Swift

Learn more and get better in Swift using this list of Swift blog posts, tutorials, tips, and tricks.

How-to use Diffable Data Sources with Core Data

Diffable Data Sources were introduced at WWDC 2019 as a replacement for UICollectionViewDataSource and UITableViewDataSource. The API is available on ...
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  •  6 min read Swift

Diffable Data Sources Adoption with Ease

Diffable Data Sources were introduced at WWDC 2019 and are available since iOS 13. They're a replacement of the good ...
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  •  5 min read Swift

Persistent History Tracking in Core Data

WWDC 2017 introduced a new concept available from iOS 11 which is persistent history tracking. It's Apple's answer for merging ...
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  •  7 min read Swift

Write-Ahead Logging (WAL) disabled to force commits in Core Data

Write-Ahead Logging is the default journaling mode for Core Data SQLite stores since iOS 7 and OS X Mavericks. Journaling ...
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  •  4 min read Swift

Adding a closure as a target to UIButton and other controls in Swift

The target-action pattern is used in combination with user interface controls as a callback to a user event. Whenever a ...
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  •  2 min read Swift

ValueTransformer in Core Data explained: Storing absolute URLs

ValueTransformers in Core Data are a powerful way of transforming values before they get inserted into the database and before ...
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  •  7 min read Swift

SF Symbols: The benefits and how to use them guide

SF Symbols were introduced during WWDC 2019 and are a big present for us developers. Apple basically gave us free ...
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  •  9 min read Swift

@discardableResult in Swift explained: Ignoring return values

While writing methods in Swift you're often running into scenarios in which you sometimes want to ignore the return value ...
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  •  2 min read Swift

Core Data Performance: 6 tips you should know

Writing Core Data code with performance in mind helps to prepare your app for the future. Your database might be ...
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  •  5 min read Swift

Expressible literals in Swift explained by 3 useful examples

Expressible literals allow you to initialize types by making use of literals. There are multiple protocols available in the Swift ...
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  •  3 min read Swift

String Interpolation in Swift explained using 4 useful cases

Swift 5 introduced a decent version of string interpolation with SE-228 and updated the old version of the ExpressibleByStringInterpolation protocol ...
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  •  5 min read Swift

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 ...
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  •  5 min read DebuggingSwift