{"id":4251,"date":"2025-06-03T11:30:39","date_gmt":"2025-06-05T04:30:39","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4251"},"modified":"2025-06-05T11:30:39","modified_gmt":"2025-06-05T04:30:39","slug":"%e4%ba%86%e8%a7%a3swift%e4%b8%ad%e4%b8%8d%e5%8f%af%e8%ae%8a%e5%80%bc%e7%9a%84%e7%aa%81%e8%ae%8a%e5%8f%96%e5%80%bc-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%84%e7%aa%81%e8%ae%8a%e5%8f%96%e5%80%bc-5\/","title":{"rendered":"\u6df1\u5165\u89e3\u6790 Swift \u7684\u4e0d\u53ef\u8b8a\u503c\u932f\u8aa4\uff1a\u5982\u4f55\u907f\u514d\u300cCannot use mutating getter on immutable value\u300d"},"content":{"rendered":"<p><meta name=\"keywords\" content=\"Swift, Mutating Getter, Immutable Value, Swift \u7a0b\u5f0f\u6559\u5b78, Swift \u932f\u8aa4\u6392\u9664\"><\/p>\n<h1>\u6df1\u5165\u89e3\u6790 Swift \u7684\u4e0d\u53ef\u8b8a\u503c\u932f\u8aa4\uff1a\u5982\u4f55\u907f\u514d\u300cCannot use mutating getter on immutable value\u300d<\/h1>\n<p>\u5728 2025 \u5e74\u7684 Swift \u958b\u767c\u74b0\u5883\u4e2d\uff0c\u7406\u89e3\u4e0d\u53ef\u8b8a\u503c\u53ca\u5176\u932f\u8aa4\u662f\u6bcf\u4f4d\u958b\u767c\u8005\u5fc5\u9808\u638c\u63e1\u7684\u6280\u80fd\u4e4b\u4e00\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u6df1\u5165\u63a2\u8a0e Swift \u4e2d\u7684\u300cCannot use mutating getter on immutable value\u300d\u932f\u8aa4\uff0c\u4e26\u63d0\u4f9b\u6700\u65b0\u7684\u89e3\u6c7a\u65b9\u6848\u8207\u6700\u4f73\u5be6\u8e10\u3002<\/p>\n<h2>\u4ec0\u9ebc\u662f\u4e0d\u53ef\u8b8a\u503c\uff1f<\/h2>\n<p>\u5728 Swift \u4e2d\uff0c\u8b8a\u6578\u53ef\u4ee5\u88ab\u5b9a\u7fa9\u70ba\u53ef\u8b8a\u7684\uff08var\uff09\u6216\u4e0d\u53ef\u8b8a\u7684\uff08let\uff09\u3002\u53ef\u8b8a\u8b8a\u6578\u7684\u503c\u53ef\u4ee5\u88ab\u4fee\u6539\uff0c\u800c\u4e0d\u53ef\u8b8a\u8b8a\u6578\u5247\u7121\u6cd5\u66f4\u6539\u3002\u56e0\u6b64\uff0c\u7576\u4f60\u5617\u8a66\u5728\u4e0d\u53ef\u8b8a\u8b8a\u6578\u4e0a\u4f7f\u7528\u8b8a\u66f4\u7684\u53d6\u503c\u5668\u6642\uff0c\u5c31\u6703\u51fa\u73fe\u300cCannot use mutating getter on immutable value\u300d\u7684\u932f\u8aa4\u3002<\/p>\n<h2>\u932f\u8aa4\u539f\u56e0\u8a73\u89e3<\/h2>\n<p>\u9019\u500b\u932f\u8aa4\u901a\u5e38\u767c\u751f\u5728\u5617\u8a66\u4f7f\u7528 mutating \u65b9\u6cd5\u6216\u5c6c\u6027\u4f86\u4fee\u6539\u4e0d\u53ef\u8b8a\u503c\u7684\u60c5\u6cc1\u4e0b\u3002\u4f8b\u5982\uff0c\u7576\u4f60\u5728\u4e00\u500b\u4e0d\u53ef\u8b8a\u7684\u7d50\u69cb\u9ad4\u6216\u5217\u8209\u4e2d\u4f7f\u7528 mutating \u65b9\u6cd5\u6642\u5c31\u53ef\u80fd\u6703\u5c0e\u81f4\u9019\u500b\u932f\u8aa4\u3002<\/p>\n<h2>\u89e3\u6c7a\u65b9\u6848\uff1a\u5982\u4f55\u907f\u514d\u9019\u500b\u932f\u8aa4<\/h2>\n<p>\u8981\u89e3\u6c7a\u9019\u500b\u932f\u8aa4\uff0c\u6700\u76f4\u63a5\u7684\u65b9\u6cd5\u662f\u5c07\u8b8a\u6578\u5b9a\u7fa9\u70ba\u53ef\u8b8a\u7684\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre class=\"brush: swift\">\nstruct Counter {\n    var count: Int = 0\n\n    mutating func increment() {\n        count += 1\n    }\n}\n\nvar myCounter = Counter()\nmyCounter.increment() \/\/ \u9019\u884c\u53ef\u4ee5\u6210\u529f\u57f7\u884c\n<\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u5b9a\u7fa9\u4e86\u4e00\u500b\u53ef\u8b8a\u7684\u7d50\u69cb\u9ad4 <code>Counter<\/code>\uff0c\u4e26\u4f7f\u7528\u4e86 mutating \u65b9\u6cd5 <code>increment<\/code> \u4f86\u589e\u52a0\u8a08\u6578\u5668\u7684\u503c\u3002<\/p>\n<h2>\u9032\u968e\u61c9\u7528\uff1a\u4e0d\u53ef\u8b8a\u8207\u53ef\u8b8a\u7684\u5c0d\u6bd4<\/h2>\n<p>\u4e86\u89e3\u53ef\u8b8a\u8207\u4e0d\u53ef\u8b8a\u7684\u5340\u5225\u5c0d\u65bc\u907f\u514d\u932f\u8aa4\u81f3\u95dc\u91cd\u8981\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u9032\u968e\u7684\u4f7f\u7528\u6848\u4f8b\uff1a<\/p>\n<pre class=\"brush: swift\">\n\/\/ \u4e0d\u53ef\u8b8a\u4f8b\u5b50\nlet myImmutableCounter = Counter()\nmyImmutableCounter.increment() \/\/ \u9019\u884c\u6703\u5f15\u767c\u932f\u8aa4\n\n\/\/ \u53ef\u8b8a\u4f8b\u5b50\nvar myMutableCounter = Counter()\nmyMutableCounter.increment() \/\/ \u9019\u884c\u53ef\u4ee5\u6210\u529f\u57f7\u884c\n<\/pre>\n<h2>\u932f\u8aa4\u6392\u9664\u6280\u5de7<\/h2>\n<p>\u5982\u679c\u4f60\u5728\u958b\u767c\u904e\u7a0b\u4e2d\u9047\u5230\u9019\u500b\u932f\u8aa4\uff0c\u9996\u5148\u6aa2\u67e5\u8b8a\u6578\u662f\u5426\u6b63\u78ba\u5b9a\u7fa9\u70ba\u53ef\u8b8a\u7684\u3002\u5176\u6b21\uff0c\u78ba\u4fdd\u4f60\u7684\u65b9\u6cd5\u6216\u5c6c\u6027\u662f\u9069\u7576\u5730\u6a19\u8a18\u70ba <code>mutating<\/code>\u3002\u6700\u5f8c\uff0c\u6aa2\u67e5\u662f\u5426\u6709\u5176\u4ed6\u5730\u65b9\u5728\u5617\u8a66\u66f4\u6539\u4e0d\u53ef\u8b8a\u503c\u3002<\/p>\n<h2>\u7d50\u8ad6<\/h2>\n<p>\u907f\u514d\u300cCannot use mutating getter on immutable value\u300d\u932f\u8aa4\u7684\u65b9\u6cd5\u662f\u5c07\u8b8a\u6578\u5b9a\u7fa9\u70ba\u53ef\u8b8a\u7684\uff0c\u4e26\u7406\u89e3 Swift \u4e2d\u7684\u53ef\u8b8a\u8207\u4e0d\u53ef\u8b8a\u7279\u6027\u3002\u900f\u904e\u672c\u7bc7\u6587\u7ae0\u7684\u6559\u5b78\u8207\u7bc4\u4f8b\uff0c\u4f60\u61c9\u8a72\u80fd\u5920\u66f4\u81ea\u4fe1\u5730\u8655\u7406\u9019\u985e\u932f\u8aa4\uff0c\u4e26\u63d0\u5347 Swift \u958b\u767c\u7684\u6548\u7387\u3002<\/p>\n<h2>Q&#038;A\uff08\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff09<\/h2>\n<h3>1. \u4ec0\u9ebc\u662f mutating \u65b9\u6cd5\uff1f<\/h3>\n<p>mutating \u65b9\u6cd5\u662f Swift \u4e2d\u7528\u65bc\u4fee\u6539\u7d50\u69cb\u9ad4\u6216\u5217\u8209\u7684\u503c\u7684\u65b9\u6cd5\u3002\u9019\u4e9b\u65b9\u6cd5\u5fc5\u9808\u5728\u53ef\u8b8a\u7684\u5be6\u4f8b\u4e0a\u8abf\u7528\u3002<\/p>\n<h3>2. \u5982\u4f55\u5224\u65b7\u8b8a\u6578\u662f\u53ef\u8b8a\u9084\u662f\u4e0d\u53ef\u8b8a\uff1f<\/h3>\n<p>\u5728 Swift \u4e2d\uff0c\u4f7f\u7528 <code>var<\/code> \u5b9a\u7fa9\u7684\u8b8a\u6578\u662f\u53ef\u8b8a\u7684\uff0c\u800c\u4f7f\u7528 <code>let<\/code> \u5b9a\u7fa9\u7684\u8b8a\u6578\u5247\u662f\u4e0d\u53ef\u8b8a\u7684\u3002<\/p>\n<h3>3. \u4f55\u6642\u61c9\u8a72\u4f7f\u7528\u4e0d\u53ef\u8b8a\u503c\uff1f<\/h3>\n<p>\u4e0d\u53ef\u8b8a\u503c\u63d0\u9ad8\u4e86\u4ee3\u78bc\u7684\u5b89\u5168\u6027\u548c\u53ef\u9810\u6e2c\u6027\uff0c\u61c9\u5728\u72c0\u614b\u4e0d\u9700\u8981\u6539\u8b8a\u6642\u4f7f\u7528\uff0c\u4f8b\u5982\u5e38\u91cf\u6216\u914d\u7f6e\u53c3\u6578\u3002<\/p>\n<p>&#8212;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6458\u8981\uff1a\u672c\u6587\u5c07\u89e3\u91cbSwift\u4e2d\u4e0d\u53ef\u8b8a\u503c\u7684\u7a81\u8b8a\u53d6\u503c\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u6280\u5de7\u4f86\u89e3\u6c7a\u201cCannotusemutatinggetteronimmutablevalue:&#8217;X&#8217;\u201d\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-4251","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\/pcFK27-16z","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4251","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=4251"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4251\/revisions"}],"predecessor-version":[{"id":4252,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4251\/revisions\/4252"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=4251"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=4251"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=4251"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}