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
SPONSORED Build Chat messaging quickly with Stream Chat. The Stream iOS Chat SDK is highly flexible, customizable, and crazy optimized for performance. Take advantage of this top-notch developer experience, get started for free today!
Sponsor Hacking with Swift and reach the world's largest Swift community!
Other changes in Swift 1.2…
- The zip() function joins two sequences
- The flatMap() method transforms optionals and arrays
- Closures can now be marked @noescape
- Classes can now have static methods and properties
- Constants no longer require immediate initialization
- A new Set data structure
- Implicit bridging has been reduced
- Multiple if let bindings
Download all Swift 1.2 changes as a playground Link to Swift 1.2 changes
