iOS for Android Developers (with Swift)

As an app developer there is always pressure to understand and be able to address both major platforms. At first blush, coding for iOS seems quite different than for Android, perhaps due to the language differences between Objective-C and Java, and of course there is a different IDE and framework. With the introduction of Swift, this chasm seems much smaller. This talk will map Android and Java functionality to similar concepts in iOS using Swift. We’ll see the similarities and differences, focusing on framework concepts, and migrate a simple Android app to iOS.

Transcript

1. iOS for Android Developers with Swift David Truxall, Ph.D. http://bit.ly/androidToIos
2. About Me @davetrux blog.davidtruxall.com
3. You • Know Java • Know Android • Don’t know Swift • Don’t know iOS • Need a Mac
4. Goal Learn basic iOS concepts for someone familiar with Android (using Swift)
5. Why? • Do I hate Android now? • Neither platform is “the winner” • Clients want both platforms • You can make more money • Swift is the new hotness in mobile • Objective-C
6. Agenda 1. Brief language intro 2. Project/Tool Structure 3. App Architecture 4. Coding Demo
7. Swift • Object-oriented AND Functional • C family • Cleaner, simpler, safer than Objective-C • Modern features
8. Compare - (NSString*) concatenateString:(NSString*)stringA withString:(NSString*)stringB { NSString *finalString = [NSString stringWithFormat:@"%@%@", stringA, stringB]; return finalString; } func concatenateString(stringA: String, stringB: String) ->String { let result = stringA + stringB return result }
9. Swift Features • Closures • Tuples and multiple return values • Generics • Structs that support methods • Functional programming patterns
10. Java/Android Swift/iOS import com.package.name; import frameworkname int counter; var counter :Int static final int LEVELS = 8; let levels = 8 private private public public - internal (*) protected - Language
11. Java/Android Swift/iOS class Foo extends Bar {} class Foo : Bar interface Baz{} protocol Baz class Foo implements Baz{} class Bar : Baz {} Foo(); init() void doWork(String arg){} func doWork(arg: String) -> Void Foo item = new Foo(); var item : Foo = Foo() item.doWork(arg); item.doWork(arg) Objects
12. Optionals ? - Has a value or no value at all (nil) ! - Implicitly Unwrapped Optional
13. Swift OO class VideoMode { var resolution : Resolution = Resolution() var interlaced = false let frameRate = 60.0 var name: String? func setUpMode(modeName: String) -> Void {<do stuff>} }
14. Swift Functional func addTwoInts(a: Int, b: Int) -> Int { return a + b } var addFunction: (Int, Int) -> Int = addTwoInts func printMath(mathFunction: (Int, Int) -> Int, a: Int, b: Int) { println("Result: \(mathFunction(a, b))") } printMath(addTwoInts, 3, 5)
15. Xcode • Free • It’s an IDE • Click not double-click • Virtual file organization
16. Demo
17. Application Architecture Model - View - Controller UI Organization and Plumbing
18. Model - View -Controller Controller Model View Update User Action Update Notify
19. Android != Model-View-Controller Activity Provider Layout Update Notify
20. iOS Model - View -Controller ViewController Custom Classes UIView Update via IBOutlet Respond to IBAction Update Notify
21. UI Organization Android iOS Layout XML XIB (NIB) - Storyboard - IBOutlet - IBAction Intent ~ Segue
22. Lifecycle Events Android iOS onCreate (onCreateView) viewDidLoad onStart viewWillAppear onResume viewDidAppear onPause viewWillDisappear onStop viewDidDisappear
23. UI Elements Android iOS TextView UILabel EditText (single line) UITextField EditText (multi-line) UITextView Button UIButton RadioGroup SegmentedControl CheckBox, ToggleButton UISwitch
24. Delegation • Class has a property that is a protocol • Second class implements the protocol • Second class assigned to the variable in the first class
25. Converting an App
26. Yet Another Shameless Plug @davetrux blog.davidtruxall.com http://bit.ly/androidToIos
27. Resources Apple's Swift iBook Swift Developer Center Migrating to Swift from Android Book Empty Application template http://bit.ly/androidToIos