Resolve recursion in Swift property override

Question

Here\'s a simple extension in Swift, for UILabel,

let dur=0.1 // (set to say 2.0 to see the effect more clearly)
extension UILabel
    {
    func change(s:String         


        

Answer 1

Your recursion is called when you use self.text= to assign a new value in your change extension method because this will call the setter, which calls change and so on.

In your second example, you avoid recursion because you can call the superclass setter from your subclass setter. You don't have this option in your extension because your code is running as an extension to UILabel and therefore there is no superclass setter to call.

Arguably creating a subclass rather than using extension is the more correct approach in this instance anyway