復習OptionSet

Transcript

1. ෮श0QUJPO4FU 
   ؔ੢ϞόΠϧΞϓϦݚڀձ
   
2. JE4JYFJHIU w ג ͸ͯͳ
   ΞϓϦέʔγϣϯΤϯδχΞ
   w ۙگ
   w י઒Ϗʔϧͱ͍͏ΠϕϯτͰ࣌ؒҿΈଓ͚ ͨΒඓਫ͕ࢭ·Βͳ͘ͳΓ·ͨ͠
4. 0QUJPO
   4FU
5. ໨త w Ϣʔβʔ͕ૢ࡞ՄೳͳॲཧΛࢦఆ͢Δ
   w ྫ͑͹
   w ಡΜͰ΋͍͍͚Ͳɺॻ͖ࠐΉࣄ͸Ͱ͖ͳ͍ͱ͔
   w ฤू͸Ͱ͖Δ͚Ͳɺ৽ن࡞੒͸Ͱ͖ͳ͍ͱ͔
6. &OVNFSBUJPO enum Permission { case read case create case edit case delete }
7. &OVNFSBUJPO let permissions: [Permission] = [.read, .create] func read() { guard permissions.contains(.read) else { forbidden() return } showReadViewController() }
8. &OVNFSBUJPO w ϦιʔεͷύʔϛογϣϯͱϢʔβʔͷݖݶ
   w ͜ͷϦιʔεʹରͯ͜͠ͷϢʔβʔ͕Մೳͳૢ࡞͸ ͳΜͳͷ͔
   w ͞Βʹάϧʔϓຖʹݖݶ͕͋ͬͨΓ͢Δͱʜ let resourcePermissions: [Permission] = [.read] let userPermissions: [Permission] = [.read, .create, .edit, .delete] resourcePermissions.filter { permission in return userPermissions.contains(permission) }
10. #JUXJTF
    PQFSBUJPO // _ _ _ _ delete edit create read // 0 0 0 0 1 1 1 1 struct Permission { static let read: UInt8 = 0b00000001 static let create: UInt8 = 0b00000010 static let edit: UInt8 = 0b00000100 static let delete: UInt8 = 0b00001000 } 6*OUʹ໊લ͚ͭΔͱྑͦ͞͏ʜ
11. #JUXJTF
    PQFSBUJPO let permissions: UInt8 = Permission.read | Permission.create func read() { guard (permissions & Permission.read) != 0 else { forbidden() return } showReadViewController() }
12. #JUXJTF
    PQFSBUJPO w ͜ͷϦιʔεʹରͯ͜͠ͷϢʔβʔ͕Մೳͳૢ࡞͸ ͳΜͳͷ͔ let resource: UInt8 = Permission.read let user: UInt8 = Permission.read | Permission.create | Permission.edit | Permission.delete let currentPermission = resource & user
14. 0QUJPO
    4FU struct Permission: OptionSet { let rawValue: UInt8 static let read = Permission(rawValue: 1 << 0) static let create = Permission(rawValue: 1 << 1) static let edit = Permission(rawValue: 1 << 2) static let delete = Permission(rawValue: 1 << 3) }
15. 0QUJPO
    4FU let permissions: Permission = [.read, .create] func read() { guard permissions.contains(.read) else { forbidden() return } showReadViewController() }
16. 4FU
    "MHFCSB func contains(Self) func insert(Self) func update(with: Self) func remove(Self) func union(Self) func intersection(Self) func symmetricDifference(Self) func formUnion(Self) func formIntersection(Self) func formSymmetricDifference(Self)
17. 4FU
    "MHFCSB let p: Permission = [.read, .create, .edit] let o: Permission = [.edit, .delete] p //=> 0111 o //=> 1100 p.union(o) //=> 1111 p.intersection(o) //=> 0100 p.symmetricDifference(o) //=> 1011
18. 0QUJPO
    4FU w ͜ͷϦιʔεʹରͯ͜͠ͷϢʔβʔ͕Մೳͳૢ࡞͸ ͳΜͳͷ͔ let resource: Permission = [.read] let user: Permission = [.read, .create, .edit, .delete] let current: Permission = resource.intersection(user)
20. ΍Γ͍ͨ if case Permission.read = userPermission { print("Can read") }
21. ΍Γ͍ͨ switch userPermission { case Permission.read: print("Can Read") fallthrough case Permission.create: print("Can Create") fallthrough case Permission.edit: print("Can edit") fallthrough case Permission.delete: print("Can delete") }
22. d
    PQFSBUPS extension Permission { static func ~=(lhs: Permission, rhs: Permission) -> Bool { return rhs.contains(lhs) } }
24. ༇շͳ஥ؒͨͪ
25. ༇շͳ஥ؒͨͪ w 6*$POUSPM4UBUF
    w OPSNBM
    w EJTBCMFE
    w FUDʜ button.setTitle("དྷ೥΋", for: .normal) button.setTitle("ؔϞό", for: [.highlighted, .selected]) button.setTitle("ΑΖ͘͠", for: .disabled)
26. Α͍͓೥Λ