{"id":4091,"date":"2025-05-28T13:47:56","date_gmt":"2025-06-04T06:06:55","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4091"},"modified":"2025-06-04T13:47:56","modified_gmt":"2025-06-04T06:06:55","slug":"%e4%ba%86%e8%a7%a3swift%e4%b8%ad%e4%b8%8d%e5%8f%af%e8%ae%8a%e5%80%bc%e7%9a%84mutating%e6%88%90%e5%93%a1","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/swift\/%e4%ba%86%e8%a7%a3swift%e4%b8%ad%e4%b8%8d%e5%8f%af%e8%ae%8a%e5%80%bc%e7%9a%84mutating%e6%88%90%e5%93%a1\/","title":{"rendered":"\u6df1\u5165\u89e3\u6790 Swift \u932f\u8aa4\uff1a\u5982\u4f55\u89e3\u6c7a\u300cCannot use mutating member on immutable value\u300d"},"content":{"rendered":"

<\/p>\n

\u6df1\u5165\u89e3\u6790 Swift \u932f\u8aa4\uff1a\u5982\u4f55\u89e3\u6c7a\u300cCannot use mutating member on immutable value\u300d<\/h1>\n

Swift \u662f\u4e00\u7a2e\u529f\u80fd\u5f37\u5927\u7684\u7a0b\u5f0f\u8a9e\u8a00\uff0c\u7121\u8ad6\u4f60\u662f\u65b0\u624b\u9084\u662f\u7d93\u9a57\u8c50\u5bcc\u7684\u958b\u767c\u8005\uff0c\u7e3d\u6703\u5728\u7de8\u5beb\u7a0b\u5f0f\u904e\u7a0b\u4e2d\u9047\u5230\u5404\u7a2e\u932f\u8aa4\u3002\u5176\u4e2d\uff0c\u300cCannot use mutating member on immutable value: ‘X’\u300d\u662f\u4e00\u500b\u76f8\u5c0d\u5e38\u898b\u7684\u932f\u8aa4\u3002\u672c\u6587\u5c07\u70ba\u4f60\u8a73\u7d30\u89e3\u91cb\u9019\u500b\u932f\u8aa4\u7684\u539f\u56e0\uff0c\u4ee5\u53ca\u5982\u4f55\u6709\u6548\u5730\u89e3\u6c7a\u5b83\u3002<\/p>\n

\u4ec0\u9ebc\u662f\u300cCannot use mutating member on immutable value: ‘X’\u300d\uff1f<\/h2>\n

\u9019\u500b\u932f\u8aa4\u4fe1\u606f\u8868\u660e\u4f60\u6b63\u5728\u5617\u8a66\u5c0d\u4e00\u500b\u4e0d\u53ef\u8b8a\u7684\u503c\u4f7f\u7528\u8b8a\u5316\u6210\u54e1\uff08mutating member\uff09\u3002\u5728 Swift \u4e2d\uff0c\u8b8a\u91cf\u5206\u70ba\u53ef\u8b8a\u7684\uff08\u4f7f\u7528 `var` \u5ba3\u544a\uff09\u548c\u4e0d\u53ef\u8b8a\u7684\uff08\u4f7f\u7528 `let` \u5ba3\u544a\uff09\u3002\u53ef\u8b8a\u7684\u503c\u53ef\u4ee5\u5728\u7a0b\u5f0f\u904b\u884c\u6642\u9032\u884c\u4fee\u6539\uff0c\u800c\u4e0d\u53ef\u8b8a\u7684\u503c\u5247\u7121\u6cd5\u6539\u8b8a\u3002<\/p>\n

\u7576\u4f60\u5617\u8a66\u5c0d\u4e0d\u53ef\u8b8a\u7684\u503c\u9032\u884c\u4fee\u6539\u6642\uff0cSwift \u6703\u5f15\u767c\u9019\u500b\u932f\u8aa4\uff0c\u63d0\u9192\u4f60\u6240\u4f7f\u7528\u7684\u8b8a\u5316\u6210\u54e1\u4e0d\u9069\u7528\u65bc\u4e0d\u53ef\u8b8a\u7684\u5be6\u4f8b\u3002<\/p>\n

\u5982\u4f55\u89e3\u6c7a\u300cCannot use mutating member on immutable value: ‘X’\u300d\u932f\u8aa4\uff1f<\/h2>\n

\u8981\u89e3\u6c7a\u9019\u500b\u932f\u8aa4\uff0c\u4f60\u9700\u8981\u5c07\u4e0d\u53ef\u8b8a\u7684\u503c\u8f49\u63db\u70ba\u53ef\u8b8a\u7684\u503c\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528 Swift \u7684 `var` \u95dc\u9375\u5b57\u4f86\u5ba3\u544a\u53ef\u8b8a\u7684\u8b8a\u6578\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u505a\u5230\u7684\u793a\u4f8b\uff1a<\/p>\n

\nlet immutableValue = 10 \/\/ \u4e0d\u53ef\u8b8a\u7684\u503c\nvar mutableValue = immutableValue \/\/ \u5c07\u4e0d\u53ef\u8b8a\u7684\u503c\u8ce6\u503c\u7d66\u53ef\u8b8a\u7684\u503c\nmutableValue = 20 \/\/ \u73fe\u5728\u53ef\u4ee5\u5b89\u5168\u4fee\u6539 mutableValue\n<\/pre>\n
\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u9996\u5148\u5ba3\u544a\u4e86\u4e00\u500b\u4e0d\u53ef\u8b8a\u7684\u8b8a\u6578 `immutableValue`\uff0c\u7136\u5f8c\u5c07\u5176\u8ce6\u503c\u7d66\u53ef\u8b8a\u7684\u8b8a\u6578 `mutableValue`\u3002\u63a5\u8457\uff0c\u6211\u5011\u6210\u529f\u5c07 `mutableValue` \u7684\u503c\u66f4\u6539\u70ba 20\uff0c\u800c\u4e0d\u6703\u5f15\u767c\u932f\u8aa4\u3002<\/p>\n
\u5e38\u898b\u5834\u666f\u8207\u6700\u4f73\u5be6\u8e10<\/h2>\n
\u5728 Swift \u7de8\u7a0b\u4e2d\uff0c\u5e38\u5e38\u6703\u4f7f\u7528\u4e0d\u53ef\u8b8a\u7684\u503c\u4f86\u63d0\u9ad8\u4ee3\u78bc\u7684\u5b89\u5168\u6027\u548c\u53ef\u8b80\u6027\u3002\u7136\u800c\uff0c\u7576\u9700\u8981\u5c0d\u96c6\u5408\u9032\u884c\u64cd\u4f5c\u6642\uff0c\u8a18\u5f97\u4f7f\u7528\u53ef\u8b8a\u96c6\u5408\u4f86\u907f\u514d\u6b64\u985e\u932f\u8aa4\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\uff1a<\/p>\n
1. **\u9078\u64c7\u5408\u9069\u7684\u8b8a\u6578\u985e\u578b**\uff1a\u5728\u9700\u8981\u4fee\u6539\u7684\u5834\u666f\u4e2d\u4f7f\u7528 `var`\uff0c\u5728\u4e0d\u9700\u8981\u4fee\u6539\u7684\u5834\u666f\u4e2d\u4f7f\u7528 `let`\u3002
\n2. **\u7d50\u69cb\u8207\u985e\u5225\u7684\u8003\u91cf**\uff1a\u5982\u679c\u4f60\u5728\u4f7f\u7528\u985e\u5225\uff0c\u78ba\u4fdd\u78ba\u4fdd\u5c0d\u53ef\u8b8a\u5c6c\u6027\u7684\u64cd\u4f5c\u4e0d\u6703\u9055\u53cd\u4e0d\u8b8a\u6027\u539f\u5247\u3002
\n3. **\u4f7f\u7528\u51fd\u6578\u5c01\u88dd\u908f\u8f2f**\uff1a\u5c07\u8b8a\u5316\u908f\u8f2f\u5c01\u88dd\u5728\u51fd\u6578\u4e2d\uff0c\u53ef\u4ee5\u6e1b\u5c11\u932f\u8aa4\u7684\u767c\u751f\u6a5f\u6703\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u6df1\u5165\u63a2\u8a0e\u4e86 Swift \u4e2d\u7684\u300cCannot use mutating member on immutable value: ‘X’\u300d\u932f\u8aa4\uff0c\u4e26\u63d0\u4f9b\u4e86\u6709\u6548\u7684\u89e3\u6c7a\u65b9\u6848\u3002\u901a\u904e\u5c07\u4e0d\u53ef\u8b8a\u7684\u503c\u8f49\u63db\u70ba\u53ef\u8b8a\u7684\u503c\uff0c\u4f60\u53ef\u4ee5\u8f15\u9b06\u5730\u89e3\u6c7a\u9019\u500b\u554f\u984c\uff0c\u4e26\u63d0\u5347\u4f60\u7684 Swift \u7de8\u7a0b\u6280\u80fd\u3002<\/p>\n
\u73fe\u5728\uff0c\u4f60\u5df2\u7d93\u638c\u63e1\u4e86\u9019\u4e00\u932f\u8aa4\u7684\u542b\u7fa9\u53ca\u5176\u89e3\u6c7a\u65b9\u6cd5\uff0c\u672a\u4f86\u5728\u7de8\u5beb Swift \u7a0b\u5f0f\u6642\uff0c\u80fd\u5920\u66f4\u52a0\u81ea\u4fe1\u5730\u8655\u7406\u76f8\u4f3c\u7684\u554f\u984c\u3002<\/p>\n
—<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6587\u7ae0\u6458\u8981\uff1a\u672c\u6587\u5c07\u89e3\u91cbSwift\u4e2d\u4e0d\u53ef\u8b8a\u503c\u7684mutating\u6210\u54e1\uff0c\u4ee5\u53ca\u5982\u4f55\u907f\u514d\u51fa\u73fe\u201cCannotusemutatingmemberonimmutablevalue\u201d\u7684\u932f\u8aa4\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-4091","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\/pcFK27-13Z","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4091","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=4091"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4091\/revisions"}],"predecessor-version":[{"id":4092,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4091\/revisions\/4092"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=4091"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=4091"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=4091"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}