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Swiftͷas Any / AnyObjectͷ
҉తͳܕมʹ͍ͭͯ
iPhone Dev SapporoษڧձΦϯϥΠϯ Mar, 2022
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ੁݪ ༞
@yusuga_
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let int: Int = 0
print(type(of: int)) // Int
print(type(of: int as AnyObject)) // ԿʹͳΔʁ
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͑1
let int: Int = 0
print(type(of: int)) // Int
print(type(of: int as AnyObject)) // __NSCFNumber
__NSCFNumber
≒ NSNumber
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let string = ""
print(type(of: string)) // String
print(type(of: string as AnyObject)) // ԿʹͳΔʁ
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͑2
let string = ""
print(type(of: string)) // String
print(type(of: string as AnyObject)) // __NSCFConstantString
__NSCFConstantString
≒ NSString
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ͳ͔ͥObjectice-Cܥͷܕʹ
ม͞Ε͍ͯΔͧʂ
!
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͢͜ͱՄೳ
let int: Int = 0
type(of: (int as AnyObject) as! Int) // Int
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struct StructModel {}
let structModel = StructModel()
type(of: structModel) // StructModel
type(of: structModel as AnyObject) // ԿʹͳΔʁ
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͑3
struct StructModel {}
let structModel = StructModel()
type(of: structModel) // StructModel
type(of: structModel as AnyObject) // __SwiftValue
__SwiftValue
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__SwiftValue
!
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ղઆ
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SwiftͱObjective-Cͷܕͷ૬ޓม
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SwiftͱObjective-Cͷܕͷ૬ޓม
• Objective-C and Swift interoperabilityʢ૬ޓӡ༻ੑʣʹΑͬͯɺ
SwiftͱObjective-CͷܕΛ૬ޓʹม͕ߦ͑Δ༷ʹͳ͍ͬͯ
Δɻ
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SwiftͱObjective-Cͷܕͷ૬ޓม
• Objective-C and Swift interoperabilityʢ૬ޓӡ༻ੑʣʹΑͬͯɺ
SwiftͱObjective-CͷܕΛ૬ޓʹม͕ߦ͑Δ༷ʹͳ͍ͬͯ
Δɻ
• มfunc _bridgeAnythingToObjectiveC(_ x: T) ->
AnyObjectͰߦΘΕ͍ͯΔɻ
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public func _bridgeAnythingToObjectiveC(_ x: T) -> AnyObject {
var done = false
var result: AnyObject!
let source: Any = x
if let dynamicSource = _extractDynamicValue(x) {
result = dynamicSource as AnyObjectɹ// ← ʂʂʂ
done = true
}
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if !done, let wrapper = source as? _Unwrappable {
if let value = wrapper._unwrap() {
result = value as AnyObjectɹ// ← ʂʂʂ
} else {
result = _nullPlaceholder
}
done = true
}
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if !done {
if type(of: source) as? AnyClass != nil {
result = unsafeBitCast(x, to: AnyObject.self) // ↓ʂʂʂ
} else if let object = _bridgeToObjectiveCUsingProtocolIfPossible(source) {
result = object
} else {
result = _makeSwiftValue(source) // ← ʂʂʂ
}
}
return result
}
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SwiftͱObjective-Cͷܕͷ૬ޓม
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SwiftͱObjective-Cͷܕͷ૬ޓม
• func _bridgeAnythingToObjectiveC(_ x: T) -> AnyObjectͷத
ͰObjective-Cͷܕʹม__SwiftValueͷϥοϓ͕ߦΘΕͯ
͍Δɻ
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__SwiftValueͱ
// __SwiftValue is an Objective-C class, but we shouldn't interface with it
// directly as such. Keep the type opaque.
#if __OBJC__
@class __SwiftValue;
#else
typedef struct __SwiftValue __SwiftValue;
#endif
swift/stdlib/public/runtime/SwiftValue.h
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__SwiftValueͱ
// __SwiftValue is an Objective-C class, but we shouldn't interface with it
// directly as such. Keep the type opaque.
#if __OBJC__
@class __SwiftValue;
#else
typedef struct __SwiftValue __SwiftValue;
#endif
swift/stdlib/public/runtime/SwiftValue.h
• Objective-Cͷclass
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/* Objective-C */
@interface ObjCModel : NSObject
- (NSString *)test:(id)any;
@end
@implementation ObjCModel
- (NSString *)test:(id)any {
return NSStringFromClass([any class]);
}
@end
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/* Swift */
class ObjCModel : NSObject {
func test(_ any: Any!) -> String!
}
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let objcModel = ObjCModel()
type(of: objcModel) // ObjCModel
objcModel.test(StructModel()) // ԿʹͳΔʁ
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͑4
let objcModel = ObjCModel()
type(of: objcModel) // ObjCModel
objcModel.test(StructModel()) // __SwiftValue
__SwiftValue
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Anyͳͷʹʁ
!
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SwiftͰͷas Anyͷڍಈ
let structModel = StructModel()
type(of: structModel as Any) // StructModel
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SwiftͰͷidܕͷѻ͍
Objective-C Swift 2 Swift 3
id AnyObject Any
NSArray * [AnyObject] [Any]
NSDictionary * [NSObject: AnyObject] [AnyHashable: Any]
NSSet * Set Set
Ҿ༻ݩ: Objective-C id as Swift Any 25
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SwiftͰͷidܕͷѻ͍
Objective-C Swift 2 Swift 3
id AnyObject Any
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SwiftͰͷidܕͷѻ͍
Objective-C Swift 2 Swift 3
id AnyObject Any
• Swift 2Ͱ idܕAnyObjectܕͱͯ͠ѻΘΕ͍ͯͨɻ
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SwiftͰͷidܕͷѻ͍
Objective-C Swift 2 Swift 3
id AnyObject Any
• Swift 2Ͱ idܕAnyObjectܕͱͯ͠ѻΘΕ͍ͯͨɻ
• ͨͩ͠ɺAnyObjectͩͱSwiftͷstructenum͕ͤͳ͍ෆ߹
͕͋ͬͨͨΊɺSwift 3͔ΒAnyܕʹมΘͬͨɻ
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SwiftͰͷidܕͷѻ͍
Objective-C Swift 2 Swift 3
id AnyObject Any
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SwiftͰͷidܕͷѻ͍
Objective-C Swift 2 Swift 3
id AnyObject Any
• ͭ·ΓObjective-CͰݩʑAnyObjectʢࢀরܕʣ͔͠ఆͯ͠
͍ͳ͔͕ͬͨɺSwiftͷܕʢstruct, enumʣΛͤΔΑ͏ʹ͢
ΔͨΊʹAnyܕʹมߋ͞Εɺ෦ͰରԠ͢Δclassܕʹม·ͨ
ϥοϓ͢Δ͜ͱʹͳͬͨɻ
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SwiftͰͷidܕͷѻ͍
Objective-C Swift 2 Swift 3
id AnyObject Any
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SwiftͰͷidܕͷѻ͍
Objective-C Swift 2 Swift 3
id AnyObject Any
• Objective-CͷAnyܕʹΛ͢ͱ as AnyObject ͱಉ͘͡ func
_bridgeAnythingToObjectiveC(_ x: T) -> AnyObjectʹΑΔܕม
͕ߦΘΕΔ͜ͱʹͳΔɻ
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࣮ࡍʹૺ۰ͨ͠
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࣮ࡍʹૺ۰ͨ͠
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࣮ࡍʹૺ۰ͨ͠
• Objective-CͰ࣮͞ΕͨAnyܕΛҾʹ͍࣋ͬͯΔؔʹର͠
ͯSwiftͷStructΛͨ͠ΒɺಉҰͷΠϯελϯεΛ͍ͯ͠Δ
ͷʹObjective-CଆͰຖճҟͳΔΠϯελϯε͕͞Ε͍ͯΔ
ͱ͍͏ఆʹͳͬͯ͠·ͬͨɻ
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࣮ࡍʹૺ۰ͨ͠
• Objective-CͰ࣮͞ΕͨAnyܕΛҾʹ͍࣋ͬͯΔؔʹର͠
ͯSwiftͷStructΛͨ͠ΒɺಉҰͷΠϯελϯεΛ͍ͯ͠Δ
ͷʹObjective-CଆͰຖճҟͳΔΠϯελϯε͕͞Ε͍ͯΔ
ͱ͍͏ఆʹͳͬͯ͠·ͬͨɻ
• ཧ༝ɺຖճ৽͍͠__SwiftValueʹϥοϓ͞Εͯ͞ΕΔͨ
Ίɻ
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࣮ࡍʹૺ۰ͨ͠
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࣮ࡍʹૺ۰ͨ͠
• ྫ͑ɺؔͰΠϯελϯεͷಉఆΛͨ͠ϩδοΫ͕࣮
͞Ε͍ͯΔ࣌ʹɺݺͼग़͠ݩಉҰͷstructΛ͍ͯ͠Δͭ
ΓͰɺؔͰҟͳΔΠϯελϯεͱఆ͞Εͯ͠·͏ͷ
Ͱҙਤͨ͠ڍಈʹͳΒͳ͘ͳΔɻ
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Πϯελϯε͕ҟͳΔ͜ͱΛݕূ
@frozen struct ObjectIdentifier
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Πϯελϯε͕ҟͳΔ͜ͱΛݕূ
@frozen struct ObjectIdentifier
• ObjectIdentifierΛͬͯɺੜ͞ΕͨΠϯελϯεͷҰҙͷID
Λग़ͯ͠ΈΔͱɺಉҰͷstructͷͣͳͷʹ as AnyObject ͷ
ʹҧ͏IDʹͳΔ͜ͱ͕֬ೝͰ͖Δɻ
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Πϯελϯε͕ҟͳΔ͜ͱΛݕূ
struct StructModel {}
let structModel = StructModel()
Timer.scheduledTimer(
withTimeInterval: 1,
repeats: true
) { _ in // 1ඵ͝ͱʹΫϩʔδϟ͕࣮ߦ͞ΕΔ
print("struct", ObjectIdentifier(structModel as AnyObject))
}
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/*
ग़ྗ͞ΕΔϩά
struct ObjectIdentifier(0x00006000005749c0)
struct ObjectIdentifier(0x000060000055ef80)
struct ObjectIdentifier(0x00006000005557c0)
struct ObjectIdentifier(0x000060000055dba0)
struct ObjectIdentifier(0x000060000055ef80)
struct ObjectIdentifier(0x00006000005557c0)
*/
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/*
ग़ྗ͞ΕΔϩά
struct ObjectIdentifier(0x00006000005749c0)
struct ObjectIdentifier(0x000060000055ef80)
struct ObjectIdentifier(0x00006000005557c0) // ಉ͡IDʂʂʂ
struct ObjectIdentifier(0x000060000055dba0)
struct ObjectIdentifier(0x000060000055ef80)
struct ObjectIdentifier(0x00006000005557c0) // ಉ͡IDʂʂʂ
*/
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ObjectIdentifierɺղ์͞ΕͨաڈͷΠϯελϯεͱಉ
͡IDΛฦ͢͜ͱ͕͋Δ
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ObjectIdentifierɺղ์͞ΕͨաڈͷΠϯελϯεͱಉ
͡IDΛฦ͢͜ͱ͕͋Δ
• ͜Εͨ·ͨ·ಉ͡ϝϞϦྖҬ͕͍·Θ͞Εͨͱਪ͞Ε
Δɻ
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ObjectIdentifierɺղ์͞ΕͨաڈͷΠϯελϯεͱಉ
͡IDΛฦ͢͜ͱ͕͋Δ
• ͜Εͨ·ͨ·ಉ͡ϝϞϦྖҬ͕͍·Θ͞Εͨͱਪ͞Ε
Δɻ
• ObjectIdentifierͷ༷తʹੜଘதͷΠϯελϯεͷൺֱ
ʢcomparisons during the lifetime of the instance.ʣΛఆͯ͠
͍ΔIDͳͷͰɺ͢Ͱʹղ์͞ΕͨΠϯελϯεͱಉ͡IDʹͳͬ
ͯ͠·͏Մೳੑ͋ΔͱࢥΘΕΔɻ
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ObjectIdentifier͕ಉ͡IDΛฦ͢͜ͱ͕͋Δ
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ObjectIdentifier͕ಉ͡IDΛฦ͢͜ͱ͕͋Δ
• ͜ͷڍಈ͕͋ͬͨͨΊɺ֘ͷObjectivce-Cͷ͕ؔҙਤ௨Γ
ʹಈ͍ͨΓಈ͔ͳ͔ͬͨΓͯ͠ௐ͕ࠪߤͨ͠ɻ
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ະղܾͳٙ
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ະղܾͳٙ
• AnyObjectͬͯͳΜͩΖ͏ʁ
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ະղܾͳٙ
• AnyObjectͬͯͳΜͩΖ͏ʁ
• υΩϡϝϯτతʹͯ͢ͷΫϥε͕҉తʹ४ڌ͢Δ
protocolͱهࡌ͞ΕͯΔ͕ɺఆٛΛݟΔͱ typealias
AnyObject ʹͳ͍ͬͯΔɻ
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ະղܾͳٙ
• AnyObjectͬͯͳΜͩΖ͏ʁ
• υΩϡϝϯτతʹͯ͢ͷΫϥε͕҉తʹ४ڌ͢Δ
protocolͱهࡌ͞ΕͯΔ͕ɺఆٛΛݟΔͱ typealias
AnyObject ʹͳ͍ͬͯΔɻ
• ݕࡧ͢Δͱtypealias AnyObject = Builtin.AnyObject͕ώοτ͢
Δɻ
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͝੩ௌ͋Γ͕ͱ͏
͍͟͝·ͨ͠ʂ
QRίʔυ: Swiftͷas Any / AnyObjectͷ҉తͳܕมʹ͍ͭͯ 39