let swift == val kotlin -> Why iOS is so important for Android, and vice versa

Droidcon NYC 2018

Transcript

1. let swift == val kotlin → WHY IOS IS SO IMPORTANT FOR ANDROID, AND VICE VERSA Jorge Coca
2. LET'S BUILD A NEW startup
3. la la land DROIDCON NYC EDITION
4. LA LA LAND DROIDCON EDITION ▸ Cast ▸ Songs ▸ Song details ▸ Mark song as favorite
6. !
7. MODERN DEVELOPMENT OPTIONS
8. MODERN DEVELOPMENT OPTIONS ▸ Native
9. MODERN DEVELOPMENT OPTIONS ▸ Native ▸ Progressive Web App
10. MODERN DEVELOPMENT OPTIONS ▸ Native ▸ Progressive Web App ▸ React Native
11. MODERN DEVELOPMENT OPTIONS ▸ Native ▸ Progressive Web App ▸ React Native ▸ Flutter
12. Our team decides to create a native iOS and Android app, but...
13. ... we want to share our architecture between plaforms...
14. ... and, if possible, we do not want to write the same business logic twice
16. WHY NOT?
17. WHY NOT? ▸ Particular to our app/use case
18. WHY NOT? ▸ Particular to our app/use case ▸ Time
19. WHY NOT? ▸ Particular to our app/use case ▸ Time ▸ Money
20. WHY NOT? ▸ Particular to our app/use case ▸ Time ▸ Money ▸ (Du)plicated efforts
21. THAT SOUNDS AWESOME, BUT...
22. CAN WE DO IT?
23. !
24. MULTIPLATFORM EFFORTS PRINCIPLES Isolate your business logic from: - Presentation - Operating system
25. MULTIPLATFORM EFFORTS PRINCIPLES Isolate your business logic from: - Presentation - Operating system ▸ Also known as layers, clean code, the onion model...
27. Sooner than we think, multiplatform developers will be on very high demand — Jorge Coca, visionary
28. WHAT ARE WE GOING TO ACHIEVE IN THIS TALK?
29. WHAT ARE WE GOING TO ACHIEVE IN THIS TALK? ▸ Intro to iOS development
30. WHAT ARE WE GOING TO ACHIEVE IN THIS TALK? ▸ Intro to iOS development ▸ Xcode
31. WHAT ARE WE GOING TO ACHIEVE IN THIS TALK? ▸ Intro to iOS development ▸ Xcode ▸ Swift
32. WHAT ARE WE GOING TO ACHIEVE IN THIS TALK? ▸ Intro to iOS development ▸ Xcode ▸ Swift ▸ UI design with Storyboards
33. 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
34. LET'S GET STARTED!
35. LANGUAGES & TOOLS ANDROID IOS Android Studio Xcode Kotlin Swift Java Objective-C
36. ANDROID IOS XML Layout Storyboard Activity/Fragment/ CustomView UIViewController BottomNavigationBar TabBarController RecyclerView with GridLayoutManager UICollectionView ImageView UIImageView TextView UILabel
38. THERE'S A TON OF DRAG & DROP IN STORYBOARDS
39. 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. } }
40. 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. } }
41. 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. } }
42. 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. } }
43. 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. } }
44. EASY, RIGHT?
45. 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. } }
46. UIKIT?
47. UIKIT? ▸ Cocoa Touch is a framework for developing iOS applications.
48. UIKIT? ▸ Cocoa Touch is a framework for developing iOS applications. ▸ UIKit for UI components (buttons, labels)
49. 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
50. ... it's like the Android SDK and the Support Libraries and the language, all in one...
51. LET'S ADD THE NAVIGATION CONTROLLER AND THE TAB BAR CONTROLLER
53. ... WAIT, DO WE HAVE CONTROLLERS AND VIEWCONTROLLERS? ▸ MVC is the default architectural pattern
54. WHERE IS MY Adapter AND MY ViewHolder? protocol is the equivalent of an interface protocol extensions as Kotlin extensions
55. 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
56. 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
57. 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
58. 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
59. 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 } }
60. 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 } }
61. @IBOUTLET It is a keyword added to a variable declaration. It binds your code variable to a UI element in the storyboard
62. var AND let/val KOTLIN SWIFT MUTABLE? var var Yes val let No
63. @IBACTION It is a keyword added to a method declaration. It binds your code method to a UI action in the storyboard
64. 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 } }
65. 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 } }
66. 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"))
67. 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"))
68. 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"))
69. 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"))
70. STRUCTS
71. STRUCTS ▸ Best intended for storing data properties
72. STRUCTS ▸ Best intended for storing data properties ▸ ... are value type, meaning it's value is copied when assigned or passed
73. 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 } }
74. 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 } }
75. 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 } }
76. 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 } }
77. 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 } }
78. LET'S DO SOMETHING A BIT MORE COMPLEX
79. SONGS
80. SONGS ▸ UITableView with data source and delegate
81. SONGS ▸ UITableView with data source and delegate ▸ UITableViewCell with 3 UILabel
82. SONGS ▸ UITableView with data source and delegate ▸ UITableViewCell with 3 UILabel ▸ Segue to SongDetailsViewController
83. SONG DETAILS
84. SONG DETAILS ▸ Part of stack of UINavigationController
85. SONG DETAILS ▸ Part of stack of UINavigationController ▸ UIImage
86. SONG DETAILS ▸ Part of stack of UINavigationController ▸ UIImage ▸ UILabel
87. SONG DETAILS ▸ Part of stack of UINavigationController ▸ UIImage ▸ UILabel ▸ UIText
88. SONG DETAILS ▸ Part of stack of UINavigationController ▸ UIImage ▸ UILabel ▸ UIText ▸ UIButton
91. 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 } }
92. 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 } }
93. 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 } }
94. 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 } }
95. 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) } }
96. 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 } }
97. 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 } }
98. 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 } }
99. 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 } }
100. 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 } }
101. 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 } }
102. 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) } ... }
103. 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) } ... }
104. 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) } ... }
105. 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) } ... }
106. 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) } } }
107. 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) } } }
108. 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) } } }
109. 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) } } }
110. 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) } } }
111. PROFIT TIME! !"
112. ... well, not really, right?
113. !
114. Let's talk about networking and persistence
115. NETWORKING
116. NETWORKING ▸ URLRequest as the simplest method. Built in.
117. NETWORKING ▸ URLRequest as the simplest method. Built in. ▸ URLSession seems to be the current preferred option. Built in.
118. 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
119. 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
120. 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...
121. 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()
122. 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()
123. 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()
124. 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()
125. PERSISTENCE
126. PERSISTENCE ▸ SQLite supported out of the box
127. PERSISTENCE ▸ SQLite supported out of the box ▸ FMDB or SQLite.swift as wrappers
128. PERSISTENCE ▸ SQLite supported out of the box ▸ FMDB or SQLite.swift as wrappers ▸ ... but not as good as Room
129. PERSISTENCE ▸ SQLite supported out of the box ▸ FMDB or SQLite.swift as wrappers ▸ ... but not as good as Room ▸ Oh yeah! And Core Data
130. CORE DATA
131. CORE DATA ▸ Manage object graphs and object lifecycle, including persistence.
132. CORE DATA ▸ Manage object graphs and object lifecycle, including persistence. ▸ Use Core Data to manage the model layer objects in your application.
133. 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
134. !"
136. Biggest efforts on Multiplatform happening on the networking and persistence layers
137. LEARNING RESOURCES
138. LEARNING RESOURCES ▸ Ray Wenderlich, community supported
139. LEARNING RESOURCES ▸ Ray Wenderlich, community supported ▸ Big Nerd Ranch, world class training!
140. LEARNING RESOURCES ▸ Ray Wenderlich, community supported ▸ Big Nerd Ranch, world class training! ▸ NSHipster by @mattt
141. LEARNING RESOURCES ▸ Ray Wenderlich, community supported ▸ Big Nerd Ranch, world class training! ▸ NSHipster by @mattt ▸ Flight School, also by @mattt
142. ...and finally...
144. Thank you!