NEW: My new book Pro SwiftUI is out now – level up your SwiftUI skills today! >>

Typecasting now includes as!

Available from Swift 1.2

Paul Hudson      @twostraws

From Swift 1.2 onwards we have three ways of performing typecasts: as is used for typecasts that will always succeed (e.g. someString as NSString), as? is used for typecasts that might fail (e.g. someView as? UIImageView), and as! is used to force typecasts. If you use as! and you're wrong, your code will crash.

For example:

let submitButton = vw.viewWithTag(10) as! UIButton
Hacking with Swift is sponsored by Play

SPONSORED Play is the first native iOS design tool created for designers and engineers. You can install Play for iOS and iPad today and sign up to check out the Beta of our macOS app with SwiftUI code export. We're also hiring engineers!

Click to learn more about Play!

Sponsor Hacking with Swift and reach the world's largest Swift community!

Other changes in Swift 1.2…

Download all Swift 1.2 changes as a playground Link to Swift 1.2 changes

Browse changes in all Swift versions

 
Unknown user

You are not logged in

Log in or create account
 

Link copied to your pasteboard.