One unwelcome quirk of Swift before 2.2 was that selectors could be written as strings, like this:
navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Tap!", style: .Plain, target: self, action: "buttonTaped")
If you look closely, I wrote
"buttonTaped" rather than
"buttonTapped", but Xcode wasn't able to notify me of my mistake if either of those methods didn't exist.
This has been resolved as of Swift 2.2: using strings for selectors has been deprecated, and you should now write
#selector(buttonTapped) in that code above. If the
buttonTapped() method doesn't exist, you'll get a compile error – another whole class of bugs eliminated at compile time!
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