Start using Swift.

Transcript

1. 20.01.2016 Forget Objective-C. Start Swift. for Kharkiv Mobile Devs #15
2. Alexey Demedetskiy ✤ twitter: @DAlooG ✤ email: dalog@me.com ✤ skype: nobidon
3. Objective-C ✤ KVO/KVC ✤ UIKit ✤ Monolithic namespace ✤ Partially defined behavior ✤ CoreData
4. Swift ✤ Closures ✤ Immutability ✤ Value types ✤ Generics ✤ Optionals
5. Swift ✤ Protocols ✤ Nested types ✤ Static ✤ Default values ✤ Operators
6. How to Swift? ✤ Add Swift to existing project ✤ Start new project
7. Why? ✤ Strong types —> Less errors ✤ More instruments —> Cleaner code ✤ Better syntax —> Easy to read and write
8. Optionals vs ‘nil’
9. nil ✤ [nil aMessage:@«text»] - ✅ ✤ [list addObject:nil] - ❌
10. Optional<T> ✤ T! ✤ T? ✤ T
11. Dirty Types ✤ UIKit ✤ External data (Network etc) ✤ Objective-C
12. How to clear types? ✤ as? : Any -> T? ✤ as! : Any -> T
16. WTF Immutability. ✤ Reference and Value types ✤ let - immutable name ✤ var - mutable name
17. Struct trickery ✤ How many objects will be created? ✤ How many times `print` will write? ✤ What `t1.b` will print?
18. Struct trickery ✤ 0. There is no objects. ✤ 1. ✤ 4.
19. Class trickery ✤ How many objects will be created? ✤ How many times `print` will write? ✤ What `t1.b` will print?
20. Class trickery ✤ 1 ✤ 1 ✤ -1
21. let == const?
22. let == const?
23. Value types Pros ✤ Immutable. Even with `var` ✤ `init` from compiler ✤ No inheritance
24. Properties ✤ no setter / getter methods. ✤ …unless `dynamic` is specified ✤ `willSet` / `didSet` with references to new/old values ✤ `public private(set) var …` is ok
25. enum vs NS_ENUM
26. enum vs NS_ENUM
27. Shadow types!
30. When use enum? ✤ Flags ✤ States ✤ Options ✤ Shadow type
31. Alamofire vs AFNetworking
32. Namespaces ✤ Nested types ✤ Frameworks ✤ Targets
33. Nested types
34. Nested types
35. Nested types
36. Nested types
37. Nested types
38. let = vs dispatch_once
39. Outro ✤ Run away from Obj-C ✤ Build your own logic modules ✤ Use Value Types ✤ Don’t use generics + inheritance + UIKit