Mobile Programming Protocol Extension

MobileProgrammingの授業で使うスライドです！

Transcript

1. PROTOCOL EXTENSION
   MOBILE PROGRAMMING JAN 30TH
   

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2. 1. EXTENSION
   

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3. ςΩετ
   EXTENSION?
   ▸ ೚ҙͷClass΍Struct, ProtocolΛจࣈ௨Γ֦ுͰ͖Δݴޠػೳͷࣄ
   ▸ ࣗ෼͕ఆٛͨ͠Class͚ͩͰͳ͘ɺ͢Ͱʹఆٛ͞Ε͍ͯΔClassͳ
   Ͳ΋֦ு͢Δ͜ͱ͕Մೳ(UIViewControllerͱ͔)
   ▸ ͜͜Ͱݴ͏֦ுͱ͸ϝιου΍ϓϩύςΟͷ௥Ճ, Protocolͷ࠾༻
   Λࢦ͢
   ▸ ඇৗʹศརͳػೳͰ͸͋Δ͕અ౓ΛकΒͳ͍֦ு͸ࠇຐज़ͱݺ͹
   ΕڪΕΒΕ͍ͯΔ
   

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4. ςΩετ
   EXTENSION(จ๏)
   extension String {
   }
   Ωʔϫʔυ extension ʹଓ͚ͯ ֦ு͍ͨ͠Class໊Λऔಘ
   

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5. ςΩετ
   EXTENSION(จ๏)
   extension String {
   var length: Int { return self.count }
   }
   Ωʔϫʔυ extension ʹଓ͚ͯ ֦ு͍ͨ͠Class໊Λࢦఆ
   PropertyΛ௥ՃͰ͖Δ͕ Computed Property ͷΈ
   

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6. ςΩετ
   EXTENSION(จ๏)
   extension String {
   var length: Int { return self.count }
   func toInt(with defaultValue: Int) -> Int {
   return Int(self) ?? defaultValue
   }
   }
   Ωʔϫʔυ extension ʹଓ͚ͯ ֦ு͍ͨ͠Class໊Λࢦఆ
   PropertyΛ௥ՃͰ͖Δ͕ Computed Property ͷΈ
   ϝιου͸ClassͳͲͱಉ͡Α͏ʹ௥ՃՄೳ
   

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7. ςΩετ
   EXTENSION(จ๏)
   extension String {
   var length: Int { return self.count }
   func toInt(with defaultValue: Int) -> Int {
   return Int(self) ?? defaultValue
   }
   init(date: Date, format: String) {
   // ௕͘ͳΔͷͰׂѪ
   }
   }
   Ωʔϫʔυ extension ʹଓ͚ͯ ֦ு͍ͨ͠Class໊Λࢦఆ
   PropertyΛ௥ՃͰ͖Δ͕ Computed Property ͷΈ
   ϝιου͸ClassͳͲͱಉ͡Α͏ʹ௥ՃՄೳ
   ΠχγϟϥΠβ΋ClassͳͲͱಉ͡Α͏ʹ௥ՃՄೳ
   

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8. ςΩετ
   EXTENSION(จ๏ͦͷ̎)
   extension UIViewController: UITableViewDataSource {
   func numberOfSections(in tableView: UITableView) -> Int {
   return 0
   }
   // ௕͘ͳΔͷͰׂѪ
   }
   Class໊ʹଓ͚ͯProtocol໊Λࢦఆ
   

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9. 2. PROTOCOL
   EXTENSION
   

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10. ςΩετ
    PROTOCOL EXTENSION?
    ▸ ઌ΄Ͳ࿩ͨ͠ExtensionΛ࢖ͬͯ ProtocolΛ֦ு͢Δࣄ
    ▸ Protocol͸ඇৗʹศརͳػೳͰ͋Δ͕ఆٛ͞ΕͨϝιουΛ
    ࠾༻͢Δͨͼʹ࣮૷͠ͳͯ͘͸͍͚ͳ͍ख͕ؒ͋Δ
    ▸ Protocol ExtensionΛ࢖ͬͯProtocolʹσϑΥϧτͷ࣮૷Λ
    ࣋ͨͤͯखؒΛܰݮ͢Δ͜ͱ͕Ͱ͖Δ
    ▸
    

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11. ςΩετ
    PROTOCOL EXTENSION(จ๏, ఆٛ)
    protocol DismissDelegate {}
    ·ͣ͸ProtocolΛఆٛ͢Δ͕֦ு͍ͨ͠ϝιου͸ͬͪ͜ʹ͸ॻ͔ͳ͍
    

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12. ςΩετ
    PROTOCOL EXTENSION(จ๏, ఆٛ)
    protocol DismissDelegate {}
    extension DismissDelegate {
    }
    ·ͣ͸ProtocolΛఆٛ͢Δ͕֦ு͍ͨ͠ϝιου͸ͬͪ͜ʹ͸ॻ͔ͳ͍
    extension Ωʔϫʔυʹଓ͚ͯProtocol໊Λࢦఆ
    

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13. ςΩετ
    PROTOCOL EXTENSION(จ๏, ఆٛ)
    protocol DismissDelegate {}
    extension DismissDelegate {
    func dismiss(vc: UIViewController) {
    vc.dismiss(animated: true, completion: nil)
    }
    }
    ·ͣ͸ProtocolΛఆٛ͢Δ͕֦ு͍ͨ͠ϝιου͸ͬͪ͜ʹ͸ॻ͔ͳ͍
    extension Ωʔϫʔυʹଓ͚ͯProtocol໊Λࢦఆ
    ֦ு͍ͨ͠ϝιουΛ࣮૷
    

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14. ςΩετ
    PROTOCOL EXTENSION(จ๏, ࠾༻ଆ)
    class ViewController: UIViewController {
    }
    extension ViewController: DismissDelegate {}
    ֦ுͨ͠ProtocolΛ࠾༻ͤ͞Δ͕࣮૷Λॻ͘ඞཁ͕ແ͍ʂʂ
    

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15. ςΩετ
    PROTOCOL EXTENSION(จ๏, ࠾༻ଆ)
    class ViewController: UIViewController {
    @IBAction func dismissAction(_ sender: UIButton) {
    dismiss(vc: self)
    }
    }
    extension ViewController: DismissDelegate {}
    ֦ுͨ͠ProtocolΛ࠾༻ͤ͞Δ͕࣮૷Λॻ͘ඞཁ͕ແ͍ʂʂ
    DismissDelegateͷextensionͷ࣮૷͕ݺ͹ΕΔ
    

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