{"id":4169,"date":"2025-05-30T12:13:04","date_gmt":"2025-06-05T04:18:03","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4169"},"modified":"2025-06-05T12:13:04","modified_gmt":"2025-06-05T04:18:03","slug":"%e4%ba%86%e8%a7%a3swift%e4%b8%ad%e4%b8%8d%e8%83%bd%e5%b0%8dget-only%e5%b1%ac%e6%80%a7%e9%80%b2%e8%a1%8c%e8%b3%a6%e5%80%bc%e7%9a%84%e5%8e%9f%e5%9b%a0-3","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/swift\/%e4%ba%86%e8%a7%a3swift%e4%b8%ad%e4%b8%8d%e8%83%bd%e5%b0%8dget-only%e5%b1%ac%e6%80%a7%e9%80%b2%e8%a1%8c%e8%b3%a6%e5%80%bc%e7%9a%84%e5%8e%9f%e5%9b%a0-3\/","title":{"rendered":"\u6df1\u5165\u4e86\u89e3 Swift \u4e2d\u7684 Get-Only \u5c6c\u6027\uff1a\u932f\u8aa4\u89e3\u6790\u8207\u6700\u4f73\u5be6\u8e10"},"content":{"rendered":"<p><meta name=\"keywords\" content=\"Swift, Get-only Property, Cannot assign to value, Swift \u6559\u5b78, Swift \u932f\u8aa4\u89e3\u6790\"><\/p>\n<h1>\u6df1\u5165\u4e86\u89e3 Swift \u4e2d\u7684 Get-Only \u5c6c\u6027\uff1a\u932f\u8aa4\u89e3\u6790\u8207\u6700\u4f73\u5be6\u8e10<\/h1>\n<p>\u5728 Swift \u4e2d\uff0c\u5c6c\u6027\u53ef\u4ee5\u88ab\u5b9a\u7fa9\u70ba\u53ea\u80fd\u8b80\u53d6\u7684\uff0c\u9019\u985e\u5c6c\u6027\u7a31\u70ba\u300cget-only\u300d\u5c6c\u6027\u3002\u7576\u4f60\u5617\u8a66\u5c0d\u9019\u4e9b\u5c6c\u6027\u8ce6\u503c\u6642\uff0c\u5c31\u6703\u9047\u5230\u932f\u8aa4\u8a0a\u606f\uff1a\u300cCannot assign to value: &#8216;X&#8217; is a get-only property\u300d\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u89e3\u6790\u9019\u500b\u932f\u8aa4\u7684\u539f\u56e0\u3001\u5982\u4f55\u89e3\u6c7a\u5b83\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\u4f86\u5e6b\u52a9\u4f60\u66f4\u597d\u5730\u4f7f\u7528 Swift\u3002<\/p>\n<h2>\u4ec0\u9ebc\u662f Get-Only \u5c6c\u6027\uff1f<\/h2>\n<p>\u5728 Swift \u4e2d\uff0c\u5c6c\u6027\u53ef\u4ee5\u4ee5\u300clet\u300d\u6216\u300cvar\u300d\u4f86\u5b9a\u7fa9\u3002\u300clet\u300d\u5b9a\u7fa9\u7684\u5c6c\u6027\u70ba\u5e38\u6578\uff0c\u7121\u6cd5\u66f4\u6539\uff1b\u800c\u300cvar\u300d\u5b9a\u7fa9\u7684\u5c6c\u6027\u70ba\u8b8a\u6578\uff0c\u53ef\u4ee5\u96a8\u6642\u8ce6\u503c\u3002\u7576\u5c6c\u6027\u88ab\u5b9a\u7fa9\u70ba\u300clet\u300d\u6642\uff0c\u5b83\u5c31\u662f\u4e00\u500b get-only \u5c6c\u6027\uff0c\u53ea\u80fd\u88ab\u8b80\u53d6\uff0c\u7121\u6cd5\u5beb\u5165\u3002<\/p>\n<h2>\u932f\u8aa4\u793a\u7bc4<\/h2>\n<p>\u8209\u500b\u4f8b\u5b50\uff0c\u5047\u8a2d\u4f60\u6709\u4e00\u500b\u540d\u70ba\u300cPerson\u300d\u7684\u985e\u5225\uff0c\u4e26\u4e14\u5b83\u6709\u4e00\u500b\u53ea\u80fd\u8b80\u53d6\u7684\u5c6c\u6027\u300cname\u300d\uff1a<\/p>\n<pre class=\"brush: swift\">\nclass Person {\n    let name: String\n    init(name: String) {\n        self.name = name\n    }\n}\n<\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u300cname\u300d\u5c6c\u6027\u88ab\u5b9a\u7fa9\u70ba\u300clet\u300d\uff0c\u9019\u8868\u793a\u5b83\u662f\u4e00\u500b\u53ea\u80fd\u8b80\u53d6\u7684\u5c6c\u6027\u3002\u5982\u679c\u4f60\u5617\u8a66\u5c0d\u5b83\u8ce6\u503c\uff0cSwift \u5c31\u6703\u5831\u544a\u932f\u8aa4\uff1a<\/p>\n<pre class=\"brush: swift\">\nlet person = Person(name: \"John\")\nperson.name = \"Jane\" \/\/ Cannot assign to value: 'name' is a get-only property\n<\/pre>\n<h2>\u5982\u4f55\u89e3\u6c7a\u9019\u500b\u554f\u984c\uff1f<\/h2>\n<p>\u70ba\u4e86\u89e3\u6c7a\u9019\u500b\u554f\u984c\uff0c\u4f60\u53ef\u4ee5\u5c07\u300cname\u300d\u5c6c\u6027\u5b9a\u7fa9\u70ba\u300cvar\u300d\uff0c\u9019\u6a23\u5c31\u53ef\u4ee5\u5c0d\u5b83\u9032\u884c\u8ce6\u503c\uff1a<\/p>\n<pre class=\"brush: swift\">\nclass Person {\n    var name: String\n    init(name: String) {\n        self.name = name\n    }\n}\n<\/pre>\n<p>\u73fe\u5728\u4f60\u53ef\u4ee5\u81ea\u7531\u5730\u66f4\u6539\u300cname\u300d\u5c6c\u6027\u7684\u503c\uff1a<\/p>\n<pre class=\"brush: swift\">\nlet person = Person(name: \"John\")\nperson.name = \"Jane\" \/\/ OK\n<\/pre>\n<h2>\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u5728\u8a2d\u8a08\u985e\u5225\u6642\uff0c\u61c9\u8a72\u6839\u64da\u9700\u6c42\u9078\u64c7\u9069\u7576\u7684\u5c6c\u6027\u8a2a\u554f\u63a7\u5236\u3002\u5982\u679c\u5c6c\u6027\u503c\u5728\u5be6\u4f8b\u5316\u5f8c\u4e0d\u6703\u6539\u8b8a\uff0c\u4f7f\u7528\u300clet\u300d\u4f86\u5b9a\u7fa9\u5b83\uff0c\u9019\u6a23\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u78bc\u7684\u5b89\u5168\u6027\u548c\u53ef\u8b80\u6027\u3002\u5982\u679c\u5c6c\u6027\u503c\u9700\u8981\u8b8a\u66f4\uff0c\u5247\u61c9\u4f7f\u7528\u300cvar\u300d\u3002<\/p>\n<h2>\u5ef6\u4f38\u61c9\u7528<\/h2>\n<p>\u5728 Swift \u4e2d\uff0c\u9664\u4e86\u57fa\u672c\u7684 get-only \u5c6c\u6027\uff0c\u9084\u53ef\u4ee5\u4f7f\u7528\u8a08\u7b97\u5c6c\u6027\u4f86\u9032\u4e00\u6b65\u589e\u5f37\u985e\u5225\u7684\u529f\u80fd\u3002\u8a08\u7b97\u5c6c\u6027\u5141\u8a31\u4f60\u5728\u8b80\u53d6\u6642\u57f7\u884c\u4e00\u4e9b\u8a08\u7b97\u908f\u8f2f\uff0c\u800c\u4e0d\u9700\u8981\u5132\u5b58\u4e00\u500b\u5be6\u969b\u7684\u503c\u3002\u9019\u5728\u8a31\u591a\u60c5\u6cc1\u4e0b\u90fd\u975e\u5e38\u6709\u7528\u3002<\/p>\n<h2>\u932f\u8aa4\u6392\u9664<\/h2>\n<p>\u5982\u679c\u4f60\u9047\u5230\u300cCannot assign to value: &#8216;X&#8217; is a get-only property\u300d\u7684\u932f\u8aa4\uff0c\u8acb\u6aa2\u67e5\u4f60\u662f\u5426\u4e0d\u5c0f\u5fc3\u5c0d\u4e00\u500b\u300clet\u300d\u5c6c\u6027\u9032\u884c\u8ce6\u503c\u3002\u78ba\u8a8d\u5c6c\u6027\u5b9a\u7fa9\u4e26\u6839\u64da\u9700\u6c42\u9032\u884c\u9069\u7576\u7684\u4fee\u6539\u3002<\/p>\n<h2>\u7d50\u8ad6<\/h2>\n<p>\u7406\u89e3 Swift \u4e2d\u7684 get-only \u5c6c\u6027\u53ca\u5176\u9650\u5236\u5c0d\u65bc\u958b\u767c\u8005\u4f86\u8aaa\u81f3\u95dc\u91cd\u8981\u3002\u900f\u904e\u9069\u7576\u7684\u5c6c\u6027\u5b9a\u7fa9\uff0c\u4e0d\u50c5\u53ef\u4ee5\u907f\u514d\u932f\u8aa4\uff0c\u9084\u80fd\u63d0\u5347\u4ee3\u78bc\u7684\u6e05\u6670\u5ea6\u548c\u5b89\u5168\u6027\u3002<\/p>\n<h2>Q&#038;A\uff08\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff09<\/h2>\n<h3>1. 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