{"id":109,"date":"2019-04-23T13:52:22","date_gmt":"2019-04-23T05:52:22","guid":{"rendered":"https:\/\/www.hlzhy.com\/?p=109"},"modified":"2019-07-05T12:47:51","modified_gmt":"2019-07-05T04:47:51","slug":"109","status":"publish","type":"post","link":"https:\/\/www.hlzhy.com\/?p=109","title":{"rendered":"iOS \u9762\u5411\u5207\u9762(AOP)\u7f16\u7a0b \u2014\u2014 Aspects & BlockHook"},"content":{"rendered":"\n
\"\"<\/figure><\/div>\n\n\n\n

\u524d\u8a00\uff1a<\/h1>\n\n\n\n

Aspect Oriented Programming (AOP\uff0c\u9762\u5411\u5207\u9762\u7f16\u7a0b) \u5728 Objective-C \u793e\u533a\u5185\u6ca1\u6709\u90a3\u4e48\u6709\u540d\uff0c\u4f46\u662f AOP \u5728\u8fd0\u884c\u65f6\u53ef\u4ee5\u6709\u5de8\u5927\u5a01\u529b\u3002 \u4f46\u662f\u56e0\u4e3a\u6ca1\u6709\u4e8b\u5b9e\u4e0a\u7684\u6807\u51c6\uff0cApple \u4e5f\u6ca1\u6709\u5f00\u7bb1\u5373\u7528\u7684\u63d0\u4f9b\uff0c\u4e5f\u663e\u5f97\u4e0d\u91cd\u8981\uff0c\u5f00\u53d1\u8005\u90fd\u4e0d\u600e\u4e48\u8003\u8651\u5b83\u3002<\/p><\/blockquote>\n\n\n\n

\u2014\u2014 \u5f15\u7528\u81ea\u7985\u4e0e Objective-C \u7f16\u7a0b\u827a\u672f<\/a><\/p>\n\n\n\n

\u4f46\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\u6709\u65f6\u9700\u8981\u96c6\u6210\u7edf\u8ba1SDK<\/em>\uff0c\u6bd4\u5982 Google Analytics, Flurry, MatomoTracker, \u7b49\u7b49\u3002\u4e00\u822c\u60c5\u51b5\u4e0b\u662f\u76f4\u63a5\u5c06\u7edf\u8ba1\u4ee3\u7801\u5199\u5230\u5bf9\u5e94\u7684\u5730\u65b9\uff0c\u6bd4\u5982\u9700\u8981\u7edf\u8ba1\u67d0\u4e2a\u754c\u9762\u7684\u5c55\u793a\u6b21\u6570\u4f1a\u5c06\u4ee3\u7801\u5199\u5728viewDidAppear:<\/code>\u65b9\u6cd5\u5185\uff0c\u8fd9\u5c31\u9020\u6210\u4e86\u5f88\u5927\u7684\u5165\u4fb5\u6027\uff0c\u5e76\u4e14view controller\u91cc\u7684\u4ee3\u7801\u5c06\u53d8\u7cdf\u7cd5\u8d77\u6765\u3002\u8fd9\u65f6\u5019\u5c31\u9700\u8981\u901a\u8fc7\u4f7f\u7528AOP<\/strong>\u5c06\u7edf\u8ba1\u4ee3\u7801\u5355\u72ec\u5206\u79bb\u51fa\u6765\uff0c\u8fd9\u6837view controller\u4e0d\u4f1a\u88ab\u5176\u5b83\u4ee3\u7801\u6c61\u67d3\uff0c\u5e76\u4e14\u5355\u72ec\u5206\u79bb\u51fa\u6765\u4ee5\u540e\u6269\u5c55\u6216\u8005\u66f4\u6362\u5176\u5b83\u7edf\u8ba1SDK\u4f1a\u65b9\u4fbf\u5f88\u591a\u3002<\/p>\n\n\n\n

\u5728\u5bf9\u7c7b\u7684\u7279\u70b9\u65b9\u6cd5\u8fdb\u884c\u5207\u9762\u53ef\u4ee5\u4f7f\u7528Aspects<\/strong><\/a>\uff0c\u4f46\u662f\u5728\u4e00\u4e9b\u7279\u6b8a\u60c5\u51b5\u4e0b\u7edf\u8ba1\u4ee3\u7801\u9700\u8981\u5199\u5728block\u7684\u56de\u8c03\u5185\uff0c\u8fd9\u65f6\u5c31\u9700\u8981\u7528\u4e0aBlockHook<\/strong><\/a>\uff0c\u6bd4\u5982\u9700\u8981\u5728\u67d0\u4e2a\u7f51\u7edc\u8bf7\u6c42\u6210\u529f\u7684block\u56de\u8c03\u5185\uff0c\u8fd9\u65f6\u5019\u5c31\u9700\u8981Aspects<\/strong> & BlockHook<\/strong>\u914d\u5408\u4f7f\u7528\u3002\u672c\u6587\u9488\u5bf9Aspects<\/strong> & BlockHook<\/strong>\u5c06\u5206\u6210\u4e24\u4e2a\u90e8\u5206\u6765\u8bb2\uff0c\u4e3b\u8981\u8bb2\u5982\u4f55\u4f7f\u7528\u548c\u4f7f\u7528\u4e2d\u9047\u5230\u7684\u5751\u3002<\/p>\n\n\n\n

Aspects\uff1a<\/h3>\n\n\n\n

Aspects<\/strong><\/a>\u4e00\u4e2a\u57fa\u4e8eruntime\u7684\u8f7b\u91cf\u7ea7AOP\u5f00\u6e90\u6846\u67b6\uff0c\u4f5c\u8005Peter Steinberger<\/a>
\uff0c\u4e3b\u8981\u662f\u5bf9\u65b9\u6cd5\u8fdb\u884cHook\uff0c\u8be5\u6846\u67b6\u7b80\u5355\u6613\u7528\uff0c\u6e90\u7801\u4e0d\u5230\u5343\u884c\u5374\u975e\u5e38\u5065\u5168\uff0c\u8003\u8651\u5230\u4e86\u5f88\u591a\u5173\u4e8eHook\u65b9\u9762\u7684\u5b89\u5168\u95ee\u9898\u3002<\/p>\n\n\n\n

\u57fa\u672c\u7528\u6cd5\uff1a<\/h5>\n\n\n\n

Aspects\u66b4\u9732\u4e86\u4e24\u4e2a\u65b9\u6cd5\uff08\u65b9\u6cd5\u540d\u4e00\u6837\uff09\uff0c\u5206\u522b\u5bf9\u5e94\u7c7b\u65b9\u6cd5\u548c\u5b9e\u4f8b\u65b9\u6cd5\uff0c\u4e0b\u9762\u4e3a\u4f7f\u7528\u793a\u4f8b\uff1a<\/p>\n\n\n\n

SEL selektor = NSSelectorFromString(@\"loginWithAccount:password:block:\");\nClass clazz = objc_getMetaClass(@\"HYLoginNetwork\".UTF8String);\/\/\u7c7b\u65b9\u6cd5\n\/\/Class clazz = NSClassFromString(@\"HYLoginNetwork\");\/\/\u5b9e\u4f8b\u65b9\u6cd5\n[clazz aspect_hookSelector:selektor\n               withOptions:AspectPositionAfter\/\/\u5728Hook\u65b9\u6cd5 \u6267\u884c\u5b8c\u6210\u4e4b\u540e \u6267\u884cusingBlock\u91cc\u7684\u4ee3\u7801\n                usingBlock:^(id<AspectInfo> aspectInfo, NSString *account, NSString *password, id block) {\n                \/\/\u9700\u8981\u6267\u884c\u7684\u4ee3\u7801...\n                }\n                     error:nil];<\/code><\/pre>\n\n\n\n
\u901a\u8fc7\u5b57\u7b26\u4e32\u7684\u65b9\u5f0f\u521b\u5efaselektor<\/code>\u65b9\u6cd5\u540d\u548cclazz<\/code>\u5bf9\u8c61\uff0c\u8fd9\u6837\u53ef\u4ee5\u51cf\u5c11\u8fc7\u591a\u7684\u5f15\u5165\u5934\u6587\u4ef6\uff0c\u8f93\u5165\u9519\u8bef\u7684\u65b9\u6cd5\u540d\u6216\u5bf9\u8c61\u540d\u65f6\u4f1a\u8f93\u51fa\u9519\u8bef\u65e5\u5fd7\u3002\u65b9\u6cd5\u8fd4\u56de\u7684AspectToken<\/code>\u5bf9\u8c61\u53ef\u4ee5\u901a\u8fc7remove<\/code>\u65b9\u6cd5\u53d6\u6d88Hook\u3002AspectOptions<\/code>\u4ee3\u8868\u4f55\u65f6\u6267\u884cusingBlock<\/code>\u7684\u4ee3\u7801\u3002usingBlock<\/code>\u7684\u53c2\u6570\u662f\u52a8\u6001\u53c2\u6570\uff0c\u9664\u4e86\u7b2c\u4e00\u4e2a\u53c2\u6570aspectInfo<\/code>\u662f\u56fa\u5b9a\u7684\u5916\uff0c\u5176\u5b83\u53c2\u6570\u662fHook\u7684\u65b9\u6cd5\u5bf9\u5e94\u7684\u53c2\u6570\uff08\u6309\u987a\u5e8f\u6392\u5217\uff09\u3002<\/p>\n\n\n\n
AspectPositions\uff1a<\/p>\n\n\n\n
typedef NS_OPTIONS(NSUInteger, AspectOptions) {\n    AspectPositionAfter   = 0,            \/\/\/ \u5728\u539f\u59cb\u5b9e\u73b0\u540e\u8c03\u7528\uff08\u9ed8\u8ba4\uff09\n    AspectPositionInstead = 1,            \/\/\/ \u5c06\u66ff\u6362\u539f\u59cb\u5b9e\u73b0\u3002\n    AspectPositionBefore  = 2,            \/\/\/ \u5728\u539f\u59cb\u5b9e\u73b0\u4e4b\u524d\u8c03\u7528\u3002\n    \n    AspectOptionAutomaticRemoval = 1 << 3 \/\/\/ \u6267\u884c\u4e00\u6b21\u540e\u79fb\u9664Hook\n};\n<\/code><\/pre>\n\n\n\n
AspectInfo\uff1a<\/p>\n\n\n\n
\/\/\/ AspectInfo\u534f\u8bae\u662fusingBlock\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u3002\n@protocol AspectInfo <NSObject>\n- (id)instance; \/\/\/ \u5f53\u524dHook\u7684\u5b9e\u4f8b\u3002\n\n- (NSInvocation *)originalInvocation;\/\/\/ \u88ab Hook \u65b9\u6cd5\u7684\u539f\u59cb invocation\n\n- (NSArray *)arguments;\/\/\/ \u88ab Hook \u65b9\u6cd5\u7684\u6240\u6709\u53c2\u6570\u88c5\u7bb1\u3002 \u8fd9\u662f\u61d2\u60f0\u7684\uff08\u61d2\u52a0\u8f7d\u7684\uff09\u3002\n@end\n<\/code><\/pre>\n\n\n\n
\u65b9\u6cd5\u6709\u8fd4\u56de\u503c\uff1f\u83b7\u53d6\u8fd4\u56de\u503c\uff1a<\/p>\n\n\n\n
    id returnValue;\n    [aspectInfo.originalInvocation getReturnValue:&returnValue];\n<\/code><\/pre>\n\n\n\n
BlockHook\uff1a<\/h3>\n\n\n\n
BlockHook<\/strong><\/a>\u662f\u7531\u6768\u8427\u7389<\/a>\u7f16\u5199\u5e76\u5f00\u6e90\u7684\u6846\u67b6\uff0c\u57fa\u4e8e libffi<\/code> \u5b9e\u73b0\u4e86\u5bf9 Objective-C Block \u7684 hook\u3002<\/p>\n\n\n\n
\u57fa\u672c\u7528\u6cd5\uff1a<\/h5>\n\n\n\n
[clazz aspect_hookSelector:selektor\n               withOptions:AspectPositionBefore \/\/\u5f53block\u662f__NSStackBlock__\u7c7b\u578b\u7684\u60c5\u51b5\u4e0b\u8981\u5728\u8fd9\u4e2a\u65b9\u6cd5\u6267\u884c\u524d\uff08AspectPositionBefore\uff09copy\u5230\u5806\u4e0a\n                usingBlock:^(id<AspectInfo> aspectInfo) {\n                        \n                    __unsafe_unretained id block = [self getLastArgument:aspectInfo];\n                    [block block_hookWithMode:BlockHookModeAfter\/\/\u5728block\u6267\u884c\u5b8c\u4e4b\u540e\u8c03\u7528\n                                   usingBlock:^(BHToken *token, NSInteger code){\n                                       dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),\n                                                      ^{\n                                                          \/\/\u9700\u8981\u6267\u884c\u7684\u4ee3\u7801...\n                                                      });\n                                           \n                                   }];\n                        \n                }\n                                       error:nil];<\/code><\/pre>\n\n\n\n
BlockHookMode:<\/p>\n\n\n\n
typedef NS_ENUM(NSUInteger, BlockHookMode) {\n    BlockHookModeAfter,      \/\/\/ \u5728\u539f\u59cb\u5b9e\u73b0\u540e\u8c03\u7528\n    BlockHookModeInstead,    \/\/\/ \u5c06\u66ff\u6362\u539f\u59cb\u5b9e\u73b0\n    BlockHookModeBefore,     \/\/\/ \u5728\u539f\u59cb\u5b9e\u73b0\u4e4b\u524d\u8c03\u7528\n    BlockHookModeDead,       \/\/\/ \u5728block\u9500\u6bc1\u4e4b\u540e\u8c03\u7528\n};\n<\/code><\/pre>\n\n\n\n
BlockHook\u7684API\u662f\u53c2\u7167Aspects\u5199\u7684\uff0c\u6240\u4ee5\u61c2\u5f97Aspects\u7684\u4e00\u770b\u5c31\u61c2\u3002\u548cAspects\u4e00\u6837\uff0c\u65b9\u6cd5\u8fd4\u56de\u7684BHToken<\/code>\u5bf9\u8c61\u53ef\u4ee5\u901a\u8fc7remove<\/code>\u65b9\u6cd5\u53d6\u6d88Hook\u3002BlockHookMode<\/code>\u4ee3\u8868\u4f55\u65f6\u6267\u884cusingBlock<\/code>\u7684\u4ee3\u7801\u3002usingBlock<\/code>\u7684\u53c2\u6570\u662f\u52a8\u6001\u53c2\u6570\uff0c\u9664\u4e86\u7b2c\u4e00\u4e2a\u53c2\u6570BHToken<\/code>\u662f\u56fa\u5b9a\u7684\u5916\uff0c\u5176\u5b83\u53c2\u6570\u662fHook\u7684Block\u5bf9\u5e94\u7684\u53c2\u6570\uff08\u6309\u987a\u5e8f\u6392\u5217\uff09\u3002<\/p>\n\n\n\n
\u4f46\u662f\u9700\u8981\u6ce8\u610f\u7684\u662f<\/strong>\uff0c\u5f53block\u662f__NSStackBlock__<\/code>\u7c7b\u578b\u7684\u60c5\u51b5\u4e0b\u8981\u5728\u8fd9\u4e2a\u65b9\u6cd5\u6267\u884c\u524d\uff08AspectPositionBefore<\/code>\uff09\u8ba9\u7cfb\u7edf\u628aBlock copy<\/code>\uff0c\u5426\u5219Hook\u4e0d\u5230\u8fd9\u4e2aBlock\u3002\u800c\u4e14\u9700\u8981\u8c03\u7528NSInvocation<\/code>\u7684retainArguments<\/code>\u65b9\u6cd5\uff0c\u4e3b\u52a8\u8ba9NSInvocation<\/code>\u628aBlock copy<\/code>\u5230\u5806\u4e0a\uff0c\u5426\u5219\u4eceNSInvocation<\/code>\u83b7\u53d6\u7684__NSStackBlock__<\/code>\u7c7b\u578bblock\u4e0d\u4f1a\u9500\u6bc1\u3002<\/p>\n\n\n\n
-(id)getLastArgument:(id<AspectInfo>)aspectInfo{\n    [aspectInfo.originalInvocation retainArguments];\n    __unsafe_unretained id block;\n    \/\/\u53d6\u6700\u540e\u4e00\u4e2a\u53c2\u6570\uff08\u7f51\u7edc\u8bf7\u6c42\u6210\u529f\u7684blcok\uff09\n    NSInteger index = aspectInfo.originalInvocation.methodSignature.numberOfArguments - 1;\n    [aspectInfo.originalInvocation getArgument:&block atIndex:index];\n    return block;\n}\n<\/code><\/pre>\n\n\n\n
\u53c2\u8003\u8d44\u6599\uff1a<\/h3>\n\n\n\n
\u9762\u5411\u5207\u9762\u7f16\u7a0b\u4e4b Aspects \u6e90\u7801\u89e3\u6790\u53ca\u5e94\u7528<\/a>
\u4ece Aspects \u6e90\u7801\u4e2d\u6211\u5b66\u5230\u4e86\u4ec0\u4e48\uff1f<\/a>
iOS \u5982\u4f55\u5b9e\u73b0Aspect Oriented Programming (\u4e0a)<\/a>
Hook Objective-C Block with Libffi<\/a><\/p>\n\n\n\n
\u5199\u5728\u6700\u540e\uff1a<\/h3>\n\n\n\n
\u539f\u6587\uff1ahttps:\/\/www.hlzhy.com\/?p=109<\/a><\/p>\n\n\n\n
\u5f53\u521d\u4e3a\u4e86\u8ba9BlockHook\u914d\u5408Aspects\u53ef\u6ca1\u5c11\u6298\u817e\u554a\uff0c\u96c6\u6210libffi.a\u95ee\u9898\uff08\u73b0\u5728\u4f5c\u8005\u76f4\u63a5\u628alibffi.a\u548c\u76f8\u5173\u5934\u6587\u4ef6\u96c6\u6210\u5728\u9879\u76ee\u91cc\u4e86\uff09\uff0c__NSStackBlock__<\/code>\u7684\u95ee\u9898\u4e5f\u8ba9\u6211\u56f0\u60d1\u4e86\u597d\u4e45\u3002\u73b0\u5728\u5199\u51fa\u8fd9\u7bc7\u6587\u7ae0\u4e86\u4f3c\u4e4e\u4e5f\u5e76\u4e0d\u662f\u73b0\u8c61\u4e2d\u7684\u90a3\u4e48\u590d\u6742\ud83d\ude05\u3002
\u6700\u540e\uff0c\u5982\u679c\u6b64\u6587\u7ae0\u5bf9\u4f60\u6709\u5e2e\u52a9\uff0c\u5e0c\u671b\u7ed9\u4e2a\u2764\ufe0f\u3002\u6709\u4ec0\u4e48\u95ee\u9898\u6b22\u8fce\u5728\u8bc4\u8bba\u533a\u63a2\u8ba8<\/p>\n","protected":false},"excerpt":{"rendered":"
\u524d\u8a00\uff1a Aspect Oriented Programming (AOP\uff0c\u9762\u5411\u5207\u9762\u7f16\u7a0b) \u5728 Objective-C \u793e\u533a\u5185\u6ca1\u6709\u90a3\u4e48\u6709\u540d\uff0c\u4f46 … \u7ee7\u7eed\u9605\u8bfb iOS \u9762\u5411\u5207\u9762(AOP)\u7f16\u7a0b \u2014\u2014 Aspects & BlockHook<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[11,12,4],"_links":{"self":[{"href":"https:\/\/www.hlzhy.com\/index.php?rest_route=\/wp\/v2\/posts\/109"}],"collection":[{"href":"https:\/\/www.hlzhy.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hlzhy.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hlzhy.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hlzhy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=109"}],"version-history":[{"count":9,"href":"https:\/\/www.hlzhy.com\/index.php?rest_route=\/wp\/v2\/posts\/109\/revisions"}],"predecessor-version":[{"id":134,"href":"https:\/\/www.hlzhy.com\/index.php?rest_route=\/wp\/v2\/posts\/109\/revisions\/134"}],"wp:attachment":[{"href":"https:\/\/www.hlzhy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=109"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hlzhy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=109"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hlzhy.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=109"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}