Mobile Programing Property & Method

Mobile Programming の授業で使うスライドです

Transcript

1. ϓϩύςΟͱϝιου MOBILE PROGRAMMING 11TH NOV
2. લճ·Ͱͷ͋ Β͢͡
3. ςΩετ 2. CLASSͷཁૉ ▸ Classͷதʹ͸༷ʑͳཁૉ͕ଘࡏ͠·͢ class Dog: Animal { let name: String private let kind: String init(name: String, kind: String) { self.name = name self.kind = kind } func selfIntroduction() { print("My name is \(name)") print("I'm \(kind)") print("nice to meet you sir.") } } ܧঝ Property ΞΫηεम০ࢠ initializer(constructor) Method
4. ࠓճ͸ɾɾɾ
5. ςΩετ ͜ͷ΁Μͷཁૉʹ͍͓ͭͯ࿩͠͠·͢ ▸ Classͷதʹ͸༷ʑͳཁૉ͕ଘࡏ͠·͢ class Dog: Animal { let name: String private let kind: String init(name: String, kind: String) { self.name = name self.kind = kind } func selfIntroduction() { print("My name is \(name)") print("I'm \(kind)") print("nice to meet you sir.") } } Property ΞΫηεम০ࢠ Method
6. 1. PROPERTY
7. ςΩετ ϓϩύςΟ(PROPERTY)ͱ͸ʁ ▸ ؆୯ʹ͍͏ͱΫϥεͷதʹఆٛ͞Ε͍ͯΔม਺ͷ͜ͱ ▸ ͦͷΫϥε͕ͲΜͳσʔλΛ͔࣋ͭΛද͢ ▸ ྫ͑͹UILabel ͸ text ͱ͍͏໊લͷϓϩύςΟΛ͍࣋ͬͯΔ ▸ Labelʹදࣔ͢ΔจࣈྻͷσʔλͷͨΊͷϓϩύςΟ ▸ Propertyʹ͸༷ʑͳछྨ͕͋Δ
8. ςΩετ ࣮ࡍͷίʔυ class Pokemon { // Property let name: String let type1: String let type2: String? var ability: [String] // Initializer(Constructor) init(name: String, type1: String, type2: String?, ability: [String]) { self.name = name self.type1 = type1 self.type2 = type2 self.ability = ability } // Method func doAbility(name: String) { print("\(self.name)͸\(name)Λ࢖ͬͨʂ") print("͔͠͠Կ΋ى͜Βͳ͍ʂ") } } ͜ͷ෦෼͕Property
9. 1-1. STORED PROPERTY
10. ςΩετ STORED PROPERTYͱ͸ʁ ▸ ҰൠతͳϓϩύςΟ ▸ ೔ຊޠͰ͸֨ೲܕϓϩύςΟ ▸ σʔλΛΠχγϟϥΠβ΍ΠϯελϯεԽͨ͠ޙʹ୅ೖͯ͠ ࢖͏ ▸ جຊతͳ࢖͍ํ͸ී௨ͷม਺, ఆ਺ͱมΘΒͳ͍ ▸ ఆ਺͸ initializer ͰͷΈ஋ΛଋറՄೳ
11. ςΩετ ࣮ࡍͷίʔυ class Pokemon { // Property let name: String let type1: String let type2: String? var ability: [String] } let slowpoke = Pokemon(name: "Ϡυϯ", type1: "Έͣ", type2: "Τεύʔ", ability: ["ͶΜΓ͖", "ΈͣͰͬΆ͏", "ͳ·͚Δ", "Ͷͬͱ͏"] ) // var Ͱఆٛ͞Ε͍ͯΔͷͰ୅ೖՄೳ slowpoke.ability = ["ͳ·͚Δ", "ྫྷౚϏʔϜ", "ϋΠυϩϙϯϓ", “Ͳ๨Ε”] // let Ͱఆٛ͞Ε͍ͯΔͷͰ͜Ε͸Ͱ͖ͳ͍ slowpoke.name = “Ϡυϥϯ" ͜Ε͸શ෦ Stored Property
12. 1-2. COMPUTED PROPERTY
13. ςΩετ COMPUTED PROPERTYͱ͸ʁ ▸ ͜Ε͸গʑಛघͳϓϩύςΟ ▸ ೔ຊޠͰ͸ܭࢉܕϓϩύςΟͱݺ͹ΕΔ ▸ ඞͣ var Ͱఆٛ͞ΕΔ ▸ จ๏͸ var propertyName: Type { return value } ▸ ֨ೲܕͷϓϩύςΟͱ͸ҧ͍ϓϩύςΟʹΞΫηε͢Δͨͼʹϒ ϩοΫͷதͷॲཧ͕࣮ߦ͞Εͯ஋͕ฦ͞ΕΔ ▸ ࣌ؒͷ͔͔Δॲཧ͸ೖΕͪΌμϝ
14. ͲΜͳ࣌ʹ࢖ ͏͔ʁ
15. ϙέϞϯͷྫ Λߟ͑·͢
16. ςΩετ ϙέϞϯͷྫ ▸ ϙέϞϯਤؑΛ࡞Δ৔߹Λߟ͑·͢ ▸ ϠυϯͷΑ͏ʹೋͭͷλΠϓΛ࣋ͭ ϙέϞϯ͸ ▸ λΠϓ1/λΠϓ2ͱ͍͏ܗͰදࣔ͞ Ε·͢ ▸ ͜ͷจࣈΛදࣔ͢Δࡍʹߦ͏ॲཧ͸ ࣍ͷΑ͏ʹͳΔ͸ͣ
17. ςΩετ ࣮ࡍͷίʔυ class Pokemon { // Property let name: String let type1: String let type2: String? var ability: [String] } let slowpoke = Pokemon(name: "Ϡυϯ", type1: "Έͣ", type2: "Τεύʔ", ability: ["ͶΜΓ͖", "ΈͣͰͬΆ͏", "ͳ·͚Δ", "Ͷͬͱ͏"] ) let type1 = slowpoke.type1 if let type2 = slowpoke.type2 { print("λΠϓ: \(type1)/\(type2)") } else { print("λΠϓ: \(type1)") } ͜Ε͸શ෦ Stored Property
18. COMPUTED PROPERTY Λ࢖͏ͱ
19. ςΩετ ࣮ࡍͷίʔυ class Pokemon { // Property let name: String let type1: String let type2: String? var ability: [String] // Computed Property var typeText: String { if let t2 = type2 { return "λΠϓ: \(type1)/\(t2)" } return "λΠϓ: \(type1)" } } let slowpoke = Pokemon(name: "Ϡυϯ", type1: "Έͣ", type2: "Τεύʔ", ability: ["ͶΜΓ͖", "ΈͣͰͬΆ͏", "ͳ·͚Δ", "Ͷͬͱ͏"] ) print(slowpoke.typeText) ͜Ε͕ Computed Property
20. ςΩετ ࣮ࡍͷίʔυ class Pokemon { // Property let name: String let type1: String let type2: String? var ability: [String] // Computed Property var typeText: String { if let t2 = type2 { return "λΠϓ: \(type1)/\(t2)" } return "λΠϓ: \(type1)" } } let slowpoke = Pokemon(name: "Ϡυϯ", type1: "Έͣ", type2: "Τεύʔ", ability: ["ͶΜΓ͖", "ΈͣͰͬΆ͏", "ͳ·͚Δ", "Ͷͬͱ͏"] ) print(slowpoke.typeText) ͜Ε͕ Computed Property ΞΫηεͷ࢓ํ͸ Stored Propertyͱಉ͡
21. 1-3. LAZY PROPERTY
22. ςΩετ LAZY PROPERTYͱ͸ʁ ▸ ͜Ε΋গʑಛघͳϓϩύςΟ ▸ ೔ຊޠͰ͸஗ԆܕϓϩύςΟͱݺ͹ΕΔ ▸ ͪ͜Β΋ඞͣ var Ͱఆٛ͞ΕΔ ▸ จ๏͸ lazy var propertyName: Type { return value }() ▸ ѻ͍ํ͸΄ͱΜͲ stored property ͱಉ͕ͩ͡ ▸ ࠷ॳʹΞΫηε͞ΕΔ·ͰॳظԽ͕͞Εͳ͍ ▸ ͪ͜Β͸ٯʹ࣌ؒͷ͔͔ΔॲཧΛೖΕΔͨΊʹ࢖͏ ▸ ViewControllerͰΑ͘࢖͍·͢
23. ςΩετ ࣮ࡍͷίʔυ class Pokemon { // Property let name: String let type1: String let type2: String? var ability: [String] lazy var skill: String = { return "͍͔͘" }() } let slowpoke = Pokemon(name: "Ϡυϯ", type1: "Έͣ", type2: "Τεύʔ", ability: ["ͶΜΓ͖", "ΈͣͰͬΆ͏", "ͳ·͚Δ", "Ͷͬͱ͏"] ) print(slowpoke.skill) ͜Ε͕ Lazy Property ΞΫηεͷ࢓ํ͸ Stored Propertyͱಉ͕ͩ͡ ݺ͹ΕΔ·ͰॳظԽ͞Εͳ͍
24. 2 PROPERTY OBSERVING
25. ςΩετ PROPERTY OBSERVINGͱ͸ʁ ▸ ͪ͜Β͸ϓϩύςΟͷछྨͰ͸ͳ͘ϓϩύςΟͷػೳ ▸ Observe͸؂ࢹͱ͍͏ҙຯ ▸ ϓϩύςΟͷมߋΛݕ஌ͯ͠ॲཧΛهड़͢Δ͜ͱ͕Ͱ͖ΔΑ͏ʹͳΔػೳ ▸ ϓϩύςΟͷมߋ௚લʹݺ͹ΕΔ willSet { … } ▸ ϓϩύςΟͷมߋ௚ޙʹݺ͹ΕΔ didSet { … } ▸ ͷ2छྨ ▸ { … } ʹॲཧΛॻ͖ࠐΜͰ͍͘
26. 2. ϝιου
27. ςΩετ ϝιουʁ ▸ Ϋϥε΍ߏ଄ମͳͲʹఆٛ͞Ε͍ͯΔؔ਺ͷ͜ͱ ▸ ओʹΠϯελϯε͕อ͍࣋ͯ͠ΔσʔλΛՃ޻ͨ͠Γมߋ͠ ͨΓ͢Δ ▸ ϝιου͔Β͸ಉ͡Ϋϥεʹఆٛ͞Ε͍ͯΔଞͷϝιου΍ ϓϩύςΟʹΞΫηε͢Δ͜ͱ͕Ͱ͖Δ ▸
28. ςΩετ ࣮ࡍͷίʔυ class Pokemon { // Stored Property let name: String // লུɾɾɾ // Initializer(Constructor) init(name: String, type1: String, type2: String?, ability: [String]) { // লུɾɾɾ } // Method func doAbility(name: String) { print("\(self.name)͸\(name)Λ࢖ͬͨʂ") print("͔͠͠Կ΋ى͜Βͳ͍ʂ") } func getAbility(abilityName: String) { } func forgetAbility(abilityName: String) { } } // ϝιουݺͼग़͠ slowpoke.doAbility(name: “ͳ·͚Δ") ͜Ε͕ϝιουఆٛ ͜Ε͕ϝιουݺͼग़͠
29. 3. ΞΫηεम ০ࢠ
30. ςΩετ ΞΫηεम০ࢠʁ ▸ ӳޠͰ͸ Access Control ▸ ม਺΍ఆ਺ɺΫϥεɺϝιουͳͲʹର͢ΔΞΫηεͷ੍ݶΛ؅ཧͰ͖Δػೳ ▸ ͜ΕʹΑΓΫϥεͷ֎͔Β͸৮ͬͯཉ͘͠ͳ͍ϓϩύςΟ΍ϝιουΛӅ͢͜ͱ͕Ͱ͖ ΔΑ͏ʹͳͬͨΓ ▸ ٯʹϞδϡʔϧͷ֎ʹ·Ͱެ։͢Δ͜ͱ΋Ͱ͖ΔΑ͏ʹͳΔ(ผϓϩδΣΫτ͔Β΋ݟ͑ ΔΑ͏ʹͳΔ) ▸ SwiftͰ͸ΏΔ͍ॱʹ open, public, internal, fileprivate, private ͷޒ͕ͭଘࡏ͢Δ ▸ Ϋϥε΍ϓϩύςΟɺϝιουͷલʹ͚ͭͯ࢖͏ ▸ σϑΥϧτͰ͸ internal
31. ςΩετ ҧ͍·ͱΊ ग़య: https://qiita.com/GATA/items/90341f56a56ff584e756
32. ςΩετ ࣮ࡍͷίʔυ open class Pokemon { // Stored Property let name: String // লུɾɾɾ // Initializer(Constructor) init(name: String, type1: String, type2: String?, ability: [String]) { // লུɾɾɾ } // Method private func doAbility(name: String) { print("\(self.name)͸\(name)Λ࢖ͬͨʂ") print("͔͠͠Կ΋ى͜Βͳ͍ʂ") } func getAbility(abilityName: String) { } func forgetAbility(abilityName: String) { } } // Error! slowpoke.doAbility(name: “ͳ·͚Δ") ݺͼग़ͤͳ͘ͳΔ ͜ͷϝιουΛϓϥΠϕʔτʹ Ϋϥε͸Φʔϓϯʹ(ผϓϩδΣΫτ͔Β΋ݟ͑Δ) Կ΋ఆٛ͠ͳ͍৔߹͸ internal ѻ͍ʹͳΔ