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let swift == val kotlin → WHY IOS IS SO IMPORTANT FOR ANDROID, AND VICE VERSA Jorge Coca

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LET'S BUILD A NEW startup

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la la land DROIDCON NYC EDITION

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LA LA LAND DROIDCON EDITION ▸ Cast ▸ Songs ▸ Song details ▸ Mark song as favorite

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!

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MODERN DEVELOPMENT OPTIONS

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MODERN DEVELOPMENT OPTIONS ▸ Native

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MODERN DEVELOPMENT OPTIONS ▸ Native ▸ Progressive Web App

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MODERN DEVELOPMENT OPTIONS ▸ Native ▸ Progressive Web App ▸ React Native

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MODERN DEVELOPMENT OPTIONS ▸ Native ▸ Progressive Web App ▸ React Native ▸ Flutter

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Our team decides to create a native iOS and Android app, but...

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... we want to share our architecture between plaforms...

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... and, if possible, we do not want to write the same business logic twice

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WHY NOT?

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WHY NOT? ▸ Particular to our app/use case

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WHY NOT? ▸ Particular to our app/use case ▸ Time

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WHY NOT? ▸ Particular to our app/use case ▸ Time ▸ Money

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WHY NOT? ▸ Particular to our app/use case ▸ Time ▸ Money ▸ (Du)plicated efforts

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THAT SOUNDS AWESOME, BUT...

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CAN WE DO IT?

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!

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MULTIPLATFORM EFFORTS PRINCIPLES Isolate your business logic from: - Presentation - Operating system

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MULTIPLATFORM EFFORTS PRINCIPLES Isolate your business logic from: - Presentation - Operating system ▸ Also known as layers, clean code, the onion model...

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Sooner than we think, multiplatform developers will be on very high demand — Jorge Coca, visionary

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WHAT ARE WE GOING TO ACHIEVE IN THIS TALK?

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WHAT ARE WE GOING TO ACHIEVE IN THIS TALK? ▸ Intro to iOS development

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WHAT ARE WE GOING TO ACHIEVE IN THIS TALK? ▸ Intro to iOS development ▸ Xcode

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WHAT ARE WE GOING TO ACHIEVE IN THIS TALK? ▸ Intro to iOS development ▸ Xcode ▸ Swift

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WHAT ARE WE GOING TO ACHIEVE IN THIS TALK? ▸ Intro to iOS development ▸ Xcode ▸ Swift ▸ UI design with Storyboards

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WHAT ARE WE GOING TO ACHIEVE IN THIS TALK? ▸ Intro to iOS development ▸ Xcode ▸ Swift ▸ UI design with Storyboards ▸ ... from the point of view of an Android dev

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LET'S GET STARTED!

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LANGUAGES & TOOLS ANDROID IOS Android Studio Xcode Kotlin Swift Java Objective-C

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ANDROID IOS XML Layout Storyboard Activity/Fragment/ CustomView UIViewController BottomNavigationBar TabBarController RecyclerView with GridLayoutManager UICollectionView ImageView UIImageView TextView UILabel

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THERE'S A TON OF DRAG & DROP IN STORYBOARDS

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UIVIEWCONTROLLER.SWIFT import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } }

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UIVIEWCONTROLLER.SWIFT import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } }

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UIVIEWCONTROLLER.SWIFT import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } }

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UIVIEWCONTROLLER.SWIFT import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } }

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UIVIEWCONTROLLER.SWIFT import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } }

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EASY, RIGHT?

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UIVIEWCONTROLLER.SWIFT import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } }

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UIKIT?

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UIKIT? ▸ Cocoa Touch is a framework for developing iOS applications.

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UIKIT? ▸ Cocoa Touch is a framework for developing iOS applications. ▸ UIKit for UI components (buttons, labels)

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UIKIT? ▸ Cocoa Touch is a framework for developing iOS applications. ▸ UIKit for UI components (buttons, labels) ▸ Foundation (NSString, NSObject) is the base framework for Apple products

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... it's like the Android SDK and the Support Libraries and the language, all in one...

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LET'S ADD THE NAVIGATION CONTROLLER AND THE TAB BAR CONTROLLER

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... WAIT, DO WE HAVE CONTROLLERS AND VIEWCONTROLLERS? ▸ MVC is the default architectural pattern

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WHERE IS MY Adapter AND MY ViewHolder? protocol is the equivalent of an interface protocol extensions as Kotlin extensions

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WHERE IS MY Adapter AND MY ViewHolder? ▸ UICollectionView is like a RecyclerView, but for grids protocol is the equivalent of an interface protocol extensions as Kotlin extensions

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WHERE IS MY Adapter AND MY ViewHolder? ▸ UICollectionView is like a RecyclerView, but for grids ▸ UICollectionViewDataSource is the protocol that owns the data protocol is the equivalent of an interface protocol extensions as Kotlin extensions

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WHERE IS MY Adapter AND MY ViewHolder? ▸ UICollectionView is like a RecyclerView, but for grids ▸ UICollectionViewDataSource is the protocol that owns the data ▸ UICollectionViewDelegate is the protocol that owns the interaction protocol is the equivalent of an interface protocol extensions as Kotlin extensions

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WHERE IS MY Adapter AND MY ViewHolder? ▸ UICollectionView is like a RecyclerView, but for grids ▸ UICollectionViewDataSource is the protocol that owns the data ▸ UICollectionViewDelegate is the protocol that owns the interaction ▸ UICollectionViewCell is the UI representation of a single item protocol is the equivalent of an interface protocol extensions as Kotlin extensions

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ARTISTVIEWCELL.SWIFT import UIKit class ArtistViewCell : UICollectionViewCell { @IBOutlet var headshotImage: UIImageView! @IBOutlet var artistName: UILabel! func displayContent(headshot: UIImage, name: String) { headshotImage.image = headshot artistName.text = name } }

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ARTISTVIEWCELL.SWIFT import UIKit class ArtistViewCell : UICollectionViewCell { @IBOutlet var headshotImage: UIImageView! @IBOutlet var artistName: UILabel! func displayContent(headshot: UIImage, name: String) { headshotImage.image = headshot artistName.text = name } }

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@IBOUTLET It is a keyword added to a variable declaration. It binds your code variable to a UI element in the storyboard

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var AND let/val KOTLIN SWIFT MUTABLE? var var Yes val let No

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@IBACTION It is a keyword added to a method declaration. It binds your code method to a UI action in the storyboard

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IMPLICITLY UNWRAPPED OPTIONALS import UIKit class ArtistViewCell : UICollectionViewCell { @IBOutlet var headshotImage: UIImageView! @IBOutlet var artistName: UILabel! func displayContent(artist: Artist) { headshotImage.image = artist.headshot artistName.text = artist.name } }

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IMPLICITLY UNWRAPPED OPTIONALS import UIKit class ArtistViewCell : UICollectionViewCell { @IBOutlet var headshotImage: UIImageView! @IBOutlet var artistName: UILabel! func displayContent(artist: Artist) { headshotImage.image = artist.headshot artistName.text = artist.name } }

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ARTIST.SWIFT import Foundation import UIKit struct Artist { let name: String let headshot: UIImage init(name: String, headshot: UIImage) { self.name = name self.headshot = headshot } } let emmaStone = Artist(name: "Emma Stone", headshot: UIImage("emma.png"))

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ARTIST.SWIFT import Foundation import UIKit struct Artist { let name: String let headshot: UIImage init(name: String, headshot: UIImage) { self.name = name self.headshot = headshot } } let emmaStone = Artist(name: "Emma Stone", headshot: UIImage("emma.png"))

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ARTIST.SWIFT import Foundation import UIKit struct Artist { let name: String let headshot: UIImage init(name: String, headshot: UIImage) { self.name = name self.headshot = headshot } } let emmaStone = Artist(name: "Emma Stone", headshot: UIImage("emma.png"))

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ARTIST.SWIFT import Foundation import UIKit struct Artist { let name: String let headshot: UIImage init(name: String, headshot: UIImage) { self.name = name self.headshot = headshot } } let emmaStone = Artist(name: "Emma Stone", headshot: UIImage("emma.png"))

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STRUCTS

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STRUCTS ▸ Best intended for storing data properties

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STRUCTS ▸ Best intended for storing data properties ▸ ... are value type, meaning it's value is copied when assigned or passed

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CASTVIEWCONTROLLER import UIKit class CastViewController : UIViewController, UICollectionViewDataSource { @IBOutlet var castCollectionView: UICollectionView! let cast = CastStore.sharedInstance // MARK: UICollectionViewDataSource func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { return cast.count } func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "artistCellView", for: indexPath) as! ArtistViewCell let artist = cast[indexPath.row] cell.displayContent(headshot: artist.headshot, name: artist.name) return cell } }

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CASTVIEWCONTROLLER import UIKit class CastViewController : UIViewController, UICollectionViewDataSource { @IBOutlet var castCollectionView: UICollectionView! let cast = CastStore.sharedInstance // MARK: UICollectionViewDataSource func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { return cast.count } func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "artistCellView", for: indexPath) as! ArtistViewCell let artist = cast[indexPath.row] cell.displayContent(headshot: artist.headshot, name: artist.name) return cell } }

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CASTVIEWCONTROLLER import UIKit class CastViewController : UIViewController, UICollectionViewDataSource { @IBOutlet var castCollectionView: UICollectionView! let cast = CastStore.sharedInstance // MARK: UICollectionViewDataSource func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { return cast.count } func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "artistCellView", for: indexPath) as! ArtistViewCell let artist = cast[indexPath.row] cell.displayContent(headshot: artist.headshot, name: artist.name) return cell } }

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CASTVIEWCONTROLLER import UIKit class CastViewController : UIViewController, UICollectionViewDataSource { @IBOutlet var castCollectionView: UICollectionView! let cast = CastStore.sharedInstance // MARK: UICollectionViewDataSource func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { return cast.count } func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "artistCellView", for: indexPath) as! ArtistViewCell let artist = cast[indexPath.row] cell.displayContent(headshot: artist.headshot, name: artist.name) return cell } }

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CASTVIEWCONTROLLER import UIKit class CastViewController : UIViewController, UICollectionViewDataSource { @IBOutlet var castCollectionView: UICollectionView! let cast = CastStore.sharedInstance // MARK: UICollectionViewDataSource func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { return cast.count } func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "artistCellView", for: indexPath) as! ArtistViewCell let artist = cast[indexPath.row] cell.displayContent(headshot: artist.headshot, name: artist.name) return cell } }

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LET'S DO SOMETHING A BIT MORE COMPLEX

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SONGS

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SONGS ▸ UITableView with data source and delegate

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SONGS ▸ UITableView with data source and delegate ▸ UITableViewCell with 3 UILabel

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SONGS ▸ UITableView with data source and delegate ▸ UITableViewCell with 3 UILabel ▸ Segue to SongDetailsViewController

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SONG DETAILS

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SONG DETAILS ▸ Part of stack of UINavigationController

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SONG DETAILS ▸ Part of stack of UINavigationController ▸ UIImage

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SONG DETAILS ▸ Part of stack of UINavigationController ▸ UIImage ▸ UILabel

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SONG DETAILS ▸ Part of stack of UINavigationController ▸ UIImage ▸ UILabel ▸ UIText

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SONG DETAILS ▸ Part of stack of UINavigationController ▸ UIImage ▸ UILabel ▸ UIText ▸ UIButton

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EXAMPLE OF DATASTORE final class DataStore { static func songs() -> [Song] { var songs = [Song]() songs.append(Song(orderNumber: 1, name: "Another day of sun", artist: "La La Land Cast", isFavorite: true, lyrics: """ I think about that day I left him at a Greyhound station West of Santa Fé """)) return songs } }

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EXAMPLE OF DATASTORE final class DataStore { static func songs() -> [Song] { var songs = [Song]() songs.append(Song(orderNumber: 1, name: "Another day of sun", artist: "La La Land Cast", isFavorite: true, lyrics: """ I think about that day I left him at a Greyhound station West of Santa Fé """)) return songs } }

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EXAMPLE OF DATASTORE final class DataStore { static func songs() -> [Song] { var songs = [Song]() songs.append(Song(orderNumber: 1, name: "Another day of sun", artist: "La La Land Cast", isFavorite: true, lyrics: """ I think about that day I left him at a Greyhound station West of Santa Fé """)) return songs } }

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EXAMPLE OF DATASTORE final class DataStore { static func songs() -> [Song] { var songs = [Song]() songs.append(Song(orderNumber: 1, name: "Another day of sun", artist: "La La Land Cast", isFavorite: true, lyrics: """ I think about that day I left him at a Greyhound station West of Santa Fé """)) return songs } }

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import UIKit class SongsViewController : UIViewController, UITableViewDataSource, UITableViewDelegate { @IBOutlet var tableView: UITableView! let songs = DataStore.songs() // MARK: UIViewController override func prepare(for segue: UIStoryboardSegue, sender: Any?) { if (segue.identifier == "songDetailsSegue") { if let indexPath = self.tableView.indexPathForSelectedRow { let songDetailsViewController = segue.destination as! SongDetailsViewController let selectedSong = songs[indexPath.row] songDetailsViewController.selectedSong = selectedSong } } } // MARK: UITableViewDataSource func numberOfSections(in tableView: UITableView) -> Int { return 1 } func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return songs.count } func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCell(withIdentifier: "songCellIdentifier") as! SongViewCell let song = songs[indexPath.row] cell.bind(song: song) return cell } // MARK: UITableViewDelegate func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { performSegue(withIdentifier: "songDetailsSegue", sender: self) } }

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UITABLEVIEWDATASOURCE import UIKit class SongsViewController : UIViewController, UITableViewDataSource, UITableViewDelegate { let songs = DataStore.songs() ... // MARK: UITableViewDataSource func numberOfSections(in tableView: UITableView) -> Int { return 1 } func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return songs.count } func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCell(withIdentifier: "songCellIdentifier") as! SongViewCell let song = songs[indexPath.row] cell.bind(song: song) return cell } }

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UITABLEVIEWDATASOURCE import UIKit class SongsViewController : UIViewController, UITableViewDataSource, UITableViewDelegate { let songs = DataStore.songs() ... // MARK: UITableViewDataSource func numberOfSections(in tableView: UITableView) -> Int { return 1 } func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return songs.count } func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCell(withIdentifier: "songCellIdentifier") as! SongViewCell let song = songs[indexPath.row] cell.bind(song: song) return cell } }

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UITABLEVIEWDATASOURCE import UIKit class SongsViewController : UIViewController, UITableViewDataSource, UITableViewDelegate { let songs = DataStore.songs() ... // MARK: UITableViewDataSource func numberOfSections(in tableView: UITableView) -> Int { return 1 } func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return songs.count } func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCell(withIdentifier: "songCellIdentifier") as! SongViewCell let song = songs[indexPath.row] cell.bind(song: song) return cell } }

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UITABLEVIEWDATASOURCE import UIKit class SongsViewController : UIViewController, UITableViewDataSource, UITableViewDelegate { let songs = DataStore.songs() ... // MARK: UITableViewDataSource func numberOfSections(in tableView: UITableView) -> Int { return 1 } func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return songs.count } func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCell(withIdentifier: "songCellIdentifier") as! SongViewCell let song = songs[indexPath.row] cell.bind(song: song) return cell } }

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UITABLEVIEWDATASOURCE import UIKit class SongsViewController : UIViewController, UITableViewDataSource, UITableViewDelegate { let songs = DataStore.songs() ... // MARK: UITableViewDataSource func numberOfSections(in tableView: UITableView) -> Int { return 1 } func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return songs.count } func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCell(withIdentifier: "songCellIdentifier") as! SongViewCell let song = songs[indexPath.row] cell.bind(song: song) return cell } }

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UITABLEVIEWDATASOURCE import UIKit class SongsViewController : UIViewController, UITableViewDataSource, UITableViewDelegate { let songs = DataStore.songs() ... // MARK: UITableViewDataSource func numberOfSections(in tableView: UITableView) -> Int { return 1 } func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return songs.count } func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCell(withIdentifier: "songCellIdentifier") as! SongViewCell let song = songs[indexPath.row] cell.bind(song: song) return cell } }

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UITABLEVIEWDELEGATE import UIKit class SongsViewController : UIViewController, UITableViewDataSource, UITableViewDelegate { @IBOutlet var tableView: UITableView! let songs = DataStore.songs() // MARK: UIViewController override func prepare(for segue: UIStoryboardSegue, sender: Any?) { if (segue.identifier == "songDetailsSegue") { if let indexPath = self.tableView.indexPathForSelectedRow { let songDetailsViewController = segue.destination as! SongDetailsViewController let selectedSong = songs[indexPath.row] songDetailsViewController.selectedSong = selectedSong } } } // MARK: UITableViewDelegate func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { performSegue(withIdentifier: "songDetailsSegue", sender: self) } ... }

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UITABLEVIEWDELEGATE import UIKit class SongsViewController : UIViewController, UITableViewDataSource, UITableViewDelegate { @IBOutlet var tableView: UITableView! let songs = DataStore.songs() // MARK: UIViewController override func prepare(for segue: UIStoryboardSegue, sender: Any?) { if (segue.identifier == "songDetailsSegue") { if let indexPath = self.tableView.indexPathForSelectedRow { let songDetailsViewController = segue.destination as! SongDetailsViewController let selectedSong = songs[indexPath.row] songDetailsViewController.selectedSong = selectedSong } } } // MARK: UITableViewDelegate func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { performSegue(withIdentifier: "songDetailsSegue", sender: self) } ... }

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UITABLEVIEWDELEGATE import UIKit class SongsViewController : UIViewController, UITableViewDataSource, UITableViewDelegate { @IBOutlet var tableView: UITableView! let songs = DataStore.songs() // MARK: UIViewController override func prepare(for segue: UIStoryboardSegue, sender: Any?) { if (segue.identifier == "songDetailsSegue") { if let indexPath = self.tableView.indexPathForSelectedRow { let songDetailsViewController = segue.destination as! SongDetailsViewController let selectedSong = songs[indexPath.row] songDetailsViewController.selectedSong = selectedSong } } } // MARK: UITableViewDelegate func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { performSegue(withIdentifier: "songDetailsSegue", sender: self) } ... }

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UITABLEVIEWDELEGATE import UIKit class SongsViewController : UIViewController, UITableViewDataSource, UITableViewDelegate { @IBOutlet var tableView: UITableView! let songs = DataStore.songs() // MARK: UIViewController override func prepare(for segue: UIStoryboardSegue, sender: Any?) { if (segue.identifier == "songDetailsSegue") { if let indexPath = self.tableView.indexPathForSelectedRow { let songDetailsViewController = segue.destination as! SongDetailsViewController let selectedSong = songs[indexPath.row] songDetailsViewController.selectedSong = selectedSong } } } // MARK: UITableViewDelegate func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { performSegue(withIdentifier: "songDetailsSegue", sender: self) } ... }

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SONGDETAILSVIEWCONTROLLER import UIKit class SongDetailsViewController : UIViewController { var selectedSong: Song! @IBOutlet var artistLabel: UILabel! @IBOutlet var descriptionText: UITextView! @IBOutlet weak var favoriteButton: UIButton! override func viewDidLoad() { super.viewDidLoad() artistLabel.text = selectedSong.artist descriptionText.text = selectedSong.lyrics } @IBAction func toggleFavorite(_ sender: UIButton) { if (selectedSong.isFavorite) { selectedSong.isFavorite = false favoriteButton.setTitle(" ! ", for: UIControlState.normal) } else { selectedSong.isFavorite = true favoriteButton.setTitle(" ❤ ", for: UIControlState.normal) } } }

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SONGDETAILSVIEWCONTROLLER import UIKit class SongDetailsViewController : UIViewController { var selectedSong: Song! @IBOutlet var artistLabel: UILabel! @IBOutlet var descriptionText: UITextView! @IBOutlet weak var favoriteButton: UIButton! override func viewDidLoad() { super.viewDidLoad() artistLabel.text = selectedSong.artist descriptionText.text = selectedSong.lyrics } @IBAction func toggleFavorite(_ sender: UIButton) { if (selectedSong.isFavorite) { selectedSong.isFavorite = false favoriteButton.setTitle(" ! ", for: UIControlState.normal) } else { selectedSong.isFavorite = true favoriteButton.setTitle(" ❤ ", for: UIControlState.normal) } } }

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SONGDETAILSVIEWCONTROLLER import UIKit class SongDetailsViewController : UIViewController { var selectedSong: Song! @IBOutlet var artistLabel: UILabel! @IBOutlet var descriptionText: UITextView! @IBOutlet weak var favoriteButton: UIButton! override func viewDidLoad() { super.viewDidLoad() artistLabel.text = selectedSong.artist descriptionText.text = selectedSong.lyrics } @IBAction func toggleFavorite(_ sender: UIButton) { if (selectedSong.isFavorite) { selectedSong.isFavorite = false favoriteButton.setTitle(" ! ", for: UIControlState.normal) } else { selectedSong.isFavorite = true favoriteButton.setTitle(" ❤ ", for: UIControlState.normal) } } }

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SONGDETAILSVIEWCONTROLLER import UIKit class SongDetailsViewController : UIViewController { var selectedSong: Song! @IBOutlet var artistLabel: UILabel! @IBOutlet var descriptionText: UITextView! @IBOutlet weak var favoriteButton: UIButton! override func viewDidLoad() { super.viewDidLoad() artistLabel.text = selectedSong.artist descriptionText.text = selectedSong.lyrics } @IBAction func toggleFavorite(_ sender: UIButton) { if (selectedSong.isFavorite) { selectedSong.isFavorite = false favoriteButton.setTitle(" ! ", for: UIControlState.normal) } else { selectedSong.isFavorite = true favoriteButton.setTitle(" ❤ ", for: UIControlState.normal) } } }

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SONGDETAILSVIEWCONTROLLER import UIKit class SongDetailsViewController : UIViewController { var selectedSong: Song! @IBOutlet var artistLabel: UILabel! @IBOutlet var descriptionText: UITextView! @IBOutlet weak var favoriteButton: UIButton! override func viewDidLoad() { super.viewDidLoad() artistLabel.text = selectedSong.artist descriptionText.text = selectedSong.lyrics } @IBAction func toggleFavorite(_ sender: UIButton) { if (selectedSong.isFavorite) { selectedSong.isFavorite = false favoriteButton.setTitle(" ! ", for: UIControlState.normal) } else { selectedSong.isFavorite = true favoriteButton.setTitle(" ❤ ", for: UIControlState.normal) } } }

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PROFIT TIME! !"

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... well, not really, right?

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!

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Let's talk about networking and persistence

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NETWORKING

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NETWORKING ▸ URLRequest as the simplest method. Built in.

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NETWORKING ▸ URLRequest as the simplest method. Built in. ▸ URLSession seems to be the current preferred option. Built in.

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NETWORKING ▸ URLRequest as the simplest method. Built in. ▸ URLSession seems to be the current preferred option. Built in. ▸ Alamofire is an easy to use, but heavy, framework

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NETWORKING ▸ URLRequest as the simplest method. Built in. ▸ URLSession seems to be the current preferred option. Built in. ▸ Alamofire is an easy to use, but heavy, framework ▸ ... but hey, nothing like Retrofit

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NETWORKING ▸ URLRequest as the simplest method. Built in. ▸ URLSession seems to be the current preferred option. Built in. ▸ Alamofire is an easy to use, but heavy, framework ▸ ... but hey, nothing like Retrofit ▸ ... and let's not even talk about Moshi or Gson...

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CALLING A REST API let url = URL(string: "https://la.la.land/songs/top?api_key=DEMO_KEY") let task = URLSession.shared.dataTask(with: url!) { (data, response, error) in if let data = data { do { let jsonSerialized = try JSONSerialization.jsonObject(with: data, options: []) as? [String : Any] if let json = jsonSerialized, let name = json["name"], let artist = json["artist"] { print(url) print(explanation) } } catch let error as NSError { print(error.localizedDescription) } } else if let error = error { print(error.localizedDescription) } } task.resume()

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CALLING A REST API let url = URL(string: "https://la.la.land/songs/top?api_key=DEMO_KEY") let task = URLSession.shared.dataTask(with: url!) { (data, response, error) in if let data = data { do { let jsonSerialized = try JSONSerialization.jsonObject(with: data, options: []) as? [String : Any] if let json = jsonSerialized, let name = json["name"], let artist = json["artist"] { print(url) print(explanation) } } catch let error as NSError { print(error.localizedDescription) } } else if let error = error { print(error.localizedDescription) } } task.resume()

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CALLING A REST API let url = URL(string: "https://la.la.land/songs/top?api_key=DEMO_KEY") let task = URLSession.shared.dataTask(with: url!) { (data, response, error) in if let data = data { do { let jsonSerialized = try JSONSerialization.jsonObject(with: data, options: []) as? [String : Any] if let json = jsonSerialized, let name = json["name"], let artist = json["artist"] { print(url) print(explanation) } } catch let error as NSError { print(error.localizedDescription) } } else if let error = error { print(error.localizedDescription) } } task.resume()

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CALLING A REST API let url = URL(string: "https://la.la.land/songs/top?api_key=DEMO_KEY") let task = URLSession.shared.dataTask(with: url!) { (data, response, error) in if let data = data { do { let jsonSerialized = try JSONSerialization.jsonObject(with: data, options: []) as? [String : Any] if let json = jsonSerialized, let name = json["name"], let artist = json["artist"] { print(url) print(explanation) } } catch let error as NSError { print(error.localizedDescription) } } else if let error = error { print(error.localizedDescription) } } task.resume()

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PERSISTENCE

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PERSISTENCE ▸ SQLite supported out of the box

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PERSISTENCE ▸ SQLite supported out of the box ▸ FMDB or SQLite.swift as wrappers

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PERSISTENCE ▸ SQLite supported out of the box ▸ FMDB or SQLite.swift as wrappers ▸ ... but not as good as Room

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PERSISTENCE ▸ SQLite supported out of the box ▸ FMDB or SQLite.swift as wrappers ▸ ... but not as good as Room ▸ Oh yeah! And Core Data

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CORE DATA

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CORE DATA ▸ Manage object graphs and object lifecycle, including persistence.

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CORE DATA ▸ Manage object graphs and object lifecycle, including persistence. ▸ Use Core Data to manage the model layer objects in your application.

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CORE DATA ▸ Manage object graphs and object lifecycle, including persistence. ▸ Use Core Data to manage the model layer objects in your application. ▸ ... so it's like a model and persistence layer, all in one

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!"

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Biggest efforts on Multiplatform happening on the networking and persistence layers

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LEARNING RESOURCES

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LEARNING RESOURCES ▸ Ray Wenderlich, community supported

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LEARNING RESOURCES ▸ Ray Wenderlich, community supported ▸ Big Nerd Ranch, world class training!

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LEARNING RESOURCES ▸ Ray Wenderlich, community supported ▸ Big Nerd Ranch, world class training! ▸ NSHipster by @mattt

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LEARNING RESOURCES ▸ Ray Wenderlich, community supported ▸ Big Nerd Ranch, world class training! ▸ NSHipster by @mattt ▸ Flight School, also by @mattt

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...and finally...

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Thank you!