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!
SAVE 50% To celebrate WWDC23, all our books and bundles are half price, so you can take your Swift knowledge further without spending big! Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testing skills, and more.
Other changes in Swift 2.2…
- ++ and -- are deprecated
- Traditional C-style for loops are deprecated
- Comparing tuples
- Tuple splat syntax is deprecated
- More keywords can be used as argument labels
- Variable parameters have been deprecated
- Renamed debug identifiers: line, function, file
- Compile-time Swift version checking
Download all Swift 2.2 changes as a playground Link to Swift 2.2 changes
