Swift 3 Spelunking

A talk about Swift 2, Swift 3, and the future. Silicon Valley iOS Developers' Meetup, December 19, 2016.

1. Silicon Valley iOS Developers' Meetup, December 2016 Swift 3 Spelunking @gregheo
4. Swift 2 Swift 3 Swift 4 ? current proposals
7. #selector #keyPath Selector String
8. @warn_unused_result @noescape
9. @discardableResult @escaping
10. #if swift(>=3.1) @available(swift 3.1)
13. Any ‣ Classes — easy! ‣ _ObjectiveCBridgeable — easy! ‣ The rest: auto-box into _SwiftValue
14. let t: Any.Type = type(of: 1 as Any) print(t is Int.Type) // CHECK: true print(t is Float.Type) // CHECK: false (swift/test/Interpreter/generic_casts.swift)
15. NSNumber Int8 Int16 Int32 Int64 UInt8 UInt16 UInt32 UInt64 Float Double NSValue NSRange CGPoint CGVector CGSize CGRect CGAffineTransform CATransform3D CMTime MKCoordinate NSNull _SwiftNull Optionals
16. [ NSError ] Error ConcreteError domain code userInfo localizedDescription localizedFailureReason localizedRecoverySuggestion localizedRecoveryOptions …and more
17. [ NSError ] CustomNSError LocalizedError RecoverableError domain code userInfo localizedDescription localizedFailureReason localizedRecoverySuggestion localizedRecoveryOptions …and more
19. #if os(OSX) #endif
20. #if os(OSX) || os(iOS) #endif
21. #if os(OSX) || os(iOS) || os(watchOS) #endif
22. #if os(OSX) || os(iOS) || os(watchOS) || os(tvOS) #endif ✈
23. #if !os(Linux) // Apple platform! #else // Linux! #endif
24. os()
 arch()
 swift() Linux, Windows, FreeBSD, …
 x86_64, arm, arm64, …
 by Swift version
25. #if canImport(UIKit) // UIKit-based code #elseif canImport(Cocoa) // OSX code #elseif // Workaround/text, whatever #endif
28. ORLY? tell me moar
29. swiftunboxed.com
30. apple.github.io/swift-evolution/
34. Swift 3 Spelunking @gregheo feedback
35. Swift 3 Spelunking @gregheo feedback