{"id":4175,"date":"2025-06-03T11:23:45","date_gmt":"2025-06-05T04:18:44","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4175"},"modified":"2025-06-05T11:23:45","modified_gmt":"2025-06-05T04:18:44","slug":"%e5%ad%b8%e7%bf%92swift%e4%b8%ad%e7%9a%84override%e9%97%9c%e9%8d%b5%e5%ad%97","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/swift\/%e5%ad%b8%e7%bf%92swift%e4%b8%ad%e7%9a%84override%e9%97%9c%e9%8d%b5%e5%ad%97\/","title":{"rendered":"\u6df1\u5165\u5b78\u7fd2 Swift \u4e2d\u7684 Override \u95dc\u9375\u5b57\uff1a2025 \u6700\u65b0\u8a9e\u6cd5\u8207\u6700\u4f73\u5be6\u8e10"},"content":{"rendered":"

<\/p>\n

\u6df1\u5165\u5b78\u7fd2 Swift \u4e2d\u7684 Override \u95dc\u9375\u5b57\uff1a2025 \u6700\u65b0\u8a9e\u6cd5\u8207\u6700\u4f73\u5be6\u8e10<\/h1>\n

Swift \u662f\u4e00\u7a2e\u65b0\u8208\u7684\u7a0b\u5f0f\u8a9e\u8a00\uff0c\u5b83\u7684\u8a9e\u6cd5\u7c21\u55ae\u6613\u61c2\uff0c\u4e26\u4e14\u652f\u63f4\u591a\u7a2e\u7279\u6027\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f **Override**\uff08\u8986\u5beb\uff09\u529f\u80fd\u3002\u5728 Swift \u4e2d\uff0c\u5982\u679c\u8981\u8986\u5beb\u7236\u985e\u5225\u7684\u65b9\u6cd5\uff0c\u5c31\u5fc5\u9808\u4f7f\u7528 `’override’` \u95dc\u9375\u5b57\uff0c\u9019\u4e0d\u50c5\u78ba\u4fdd\u4e86\u7a0b\u5f0f\u7684\u6b63\u78ba\u6027\uff0c\u9084\u589e\u5f37\u4e86\u53ef\u8b80\u6027\u3002<\/p>\n

\u4ec0\u9ebc\u662f Overriding Declaration\uff1f<\/h2>\n

**Overriding Declaration** \u662f\u6307\u5728\u5b50\u985e\u5225\u4e2d\u8986\u5beb\u7236\u985e\u5225\u7684\u65b9\u6cd5\uff0c\u4ee5\u6539\u8b8a\u539f\u6709\u7684\u884c\u70ba\u3002\u9019\u7a2e\u6280\u8853\u80fd\u8b93\u958b\u767c\u8005\u5728\u4e0d\u6539\u8b8a\u539f\u6709\u7a0b\u5f0f\u78bc\u7684\u60c5\u6cc1\u4e0b\uff0c\u5c0d\u7a0b\u5f0f\u9032\u884c\u512a\u5316\u548c\u6539\u9032\u3002\u900f\u904e\u8986\u5beb\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u5728\u5b50\u985e\u5225\u4e2d\u63d0\u4f9b\u7279\u5b9a\u7684\u5be6\u73fe\u65b9\u5f0f\uff0c\u5f9e\u800c\u4f7f\u5f97\u7a0b\u5f0f\u66f4\u5177\u5f48\u6027\u548c\u53ef\u64f4\u5c55\u6027\u3002<\/p>\n

\u70ba\u4ec0\u9ebc\u8981\u4f7f\u7528 ‘override’ \u95dc\u9375\u5b57\uff1f<\/h2>\n

\u5728 Swift \u4e2d\uff0c\u4f7f\u7528 `’override’` \u95dc\u9375\u5b57\u4e0d\u50c5\u53ef\u4ee5\u78ba\u4fdd\u7a0b\u5f0f\u7684\u6b63\u78ba\u6027\uff0c\u9084\u80fd\u8b93\u958b\u767c\u8005\u6e05\u695a\u5730\u8b58\u5225\u8a72\u65b9\u6cd5\u662f\u5f9e\u7236\u985e\u5225\u7e7c\u627f\u800c\u4f86\u7684\uff0c\u800c\u4e0d\u662f\u5728\u5b50\u985e\u5225\u4e2d\u91cd\u65b0\u5b9a\u7fa9\u7684\u3002\u6b64\u5916\uff0c\u9019\u6a23\u7684\u505a\u6cd5\u80fd\u8b93\u7a0b\u5f0f\u78bc\u66f4\u52a0\u6e05\u6670\uff0c\u63d0\u5347\u53ef\u8b80\u6027\u548c\u7dad\u8b77\u6027\uff0c\u7279\u5225\u662f\u5728\u5927\u578b\u5c08\u6848\u4e2d\u3002<\/p>\n

\u5982\u4f55\u4f7f\u7528 ‘override’ \u95dc\u9375\u5b57\uff1f<\/h2>\n

\u4f7f\u7528 `’override’` \u95dc\u9375\u5b57\u975e\u5e38\u7c21\u55ae\uff0c\u53ea\u9700\u8981\u5728\u8986\u5beb\u7236\u985e\u5225\u7684\u65b9\u6cd5\u7684\u524d\u9762\u52a0\u4e0a `’override’` \u95dc\u9375\u5b57\u5373\u53ef\u3002\u4ee5\u4e0b\u662f\u7bc4\u4f8b\uff1a<\/p>\n

\nclass Parent {\n    func doSomething() {\n        print(\"Parent doing something\")\n    }\n}\n\nclass Child: Parent {\n    override func doSomething() {\n        print(\"Child doing something different\")\n    }\n}\n\n\/\/ \u4f7f\u7528\u7bc4\u4f8b\nlet childInstance = Child()\nchildInstance.doSomething()  \/\/ \u8f38\u51fa: Child doing something different\n<\/pre>\n
\u5728\u4e0a\u9762\u7684\u7a0b\u5f0f\u78bc\u4e2d\uff0c\u6211\u5011\u5728\u5b50\u985e\u5225\u4e2d\u8986\u5beb\u4e86\u7236\u985e\u5225\u7684\u65b9\u6cd5\uff0c\u4e26\u4e14\u5728\u65b9\u6cd5\u524d\u9762\u52a0\u4e0a\u4e86 `’override’` \u95dc\u9375\u5b57\uff0c\u4ee5\u78ba\u4fdd\u7a0b\u5f0f\u7684\u6b63\u78ba\u6027\u3002\u9019\u6a23\u4e0d\u50c5\u8b93\u5b50\u985e\u5225\u7684\u884c\u70ba\u66f4\u5177\u7279\u8272\uff0c\u9084\u907f\u514d\u4e86\u6f5b\u5728\u7684\u932f\u8aa4\u3002<\/p>\n
\u932f\u8aa4\u6392\u9664<\/h2>\n
\u5728\u4f7f\u7528 `’override’` \u6642\uff0c\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\u4ee5\u907f\u514d\u5e38\u898b\u932f\u8aa4\uff1a
\n1. \u78ba\u4fdd\u7236\u985e\u5225\u7684\u65b9\u6cd5\u662f\u6a19\u8a18\u70ba `open` \u6216 `public`\uff0c\u5426\u5247\u7121\u6cd5\u8986\u5beb\u3002
\n2. \u78ba\u4fdd\u5b50\u985e\u5225\u7684\u65b9\u6cd5\u7c3d\u540d\u5fc5\u9808\u8207\u7236\u985e\u5225\u5b8c\u5168\u5339\u914d\uff0c\u5426\u5247\u6703\u5c0e\u81f4\u7de8\u8b6f\u932f\u8aa4\u3002
\n3. \u5982\u679c\u60f3\u8981\u8b93\u67d0\u500b\u65b9\u6cd5\u5728\u5b50\u985e\u5225\u4e2d\u7121\u6cd5\u88ab\u8986\u5beb\uff0c\u53ef\u4ee5\u4f7f\u7528 `final` \u95dc\u9375\u5b57\u4f86\u4fee\u98fe\u7236\u985e\u5225\u7684\u65b9\u6cd5\u3002<\/p>\n
\u5ef6\u4f38\u61c9\u7528<\/h2>\n
\u9664\u4e86\u57fa\u672c\u7684\u8986\u5beb\uff0cSwift \u7684 `override` \u9084\u53ef\u4ee5\u8207\u5176\u4ed6\u7279\u6027\u7d50\u5408\u4f7f\u7528\uff0c\u4f8b\u5982\uff1a
\n– **\u591a\u578b**\uff1a\u900f\u904e\u8986\u5beb\u4e0d\u540c\u7684\u884c\u70ba\u4f86\u5be6\u73fe\u591a\u578b\uff0c\u5141\u8a31\u7528\u6236\u6839\u64da\u9700\u8981\u8abf\u7528\u4e0d\u540c\u7684\u5be6\u73fe\u3002
\n– **\u5354\u5b9a**\uff1a\u5728\u5be6\u73fe\u5354\u5b9a\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u8986\u5beb\u4f86\u63d0\u4f9b\u4e0d\u540c\u7684\u884c\u70ba\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u5728 Swift \u4e2d\uff0c\u82e5\u8981\u8986\u5beb\u7236\u985e\u5225\u7684\u65b9\u6cd5\uff0c\u5c31\u5fc5\u9808\u4f7f\u7528 `’override’` \u95dc\u9375\u5b57\u3002\u9019\u4e0d\u50c5\u78ba\u4fdd\u4e86\u7a0b\u5f0f\u7684\u6b63\u78ba\u6027\uff0c\u9084\u80fd\u63d0\u9ad8\u7a0b\u5f0f\u78bc\u7684\u53ef\u8b80\u6027\uff0c\u8b93\u958b\u767c\u8005\u66f4\u5bb9\u6613\u7406\u89e3\u548c\u7dad\u8b77\u3002\u638c\u63e1\u9019\u4e00\u6982\u5ff5\u5c0d\u65bc\u6210\u70ba\u4e00\u540d\u512a\u79c0\u7684 Swift \u958b\u767c\u8005\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n
Q&A\uff08\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff09<\/h2>\n
Q1: \u70ba\u4ec0\u9ebc\u5728 Swift \u4e2d\u9700\u8981\u4f7f\u7528 ‘override’ \u95dc\u9375\u5b57\uff1f<\/h3>\n
A1: \u4f7f\u7528 ‘override’ \u95dc\u9375\u5b57\u53ef\u4ee5\u78ba\u4fdd\u65b9\u6cd5\u7684\u6b63\u78ba\u6027\uff0c\u4e26\u4e14\u4f7f\u5f97\u958b\u767c\u8005\u80fd\u5920\u6e05\u695a\u8b58\u5225\u65b9\u6cd5\u7684\u4f86\u6e90\uff0c\u589e\u5f37\u7a0b\u5f0f\u78bc\u7684\u53ef\u8b80\u6027\u3002<\/p>\n
Q2: \u8986\u5beb\u7236\u985e\u5225\u7684\u65b9\u6cd5\u6703\u5f71\u97ff\u5230\u5176\u4ed6\u5b50\u985e\u5225\u55ce\uff1f<\/h3>\n
A2: \u662f\u7684\uff0c\u5982\u679c\u4f60\u5728\u5b50\u985e\u5225\u4e2d\u8986\u5beb\u4e86\u7236\u985e\u5225\u7684\u65b9\u6cd5\uff0c\u9019\u53ef\u80fd\u6703\u5f71\u97ff\u5230\u5176\u4ed6\u5b50\u985e\u5225\u7684\u884c\u70ba\uff0c\u7279\u5225\u662f\u5728\u4f7f\u7528\u591a\u578b\u6642\u3002<\/p>\n
Q3: \u6211\u53ef\u4ee5\u8986\u5beb `final` \u4fee\u98fe\u7684\u65b9\u6cd5\u55ce\uff1f<\/h3>\n
A3: \u4e0d\u53ef\u4ee5\uff0c`final` \u4fee\u98fe\u7684\u65b9\u6cd5\u7121\u6cd5\u88ab\u8986\u5beb\uff0c\u9019\u6a23\u7684\u8a2d\u8a08\u662f\u70ba\u4e86\u9632\u6b62\u5b50\u985e\u5225\u4fee\u6539\u7236\u985e\u5225\u7684\u884c\u70ba\u3002<\/p>\n
—<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6587\u7ae0\u6458\u8981\uff1aSwift\u4e2d\u7684Override\u95dc\u9375\u5b57\u662f\u4e00\u500b\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u8986\u84cb\u7236\u985e\u5225\u4e2d\u7684\u65b9\u6cd5\uff0c\u4ee5\u6539\u8b8a\u5176\u884c\u70ba\u3002\u672c\u6587\u5c07\u8a73\u7d30\u4ecb\u7d39Override\u95dc\u9375\u5b57\u7684\u529f\u80fd\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u793a\u4f8b\u4f86\u89e3\u91cb\u5b83\u7684\u7528\u6cd5\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[174,5],"tags":[173,9],"class_list":["post-4175","post","type-post","status-publish","format-standard","hentry","category-ios","category-swift","tag-ios","tag-swift"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_shortlink":"https:\/\/wp.me\/pcFK27-15l","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4175","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/comments?post=4175"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4175\/revisions"}],"predecessor-version":[{"id":4176,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4175\/revisions\/4176"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=4175"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=4175"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=4175"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}