෮श0QUJPO4FU 
ؔ੢ϞόΠϧΞϓϦݚڀձ
 

JE4JYFJHIU w ג ͸ͯͳ
ΞϓϦέʔγϣϯΤϯδχΞ
w ۙگ
w י઒Ϗʔϧͱ͍͏ΠϕϯτͰ࣌ؒҿΈଓ͚ ͨΒඓਫ͕ࢭ·Βͳ͘ͳΓ·ͨ͠ 

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0QUJPO
4FU 

໨త w Ϣʔβʔ͕ૢ࡞ՄೳͳॲཧΛࢦఆ͢Δ
w ྫ͑͹
w ಡΜͰ΋͍͍͚Ͳɺॻ͖ࠐΉࣄ͸Ͱ͖ͳ͍ͱ͔
w ฤू͸Ͱ͖Δ͚Ͳɺ৽ن࡞੒͸Ͱ͖ͳ͍ͱ͔ 

&OVNFSBUJPO enum Permission { case read case create case edit case delete } 

&OVNFSBUJPO let permissions: [Permission] = [.read, .create] func read() { guard permissions.contains(.read) else { forbidden() return } showReadViewController() } 

&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) } 

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#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 

#JUXJTF
PQFSBUJPO let permissions: UInt8 = Permission.read | Permission.create func read() { guard (permissions & Permission.read) != 0 else { forbidden() return } showReadViewController() } 

#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 

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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) } 

0QUJPO
4FU let permissions: Permission = [.read, .create] func read() { guard permissions.contains(.read) else { forbidden() return } showReadViewController() } 

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) 

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 

0QUJPO
4FU w ͜ͷϦιʔεʹରͯ͜͠ͷϢʔβʔ͕Մೳͳૢ࡞͸ ͳΜͳͷ͔ let resource: Permission = [.read] let user: Permission = [.read, .create, .edit, .delete] let current: Permission = resource.intersection(user) 

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΍Γ͍ͨ if case Permission.read = userPermission { print("Can read") } 

΍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") } 

d
PQFSBUPS extension Permission { static func ~=(lhs: Permission, rhs: Permission) -> Bool { return rhs.contains(lhs) } } 

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༇շͳ஥ؒͨͪ 

༇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) 

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