Scouting Swift 3

Talk from CocoaConf San Jose, November 2016. Conference materials available at https://github.com/gregheo/CocoaConfSJ2016

1. San Jose
 November 2016 Scouting Swift 3 @gregheo
2. NSSelectorForString @selector() ?
3. typedef struct objc_selector *SEL;
4. obj.performSelector("someSelector")

5. public struct Selector : ExpressibleByStringLiteral
6. obj.performSelector("someSelector")
 obj.performSelector(Selector("someSelector"))
7. #selector(NSString.init(coder:)) “initWithCoder:”
8. #keyPath(NSString.length) “length”: String
9. #keyPath #selector #available
10. Module File open public internal fileprivate { private } (scary outside world)
11. Function { } closure did not escape
12. Function { } closure escaped! # async
 store to property { }
13. @discardableResult @warn_unused_result
14. at the point of use is your most important goal CLARITY
15. func moveFromPoint(_ start: Point, toPoint: Point) moveFromPoint(startPoint, toPoint: endPoint)
16. func move(from start: Point, to end: Point) move(from: startPoint, to: endPoint)
17. NSString NSArray CGFloat NSIndexPath NSURLRequest
18. NSString NSArray CGFloat NSIndexPath NSURLRequest
19. let myQueue = DispatchQueue(label: "com.cocoaconf.queue")
 
 let mainQueue = DispatchQueue.main
20. myQueue.sync { print("Hello from a queue") } mainQueue.async { print("Hello async") }
21. myQueue.asyncAfter(deadline: .now() + 5,
 execute: ...) myQueue.asyncAfter(deadline: .now() + .nanoseconds(2500),
 execute: ...)
22. let renderer = UIGraphicsImageRenderer(
 bounds: CGRect(x: 0, y: 0, width: 100, height: 100)) let renderedImage = renderer.image { context in // drawing code goes here } UIImage
25. Safety Non-escaping closures Clarity / API changes Bridging Playgrounds
26. San Jose
 November 2016 Scouting Swift 3 @gregheo feedback $ %