generics in Swift using its built-in types

#ios #swift

7 min read

Donny Wals

Dec 4 '19

Efficiently loading images in table views and collection views

#ios #swift

8 min read

Donny Wals

Dec 2 '19

Changes to location access in iOS 13

#ios #swift

6 min read

Donny Wals

Dec 2 '19

Using launch arguments for easier Core Data debugging

#ios #swift

4 min read

Donny Wals

Nov 27 '19

Adding Haptics to your app

#ios #swift

9 min read

Donny Wals

Nov 25 '19

Deciding where to store data

#ios #swift #database

7 min read

Donny Wals

Nov 23 '19

Announcing: Advent of Swift

#ios #swift

1 min read

Donny Wals

Nov 20 '19

Updating your apps with silent push notifications

#ios #swift

4 min read

Donny Wals

Nov 18 '19

Real time data exchange using web sockets in iOS 13

#ios #swift

10 min read

Donny Wals

Nov 13 '19

Configuring projects with xcconfig

#ios #swift

3 min read

Donny Wals

Nov 11 '19

Building flexible components with generics and protocols

#swift #ios

11 min read

Donny Wals

Nov 8 '19

Add iOS 12 support to a new Xcode 11 Project

#ios #swift

4 min read