Swift Class Properties

Swift Class Properties

Store state in class properties. Use static for type properties shared across all instances.

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Stored and Computed

Use var for stored properties and let for constants.

Example

class User {
  var name: String // stored
  var greeting: String { "Hello, \(name)" } // computed
  static var appName = "MyApp" // type property
  init(name: String) { self.name = name }
}

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REMOVE ADS

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Property Observers

Use willSet and didSet to react to changes on stored properties.

Example

class Player {
  var score: Int = 0 {
willSet { print("About to set to \(newValue)") }
didSet { print("Changed from \(oldValue) to \(score)") }
  }
}

let p = Player()
p.score = 10