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1 | 1 | #MVVM Pattern |
2 | 2 |
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| 3 | +```Model``` - ```View``` - ```ViewModel``` |
| 4 | + |
| 5 | + |
| 6 | +```View``` <-> ```Controller``` <-> ```ViewModel``` <-> ```Model``` |
| 7 | + |
| 8 | + |
| 9 | +###Person Class |
| 10 | +```swift |
| 11 | +class Person { |
| 12 | + var firstName: String? |
| 13 | + var lastName: String? |
| 14 | + var birthDate: Date? |
| 15 | + |
| 16 | + init(firstName: String, lastName: String, salutation: String, birthDate: Date) { |
| 17 | + self.firstName = firstName |
| 18 | + self.lastName = lastName |
| 19 | + self.birthDate = birthDate |
| 20 | + } |
| 21 | +} |
| 22 | +``` |
| 23 | + |
| 24 | +### In ViewController |
| 25 | + |
| 26 | +- MVC |
| 27 | +```swift |
| 28 | +override func viewDidLoad() { |
| 29 | + super.viewDidLoad() |
| 30 | + |
| 31 | + //This is MVC Pattern |
| 32 | + nameLabel.text = "\((person?.firstName)!) \((person?.lastName)!)" |
| 33 | + let dateFormatter = DateFormatter() |
| 34 | + dateFormatter.dateFormat = "EEEE MMMM d, yyyy" |
| 35 | + birthDateLabel.text = dateFormatter.string(from: (person?.birthDate)!) |
| 36 | + } |
| 37 | +``` |
| 38 | +- The presentation logic is in a view controller. |
| 39 | + |
| 40 | +###Person View Model Class |
| 41 | +```swift |
| 42 | +class PersonViewModel { |
| 43 | + private var person: Person |
| 44 | + |
| 45 | + var firstNameText: String? { |
| 46 | + return person.firstName |
| 47 | + } |
| 48 | + |
| 49 | + var lastNameText: String? { |
| 50 | + return person.lastName |
| 51 | + } |
| 52 | + |
| 53 | + var fullNameText: String? { |
| 54 | + return "\(person.firstName!) \(person.lastName!)" |
| 55 | + } |
| 56 | + |
| 57 | + var birthDateText: String? { |
| 58 | + let dateFormatter = DateFormatter() |
| 59 | + dateFormatter.dateFormat = "EEEE MMMM d, yyyy" |
| 60 | + return dateFormatter.string(from: person.birthDate!) |
| 61 | + } |
| 62 | + |
| 63 | + init(person: Person) { |
| 64 | + self.person = person |
| 65 | + } |
| 66 | +} |
| 67 | +``` |
| 68 | +- The presentation logic is in a view model. |
| 69 | + |
| 70 | +### In View controller |
| 71 | +- MVVM |
| 72 | +```swift |
| 73 | +override func viewDidLoad() { |
| 74 | + super.viewDidLoad() |
| 75 | + |
| 76 | + //This is MVVM Pattern |
| 77 | + nameLabel.text = personViewModel?.fullNameText |
| 78 | + birthDateLabel.text = personViewModel?.birthDateText |
| 79 | + } |
| 80 | +``` |
| 81 | +- ```viewDidLoad``` method is now very lightweight. |
3 | 82 |
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4 | 83 |
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5 | 84 | ###Ref |
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