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Silicon Valley iOS Developers' Meetup, December 2016 Swift 3 Spelunking @gregheo

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Swift 2 Swift 3 Swift 4 ? current proposals

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#selector #keyPath Selector String

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@warn_unused_result @noescape

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@discardableResult @escaping

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#if swift(>=3.1) @available(swift 3.1)

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Any ‣ Classes — easy! ‣ _ObjectiveCBridgeable — easy! ‣ The rest: auto-box into _SwiftValue

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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)

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NSNumber Int8 Int16 Int32 Int64 UInt8 UInt16 UInt32 UInt64 Float Double NSValue NSRange CGPoint CGVector CGSize CGRect CGAffineTransform CATransform3D CMTime MKCoordinate NSNull _SwiftNull Optionals

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[ NSError ] Error ConcreteError domain code userInfo localizedDescription localizedFailureReason localizedRecoverySuggestion localizedRecoveryOptions …and more

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[ NSError ] CustomNSError LocalizedError RecoverableError domain code userInfo localizedDescription localizedFailureReason localizedRecoverySuggestion localizedRecoveryOptions …and more

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#if os(OSX) #endif

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#if os(OSX) || os(iOS) #endif

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#if os(OSX) || os(iOS) || os(watchOS) #endif

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#if os(OSX) || os(iOS) || os(watchOS) || os(tvOS) #endif ✈

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#if !os(Linux) // Apple platform! #else // Linux! #endif

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os()
 arch()
 swift() Linux, Windows, FreeBSD, …
 x86_64, arm, arm64, …
 by Swift version

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#if canImport(UIKit) // UIKit-based code #elseif canImport(Cocoa) // OSX code #elseif // Workaround/text, whatever #endif

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ORLY? tell me moar

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swiftunboxed.com

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apple.github.io/swift-evolution/

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Swift 3 Spelunking @gregheo feedback

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Swift 3 Spelunking @gregheo feedback