Model definition with @Model in iOS Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a model named User using @Model.

iOS Swift

import SwiftData

@[1] class User {
  var name: String
  init(name: String) {
    self.name = name
  }
}

Drag options to blanks, or click blank then click option'

AModel

BObservableObject

CState

DView

Attempts:

3 left

💡 Hint

Common Mistakes

Using @ObservableObject instead of @Model

Forgetting the '@' symbol

Using @State which is for UI state, not models

The @Model attribute is used to define a data model class in SwiftData.

2fill in blank

medium

Complete the code to add an integer property 'age' to the User model.

iOS Swift

@Model class User {
  var name: String
  var [1]: Int
  init(name: String, age: Int) {
    self.name = name
    self.age = age
  }
}

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Aage

Bscore

Cweight

Dheight

Attempts:

3 left

💡 Hint

Common Mistakes

Using a property name that doesn't match the initializer

Using a wrong data type

The property 'age' is added as an Int to the User model.

3fill in blank

hard

Fix the error in the model by completing the missing keyword to make the 'id' property unique.

iOS Swift

@Model class User {
  @[1] var id: UUID = UUID()
  var name: String
  init(name: String) {
    self.name = name
  }
}

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AUnique

BAttribute(.unique)

CAttribute

DID

Attempts:

3 left

💡 Hint

Common Mistakes

Using '@ID' which is not a valid attribute

Forgetting to specify uniqueness

The '@Attribute(.unique)' marks the 'id' property as unique in the model.

4fill in blank

hard

Fill both blanks to define a model with a default value for 'isActive' property.

iOS Swift

@Model class User {
  var name: String
  var [1]: Bool = [2]
  init(name: String, isActive: Bool = true) {
    self.name = name
    self.isActive = isActive
  }
}

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AisActive

BisEnabled

Ctrue

Dfalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different property name than the initializer

Setting default value to false instead of true

The property 'isActive' is a Bool with a default value true.

5fill in blank

hard

Fill all three blanks to define a model with a computed property 'displayName' that returns the uppercase name.

iOS Swift

@Model class User {
  var name: String
  var age: Int
  var [1]: String {
    return [2].[3]()
  }
  init(name: String, age: Int) {
    self.name = name
    self.age = age
  }
}

Drag options to blanks, or click blank then click option'

AdisplayName

Bname

Cuppercased

Dage

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'age' instead of 'name' for uppercase conversion

Misspelling 'uppercased' method

Using wrong computed property name

The computed property 'displayName' returns the uppercase version of 'name' using 'uppercased()'.