After some times creating different iOS apps following an MVVM pattern, I’m often not sure how to implement the navigation. If the View handles the rendering and user’s interactions and the ViewModel the service or business logic, where does the navigation sit? That’s where Coordinator pattern takes place.

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The delegation pattern is one of the most common design pattern in iOS. You probably use it on daily basis without noticing, every time you create a UITableView or UICollectionView and implementing their delegates. Let’s see how it works and how to implement it in Swift.

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During this year, I have blogged quite a bit about code architecture in Swift and I’ve realized that I didn’t explain much about which design pattern to use with it. In a series of coming posts, I will cover different design patterns, starting now with observer.

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Benoit Pasquier

iOS Software engineer 🇫🇷, writing about Swift, Data and more.


Singapore 🇸🇬