iosappdevelopmentwithswiftinaction / distanceconverter Goto Github PK

In step 3 under "CONNECTING ACTIONS FROM CODE" you say:

You could also remove the @IBAction keyword from the convertToMiles()
method because this is called from code now, and isn’t connected to an event in
Interface Builder. If you forget to do this, don’t worry; it’s not strictly necessary.

But if you remove @IBAction you get the following compiler error:

[...]/DistanceConverter/DistanceConverter/ViewController.swift:25:45: Argument of '#selector' refers to instance method 'convertToMiles' that is not exposed to Objective-C
[...]/DistanceConverter/DistanceConverter/ViewController.swift:35:10: Add '@objc' to expose this instance method to Objective-C

If you use the fix button and to add @objc it works again. Not sure if that's worth mentioning in there? Or If I've just set things up wrong somewhere.

I'm enjoying the book, thanks!