What's new in Swift 2.0

Transcript

1. SWIFT 2.0 WHAT’S NEW WITH
2. FIRST WHAT SWIFT 1.2 BROUGHT ▸ Speed enhancements, optimization in the runtime. Original issue with swift vs. obj-c ▸ if-let pyramids of doom deprecated ▸ Upcasts and Downcasts with as adds some optional safety ▸ Native Set added to the collection types ▸ let constants don’t have to be set at declaration ▸ Swift first-class citizenry enforced even more
3. SWIFT 1.2 BETTER OPTIONAL BINDING
4. SWIFT 1.2 UPCASTS AND DOWNCASTS
5. SWIFT 1.2 LET CONSTANTS
6. SWIFT 1.2 NULLABILITY ANNOTATIONS FOR BETTER OBJ-C TO SWIFT ▸ nonnull, nullable, null_unspecified ▸ originally anything in the Cocoa API returned to swift an unwrapped optional (AnyObject!) ▸ potentially bad if nothing was there, no way to know! crashed at runtime! ▸ much easier to handle things like UIKit with methods that will return optionals or guaranteed instances.
7. SWIFT 1.2 NULLABILITY ANNOTATIONS CONTINUED…
8. SWIFT 2.0 SWIFT 2.0 IS HERE ▸ Protocol extensions, default method implementations inside a protocol ▸ Error Handling, we now have throw, try, and catch ! ▸ guard statement for better readability and early logic exit ▸ API availability statement ▸ Automatically synthesized headers
9. SWIFT 2.0 PROTOCOL EXTENSIONS
10. SWIFT 2.0 PROTOCOL EXTENSIONS CONTINUED…
11. SWIFT 2.0 YES YOU CAN OVERRIDE THE DEFAULT
12. SWIFT 2.0 ERROR HANDLING
13. SWIFT 2.0 GUARD STATEMENT
14. SWIFT 2.0 API AVAILABILITY
15. SWIFT 2.0 JUMP TO INTERFACE
16. SWIFT 2.0 CONVERT YOUR OBJ-C APPS NOW