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Useful Global Swift Functions
For historical reasons, the Swift Standard Library still has quite a few public global functions, and some of them are still useful to this day.
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Learn how to build an iOS app with MVVM architecture pattern using Swift, Combine and SwiftUI. 
The way mouse interaction works on iPad is not the same as it does on a Mac, since the cursor can morph into UI elements.
Throttling wraps a block of code with throttling logic, guaranteeing that an action will never be called more than once each specified interval.
Libraries & Tools
Auto-generated documentation for Swift. Command-click no more.

iOS bits and pieces that you can include in your project to make your life a bit easier.
If you're Bank of America, your view gets an additional setNeedsLayout in UIKit.
Apple started using the HEIC image format with iOS 11.  HEIC can cause problems for some apps. Here’s how to easily convert HEIC files to JPG.