protocol-extension – Tarik Billa

Swift property observer in protocol extension?

December 27, 2023 by Tarik

No, this is explicitly disallowed. See Extension: Computed Properties: Extensions can add new computed properties, but they cannot add stored properties, or add property observers to existing properties. Keep in mind that if this were legal, it would add some non-trivial confusion about order of execution. Imagine there were several extensions that added didSet, and … Read more

Trailing where clause for extension of non-generic type

July 23, 2023 by Tarik

The solution was simple to switch the order in the extension clause: extension UIViewController where Self: KeyboardNotificationDelegate should be extension KeyboardNotificationDelegate where Self: UIViewController