Transcript
func migrating(from: ObjC) -> Swift!
[objC autorelease]
Why?
https://twitter.com/clattner_llvm
WWDC Appearances
swift objective-c
2014 19 632015 71 15
„…in future, all the nice things will only
come to swift…“Apple Software Engineer
What will you loseon the way?
* [ ] .h .mGood old Friends
Runtime Dynamics
NSInvocation NSMethodSignature
[obj load] nil messaging
Macros
https://developer.apple.com/swift/blog/?id=19
What will you gain?
Types
Autoclosures
Structs
Generics
Implicit Member Expressions
Custom Operators
Typealiases
Enums
Currying
Recursive Enumerations
Property ObserversProtocol Extensions
Generators
Subscripts
Optionals
Lazyness
Pattern Matching
Tuples
Immutability
ErrorType
Access Control
Simplicity
view.backgroundColor = .redColor()
[view setBackgroundColor: [UIColor redColor]]
@warn_unused_result func flatMap<T> (@noescape _ transform:
(Self.Generator.Element) throws -> T?) rethrows -> [T]
Kinda Simplicity
https://developer.apple.com/library/ios/documentation/Swift/Reference/Swift_SequenceType_Protocol/index.html
https://github.com/typelift/Swiftz/blob/master/Swiftz/EitherExt.swift
Not-So-Simplicity-At-All
What will remain?
SDKXYZKit
Model View ControllerRetain Cycles
Xcode
How to start?
Existing Objective-C ProjectNo Warnings 😇
https://developer.apple.com/library/ios/documentation/Swift/Conceptual/BuildingCocoaApps/index.html#//apple_ref/doc/uid/TP40014216-CH2-ID0
Using Swift with Cocoa and Objective-C
Bridging HeaderAdd Imports as you need them
Automatically generated by compilerGenerated Header
…using obj-c in swift…
…using swift in obj-c…
Optimize Obj-C for Swift
NS_ASSUME_NONNULL_BEGIN nonnull|nullable|null_unspecified
NSArray<__kindof UIView *> *someViews;
https://developer.apple.com/videos/play/wwdc2015-401/
Try to avoid designing Swift for Obj-C
You’ll have access to anything within a class or protocol that’s marked with the @objc attribute as long as it’s compatible with Objective-C. This excludes Swift-only features such as those listed here:
Generics Tuples Enumerations defined in Swift without Int raw value type Structures defined in Swift Top-level functions defined in Swift Global variables defined in Swift Typealiases defined in Swift Swift-style variadics Nested types Curried functions
https://developer.apple.com/library/ios/documentation/Swift/Conceptual/BuildingCocoaApps/MixandMatch.html#//apple_ref/doc/
uid/TP40014216-CH10-ID122
Adding New Controller
Refactor Existing Controller1 2
Where to use Swift in the beginning?
It`s ok to build a parallel universe
Find New Solutions™ and yeah, use guard…
Swift will makeyour life easier
title = ~"Select Title"
Custom Operator for i18n
struct Storyboard { struct Segues { static let channelInfo = "channelInfo" } struct Cells { static let channelCell = "channelCell" } struct ReuseView { static let sectionHeader = "header" } }
Swift will makeyour life easier
Define Segues, Identifier, and so forth
Swift will makeyour life easier
@IBOutlet weak var myCellView: UIView! { didSet { myCellView.backgroundColor = .redColor() myCellView.layer.masksToBounds = true myCellView.layer.cornerRadius = 2 } }
Configure Views after outlet binding
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
switch (segue.identifier, segue.destinationViewController, collectionView?.indexPathsForSelectedItems()?.first) { case let(Storyboard.Segues.info?, controller as InfoController, index?): controller.channel = channels?.get(index.row)
default: break } }
Swift will makeyour life easier
Pattern Match Your Life
Swift will makeyour life easier
for (a, b) in (0...2).zipWithFollower() { print(a, b) // 0,1 1,2 2,nil }
public struct ZipWithFollower<T: SequenceType>: SequenceType { public typealias Generator = AnyGenerator<(T.Generator.Element, T.Generator.Element?)> let sequence: T public init(_ sequence: T) { self.sequence = sequence } public func generate() -> Generator { var generator1 = sequence.generate() var generator2 = sequence.generate() _ = generator2.next() return anyGenerator { guard let element1 = generator1.next() else { return nil } return (element1, generator2.next()) } } }
Clean up your control flow
struct StateFlow<S,T> { let at: S let to: T -> S }
let wizardFlow: [StateFlow<WizardState, WizardConfig>] = [ from(.Init).to { config in if config.useCustomSeletion { return .ComponentWizard } return .ComponentSelection } ]
Swift will makeyour life easier
Double Down on Types
top related