{"id":4255,"date":"2025-05-30T13:15:22","date_gmt":"2025-06-04T06:09:21","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4255"},"modified":"2025-06-04T13:15:22","modified_gmt":"2025-06-04T06:09:21","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%a1-5","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%a1-5\/","title":{"rendered":"\u6df1\u5165\u89e3\u6790 Swift \u932f\u8aa4\uff1a\u5982\u4f55\u89e3\u6c7a\u300cCannot use mutating member on immutable value: ‘X’\u300d"},"content":{"rendered":"

<\/p>\n

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

\u5728 Swift \u958b\u767c\u4e2d\uff0c\u9047\u5230\u932f\u8aa4\u662f\u5e38\u6709\u7684\u4e8b\u60c5\u3002\u5176\u4e2d\uff0c\u300cCannot use mutating member on immutable value: ‘X’\u300d\u662f\u4e00\u500b\u7279\u5225\u5e38\u898b\u7684\u932f\u8aa4\u8a0a\u606f\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u6b64\u932f\u8aa4\u7684\u6839\u672c\u539f\u56e0\uff0c\u4e26\u63d0\u4f9b\u6709\u6548\u7684\u89e3\u6c7a\u65b9\u6848\uff0c\u5e6b\u52a9\u60a8\u66f4\u9806\u5229\u5730\u7de8\u5beb Swift \u7a0b\u5f0f\u78bc\u3002<\/p>\n

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

\u7576\u60a8\u5728 Swift \u4e2d\u5617\u8a66\u5c0d\u4e00\u500b\u4e0d\u53ef\u8b8a\u7684\u503c\uff08immutable value\uff09\u4f7f\u7528\u8b8a\u5316\u6210\u54e1\uff08mutating member\uff09\u6642\uff0c\u5c31\u6703\u9047\u5230\u9019\u500b\u932f\u8aa4\u3002\u9019\u610f\u5473\u8457\u60a8\u6b63\u5728\u8a66\u5716\u5c0d\u4e00\u500b\u5728\u5275\u5efa\u5f8c\u7121\u6cd5\u4fee\u6539\u7684\u8b8a\u91cf\u9032\u884c\u8b8a\u66f4\u64cd\u4f5c\u3002<\/p>\n

\u5728 Swift \u4e2d\uff0c\u8b8a\u91cf\u4e3b\u8981\u5206\u70ba\u5169\u985e\uff1a\u53ef\u8b8a\u7684\uff08mutable\uff09\u548c\u4e0d\u53ef\u8b8a\u7684\uff08immutable\uff09\u3002\u53ef\u8b8a\u7684\u8b8a\u91cf\u53ef\u4ee5\u5728\u7a0b\u5f0f\u57f7\u884c\u671f\u9593\u88ab\u4fee\u6539\uff0c\u800c\u4e0d\u53ef\u8b8a\u7684\u8b8a\u91cf\u5247\u4e00\u7d93\u8a2d\u5b9a\u4fbf\u7121\u6cd5\u6539\u52d5\u3002<\/p>\n

\u5982\u679c\u60a8\u8a66\u5716\u5c0d\u4e0d\u53ef\u8b8a\u7684\u8b8a\u91cf\u4f7f\u7528\u8b8a\u5316\u6210\u54e1\uff0cSwift \u5c07\u6703\u62cb\u51fa\u932f\u8aa4\uff0c\u63d0\u793a\u60a8\u300cCannot use mutating member on immutable value: ‘X’\u300d\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\u4e00\u932f\u8aa4\uff0c\u60a8\u9700\u8981\u5c07\u4e0d\u53ef\u8b8a\u7684\u503c\u8f49\u63db\u70ba\u53ef\u8b8a\u7684\u503c\u3002\u4f7f\u7528 Swift \u7684 var<\/code> \u95dc\u9375\u5b57\u53ef\u4ee5\u8f15\u9b06\u5b8c\u6210\u9019\u4e00\u64cd\u4f5c\uff1a<\/p>\n

\nlet x = 10   \/\/ \u4e0d\u53ef\u8b8a\u503c\nvar y = x    \/\/ \u5c07\u4e0d\u53ef\u8b8a\u503c\u8ce6\u503c\u7d66\u53ef\u8b8a\u503c\ny = 20       \/\/ \u73fe\u5728\u53ef\u4ee5\u5c0d y \u9032\u884c\u8b8a\u66f4\n<\/pre>\n
\u5728\u4e0a\u8ff0\u7a0b\u5f0f\u78bc\u4e2d\uff0c\u6211\u5011\u5c07 x<\/code> \u5ba3\u544a\u70ba\u4e0d\u53ef\u8b8a\u7684\uff08let<\/code>\uff09\uff0c\u800c y<\/code> \u5247\u662f\u53ef\u8b8a\u7684\uff08var<\/code\uff09\u3002\u900f\u904e\u5c07 x<\/code> \u7684\u503c\u8ce6\u4e88 y<\/code>\uff0c\u6211\u5011\u53ef\u4ee5\u96a8\u610f\u4fee\u6539 y<\/code> \u7684\u503c\uff0c\u800c\u4e0d\u6703\u906d\u9047\u300cCannot use mutating member on immutable value: ‘X’\u300d\u7684\u932f\u8aa4\u3002<\/p>\n
\u6700\u4f73\u5be6\u8e10\u8207\u5efa\u8b70<\/h2>\n
\u5728\u7de8\u5beb Swift \u7a0b\u5f0f\u78bc\u6642\uff0c\u5efa\u8b70\u60a8\u9075\u5faa\u4ee5\u4e0b\u6700\u4f73\u5be6\u8e10\uff1a<\/p>\n
1. **\u660e\u78ba\u5340\u5206\u53ef\u8b8a\u8207\u4e0d\u53ef\u8b8a\u503c**\uff1a\u5728\u8a2d\u8a08\u6578\u64da\u7d50\u69cb\u6642\uff0c\u660e\u78ba\u6a19\u8a18\u54ea\u4e9b\u503c\u9700\u8981\u8b8a\u66f4\uff0c\u54ea\u4e9b\u503c\u61c9\u8a72\u4fdd\u6301\u4e0d\u8b8a\u3002
\n2. **\u4f7f\u7528\u9069\u7576\u7684\u8cc7\u6599\u7d50\u69cb**\uff1a\u6839\u64da\u9700\u8981\u9078\u64c7\u5408\u9069\u7684\u8cc7\u6599\u7d50\u69cb\uff0c\u4f8b\u5982\u4f7f\u7528 Array<\/code> \u6216 Dictionary<\/code> \u6642\uff0c\u8003\u616e\u5176\u53ef\u8b8a\u6027\u3002
\n3. **\u6e2c\u8a66\u548c\u8abf\u8a66**\uff1a\u5728\u958b\u767c\u904e\u7a0b\u4e2d\uff0c\u96a8\u6642\u6e2c\u8a66\u4ee3\u78bc\u7684\u904b\u884c\u6548\u679c\uff0c\u6355\u6349\u53ef\u80fd\u51fa\u73fe\u7684\u932f\u8aa4\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u672c\u6587\u4ecb\u7d39\u4e86 Swift \u4e2d\u7684\u932f\u8aa4\u8a0a\u606f\u300cCannot use mutating member on immutable value: ‘X’\u300d\uff0c\u4e26\u63d0\u4f9b\u4e86\u89e3\u6c7a\u65b9\u6848\u3002\u900f\u904e\u5c07\u4e0d\u53ef\u8b8a\u503c\u8f49\u63db\u70ba\u53ef\u8b8a\u503c\uff0c\u60a8\u53ef\u4ee5\u907f\u514d\u6b64\u932f\u8aa4\u4e26\u9806\u5229\u9032\u884c\u7de8\u7a0b\u3002\u5e0c\u671b\u9019\u7bc7\u6587\u7ae0\u80fd\u5e6b\u52a9\u60a8\u66f4\u6df1\u5165\u7406\u89e3 Swift \u8a9e\u8a00\u53ca\u5176\u932f\u8aa4\u8655\u7406\u6a5f\u5236\uff01<\/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:’X’\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-4255","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\/pcFK27-16D","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4255","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=4255"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4255\/revisions"}],"predecessor-version":[{"id":4256,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4255\/revisions\/4256"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=4255"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=4255"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=4255"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}