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Maintenant, vous regardez: Protocols and Extensions

Protocols and Extensions

Use protocol to declare a protocol.

  1. protocol ExampleProtocol {
  2. var simpleDescription: String { get }
  3. mutating func adjust()
  4. }

Classes, enumerations, and structs can all adopt protocols.

  1. class SimpleClass: ExampleProtocol {
  2. var simpleDescription: String = "A very simple class."
  3. var anotherProperty: Int = 69105
  4. func adjust() {
  5. simpleDescription += " Now 100% adjusted."
  6. }
  7. }
  8. var a = SimpleClass()
  9. a.adjust()
  10. let aDescription = a.simpleDescription
  11.  
  12. struct SimpleStructure: ExampleProtocol {
  13. var simpleDescription: String = "A simple structure"
  14. mutating func adjust() {
  15. simpleDescription += " (adjusted)"
  16. }
  17. }
  18. var b = SimpleStructure()
  19. b.adjust()
  20. let bDescription = b.simpleDescription

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