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社区首页 >问答首页 >在纯Swift中声明一个协议@objc和让它符合NSObjectProtocol有什么区别呢？

问在纯Swift中声明一个协议@objc和让它符合NSObjectProtocol有什么区别呢？
EN

Stack Overflow用户
提问于 2016-05-25 16:46:37
回答 2查看 834关注 0票数 8

考虑两个Swift协议：

代码语言：javascript
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@objc protocol SomeProtocol { }

protocol SomeOtherProtocol: NSObjectProtocol { }

声明Swift协议@objc与使其符合NSObjectProtocol之间有什么区别？我知道没有@objc的任何协议都不会连接到Objective，但是这两个声明在一个纯Swift应用程序中有什么区别呢？据我所知，@objc应该通过顶级SwiftObject使SomeProtocol与NSObjectProtocol保持一致。

objective-c
swift
nsobject
objective-c-runtime
swift-protocols
EN

Stack Overflow用户

发布于 2016-05-25 16:58:05

我发现的一个不同之处是，遵循NSObjectProtocol协议将把Objective符号信息加载到编译好的Swift二进制文件中。请参见下面生成的程序集：

代码语言：javascript
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l__PROTOCOL_NSObject:
    .quad   0
    .quad   L___unnamed_2
    .quad   0
    .quad   l__PROTOCOL_INSTANCE_METHODS_NSObject
    .quad   0
    .quad   l__PROTOCOL_INSTANCE_METHODS_OPT_NSObject
    .quad   0
    .quad   l__PROTOCOL_PROPERTIES_NSObject
    .long   80
    .long   0
    .quad   l__PROTOCOL_METHOD_TYPES_NSObject

    .private_extern l_OBJC_LABEL_PROTOCOL_$_NSObject
    .section    __DATA,__objc_protolist,coalesced,no_dead_strip
    .globl  l_OBJC_LABEL_PROTOCOL_$_NSObject
    .weak_definition    l_OBJC_LABEL_PROTOCOL_$_NSObject
    .align  3
l_OBJC_LABEL_PROTOCOL_$_NSObject:
    .quad   l__PROTOCOL_NSObject

    .private_extern l_OBJC_PROTOCOL_REFERENCE_$_NSObject
    .section    __DATA,__objc_protorefs,coalesced,no_dead_strip
    .globl  l_OBJC_PROTOCOL_REFERENCE_$_NSObject
    .weak_definition    l_OBJC_PROTOCOL_REFERENCE_$_NSObject
    .align  3
l_OBJC_PROTOCOL_REFERENCE_$_NSObject:
    .quad   l__PROTOCOL_NSObject

    .section    __DATA,__const
    .align  3
l___unnamed_3:
    .quad   1
    .quad   l__PROTOCOL_NSObject

    .globl  __TMp3obj10MyProtocol
    .align  3
__TMp3obj10MyProtocol:
    .quad   0
    .quad   L___unnamed_1
    .quad   l___unnamed_3
    .quad   0
    .quad   0
    .quad   0
    .quad   0
    .quad   0
    .long   72
    .long   5

# ...

# __swift_FORCE_LOAD_ of linked libraries

__swift_FORCE_LOAD_$_swiftCoreGraphics_$_obj:
    .quad   __swift_FORCE_LOAD_$_swiftCoreGraphics

    .section    __TEXT,__objc_methname,cstring_literals
"L_selector_data(isEqual:)":
    .asciz  "isEqual:"

    .section    __TEXT,__cstring,cstring_literals
L___unnamed_4:
    .asciz  "c24@0:8@16"

L___unnamed_5:
    .asciz  "hash"

L___unnamed_6:
    .asciz  "Tq,N,R"

    .section    __TEXT,__objc_methname,cstring_literals
"L_selector_data(hash)":
    .asciz  "hash"

    .section    __TEXT,__cstring,cstring_literals
L___unnamed_7:
    .asciz  "q16@0:8"

L___unnamed_8:
    .asciz  "superclass"

L___unnamed_9:
    .asciz  "T#,N,R"

    .section    __TEXT,__objc_methname,cstring_literals
"L_selector_data(superclass)":
    .asciz  "superclass"

    .section    __TEXT,__cstring,cstring_literals
L___unnamed_10:
    .asciz  "#16@0:8"

    .section    __TEXT,__objc_methname,cstring_literals
"L_selector_data(class)":
    .asciz  "class"

"L_selector_data(self)":
    .asciz  "self"

    .section    __TEXT,__cstring,cstring_literals
L___unnamed_11:
    .asciz  "@16@0:8"

    .section    __TEXT,__objc_methname,cstring_literals
"L_selector_data(performSelector:)":
    .asciz  "performSelector:"

    .section    __TEXT,__cstring,cstring_literals
L___unnamed_12:
    .asciz  "^@24@0:8:16"

    .section    __TEXT,__objc_methname,cstring_literals
"L_selector_data(performSelector:withObject:)":
    .asciz  "performSelector:withObject:"

    .section    __TEXT,__cstring,cstring_literals
L___unnamed_13:
    .asciz  "^@32@0:8:16@24"

    .section    __TEXT,__objc_methname,cstring_literals
"L_selector_data(performSelector:withObject:withObject:)":
    .asciz  "performSelector:withObject:withObject:"

    .section    __TEXT,__cstring,cstring_literals
    .align  4
L___unnamed_14:
    .asciz  "^@40@0:8:16@24@32"

    .section    __TEXT,__objc_methname,cstring_literals
"L_selector_data(isProxy)":
    .asciz  "isProxy"

    .section    __TEXT,__cstring,cstring_literals
L___unnamed_15:
    .asciz  "c16@0:8"

    .section    __TEXT,__objc_methname,cstring_literals
"L_selector_data(isKindOfClass:)":
    .asciz  "isKindOfClass:"

    .section    __TEXT,__cstring,cstring_literals
L___unnamed_16:
    .asciz  "c24@0:8#16"

    .section    __TEXT,__objc_methname,cstring_literals
"L_selector_data(isMemberOfClass:)":
    .asciz  "isMemberOfClass:"

"L_selector_data(conformsToProtocol:)":
    .asciz  "conformsToProtocol:"

    .section    __TEXT,__cstring,cstring_literals
    .align  4
L___unnamed_17:
    .asciz  "c24@0:8@\"Protocol\"16"

    .section    __TEXT,__objc_methname,cstring_literals
"L_selector_data(respondsToSelector:)":
    .asciz  "respondsToSelector:"

    .section    __TEXT,__cstring,cstring_literals
L___unnamed_18:
    .asciz  "c24@0:8:16"

    .section    __TEXT,__objc_methname,cstring_literals
"L_selector_data(retain)":
    .asciz  "retain"

"L_selector_data(release)":
    .asciz  "release"

    .section    __TEXT,__cstring,cstring_literals
L___unnamed_19:
    .asciz  "v16@0:8"

    .section    __TEXT,__objc_methname,cstring_literals
"L_selector_data(autorelease)":
    .asciz  "autorelease"

"L_selector_data(retainCount)":
    .asciz  "retainCount"

"L_selector_data(zone)":
    .asciz  "zone"

    .section    __TEXT,__cstring,cstring_literals
L___unnamed_20:
    .asciz  "^v16@0:8"

L___unnamed_21:
    .asciz  "description"

    .align  4
L___unnamed_22:
    .asciz  "T@\"NSString\",N,R"

    .section    __TEXT,__objc_methname,cstring_literals
"L_selector_data(description)":
    .asciz  "description"

    .section    __TEXT,__cstring,cstring_literals
    .align  4
L___unnamed_23:
    .asciz  "@\"NSString\"16@0:8"

    .align  4
L___unnamed_24:
    .asciz  "debugDescription"

    .section    __TEXT,__objc_methname,cstring_literals
"L_selector_data(debugDescription)":
    .asciz  "debugDescription"

    .section    __TEXT,__cstring,cstring_literals
L___unnamed_2:
    .asciz  "NSObject"

    .section    __DATA,__objc_const
    .align  3
l__PROTOCOL_INSTANCE_METHODS_NSObject:
    .long   24
    .long   19
    .quad   "L_selector_data(isEqual:)"
    .quad   L___unnamed_4
    .quad   0
    .quad   "L_selector_data(hash)"
    .quad   L___unnamed_7
    .quad   0
    .quad   "L_selector_data(superclass)"
    .quad   L___unnamed_10
    .quad   0
    .quad   "L_selector_data(class)"
    .quad   L___unnamed_10
    .quad   0
    .quad   "L_selector_data(self)"
    .quad   L___unnamed_11
    .quad   0
    .quad   "L_selector_data(performSelector:)"
    .quad   L___unnamed_12
    .quad   0
    .quad   "L_selector_data(performSelector:withObject:)"
    .quad   L___unnamed_13
    .quad   0
    .quad   "L_selector_data(performSelector:withObject:withObject:)"
    .quad   L___unnamed_14
    .quad   0
    .quad   "L_selector_data(isProxy)"
    .quad   L___unnamed_15
    .quad   0
    .quad   "L_selector_data(isKindOfClass:)"
    .quad   L___unnamed_16
    .quad   0
    .quad   "L_selector_data(isMemberOfClass:)"
    .quad   L___unnamed_16
    .quad   0
    .quad   "L_selector_data(conformsToProtocol:)"
    .quad   L___unnamed_4
    .quad   0
    .quad   "L_selector_data(respondsToSelector:)"
    .quad   L___unnamed_18
    .quad   0
    .quad   "L_selector_data(retain)"
    .quad   L___unnamed_11
    .quad   0
    .quad   "L_selector_data(release)"
    .quad   L___unnamed_19
    .quad   0
    .quad   "L_selector_data(autorelease)"
    .quad   L___unnamed_11
    .quad   0
    .quad   "L_selector_data(retainCount)"
    .quad   L___unnamed_7
    .quad   0
    .quad   "L_selector_data(zone)"
    .quad   L___unnamed_20
    .quad   0
    .quad   "L_selector_data(description)"
    .quad   L___unnamed_11
    .quad   0

    .align  3
l__PROTOCOL_INSTANCE_METHODS_OPT_NSObject:
    .long   24
    .long   1
    .quad   "L_selector_data(debugDescription)"
    .quad   L___unnamed_11
    .quad   0

    .align  3
l__PROTOCOL_PROPERTIES_NSObject:
    .long   16
    .long   4
    .quad   L___unnamed_5
    .quad   L___unnamed_6
    .quad   L___unnamed_8
    .quad   L___unnamed_9
    .quad   L___unnamed_21
    .quad   L___unnamed_22
    .quad   L___unnamed_24
    .quad   L___unnamed_22

    .align  3
l__PROTOCOL_METHOD_TYPES_NSObject:
    .quad   L___unnamed_4
    .quad   L___unnamed_7
    .quad   L___unnamed_10
    .quad   L___unnamed_10
    .quad   L___unnamed_11
    .quad   L___unnamed_12
    .quad   L___unnamed_13
    .quad   L___unnamed_14
    .quad   L___unnamed_15
    .quad   L___unnamed_16
    .quad   L___unnamed_16
    .quad   L___unnamed_17
    .quad   L___unnamed_18
    .quad   L___unnamed_11
    .quad   L___unnamed_19
    .quad   L___unnamed_11
    .quad   L___unnamed_7
    .quad   L___unnamed_20
    .quad   L___unnamed_23
    .quad   L___unnamed_23

    .no_dead_strip  __TMp3obj10MyProtocol

当声明协议@objc时，这些符号没有加载，我认为这项工作被转移到Swift模块的目标-C头。

MyApp-Swift.h

代码语言：javascript
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SWIFT_PROTOCOL("_TtP15MyApp12SomeProtocol_")
@protocol SomeProtocol
@end

每个协议这里的生成程序集之间的完全不同。

票数 3
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页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/37443212

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