Swift blog posts, tutorials, tips, and tricks

Error handling in Combine explained with code examples

Once you get started with Combine you'll quickly run into error handling issues. Each Combine stream receives either a value ...
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• 4 min read Aug 13, 2019 Combine Swift

Array vs Set: Fundamentals in Swift explained

An Array and a Set seem to be quite the same in the beginning. They're both collection types and have ...
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• 4 min read Aug 06, 2019 Swift

Xcode refactoring options explained with examples

A brand new Xcode refactoring engine was introduced in Xcode 9. Although this is quite a few Xcode versions ago ...
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• 4 min read Jul 30, 2019 Swift Workflow

UIKeyCommand how-to add keyboard shortcuts & speed up your workflow

The UIKeyCommand class allows you to add keyboard shortcuts to your app. Although they might seem useful for iPad only, ...
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• 6 min read Jul 16, 2019 Swift Workflow

Combine debugging using operators in Swift

Combine debugging can be hard with long stack traces which don't help at all. Asynchronous callbacks follow up on each ...
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• 4 min read Jul 09, 2019 Combine Debugging Swift

Creating a custom Combine Publisher to extend UIKit

A Custom Combine Publisher can add missing functionalities to UIKit elements you use every day. A lot of boilerplate code ...
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• 4 min read Jul 02, 2019 Combine Swift

Dynamic Member Lookup combined with key paths in Swift

Dynamic member lookup has been introduced in Swift 4.2 with SE-195 and already allowed some pretty nice solutions to for ...
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• 3 min read Jun 11, 2019 Swift

Using NSBatchDeleteRequest to delete batches in Core Data

An NSBatchDeleteRequest can be used to efficiently delete a batch of entries from a Core Data SQLite persistent store. It runs ...
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• 3 min read May 21, 2019 Core Data Swift

Weak self and unowned self explained in Swift

Weak self and unowned self in Swift for many of us are hard to understand. Although Automatic Reference Counting (ARC) ...
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• 7 min read May 14, 2019 Swift

Self-documenting code to improve readability in Swift

Self-documenting code can improve the readability of your codebase. It basically means that you don't have to write comments to ...
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• 3 min read May 08, 2019 Swift

Typealias usage in Swift

A typealias in Swift is literally an alias for an existing type. Simple, isn't it? They can be useful in ...
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• 2 min read Apr 30, 2019 Swift

@unknown default usage with enums in Swift

@unknown default has been introduced in Swift 5 with SE-0192. It's a new addition to the way we can work ...
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• 3 min read Apr 09, 2019 Swift

SwiftLee

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