{"id":4079,"date":"2025-06-01T11:48:03","date_gmt":"2025-06-05T04:07:02","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4079"},"modified":"2025-06-05T11:48:03","modified_gmt":"2025-06-05T04:07:02","slug":"%e8%a7%a3%e6%9e%90swift%e9%8c%af%e8%aa%a4%ef%bc%9a%e7%84%a1%e6%b3%95%e5%b0%87%e5%9e%8b%e5%88%a5x%e8%bd%89%e6%8f%9b%e7%82%ba%e9%a0%90%e6%9c%9f%e7%9a%84%e5%8f%83%e6%95%b8%e5%9e%8b%e5%88%a5y","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/swift\/%e8%a7%a3%e6%9e%90swift%e9%8c%af%e8%aa%a4%ef%bc%9a%e7%84%a1%e6%b3%95%e5%b0%87%e5%9e%8b%e5%88%a5x%e8%bd%89%e6%8f%9b%e7%82%ba%e9%a0%90%e6%9c%9f%e7%9a%84%e5%8f%83%e6%95%b8%e5%9e%8b%e5%88%a5y\/","title":{"rendered":"Swift \u932f\u8aa4\u89e3\u6790\uff1a\u5982\u4f55\u89e3\u6c7a\u300c\u7121\u6cd5\u5c07\u578b\u5225 &#8216;X&#8217; \u8f49\u63db\u70ba\u9810\u671f\u7684\u53c3\u6578\u578b\u5225 &#8216;Y&#8217;\u300d\u7684\u554f\u984c"},"content":{"rendered":"<p><meta name=\"keywords\" content=\"Swift, \u932f\u8aa4\u89e3\u6790, Cannot convert value of type 'X' to expected argument type 'Y'\"><\/p>\n<h1>Swift \u932f\u8aa4\u89e3\u6790\uff1a\u5982\u4f55\u89e3\u6c7a\u300c\u7121\u6cd5\u5c07\u578b\u5225 &#8216;X&#8217; \u8f49\u63db\u70ba\u9810\u671f\u7684\u53c3\u6578\u578b\u5225 &#8216;Y&#8217;\u300d\u7684\u554f\u984c<\/h1>\n<p>Swift \u662f\u4e00\u7a2e\u5f37\u5927\u7684\u7a0b\u5f0f\u8a9e\u8a00\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u5feb\u901f\u958b\u767c\u529f\u80fd\u8c50\u5bcc\u7684\u61c9\u7528\u7a0b\u5f0f\u3002\u7136\u800c\uff0c\u5728\u958b\u767c\u904e\u7a0b\u4e2d\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\uff0c\u5176\u4e2d\u4e00\u500b\u5e38\u898b\u7684\u932f\u8aa4\u662f\u300c\u7121\u6cd5\u5c07\u578b\u5225 &#8216;X&#8217; \u8f49\u63db\u70ba\u9810\u671f\u7684\u53c3\u6578\u578b\u5225 &#8216;Y&#8217;\u300d\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u6df1\u5165\u63a2\u8a0e\u8a72\u932f\u8aa4\u7684\u539f\u56e0\u53ca\u89e3\u6c7a\u65b9\u6848\uff0c\u4e26\u63d0\u4f9b\u6700\u4f73\u5be6\u8e10\u4f86\u907f\u514d\u6b64\u985e\u554f\u984c\u3002<\/p>\n<h2>\u932f\u8aa4\u7684\u539f\u56e0<\/h2>\n<p>\u6b64\u932f\u8aa4\u901a\u5e38\u767c\u751f\u5728\u4f60\u5617\u8a66\u5c07\u4e00\u500b\u503c\u8f49\u63db\u70ba\u53e6\u4e00\u7a2e\u4e0d\u76f8\u5bb9\u7684\u578b\u5225\u6642\u3002\u4f8b\u5982\uff0c\u4f60\u53ef\u80fd\u6703\u5617\u8a66\u5c07\u5b57\u4e32\u8f49\u63db\u70ba\u6574\u6578\uff0c\u6216\u5c07\u6574\u6578\u8f49\u63db\u70ba\u5e03\u6797\u503c\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u60c5\u6cc1\uff1a<\/p>\n<ul>\n<li>\u5b57\u4e32\u5305\u542b\u975e\u6578\u5b57\u5b57\u7b26\uff0c\u7121\u6cd5\u8f49\u63db\u70ba\u6574\u6578\u3002<\/li>\n<li>\u5617\u8a66\u5c07\u4e00\u500b\u6574\u6578\u76f4\u63a5\u50b3\u905e\u5230\u9700\u8981\u5e03\u6797\u503c\u7684\u51fd\u6578\u4e2d\u3002<\/li>\n<\/ul>\n<h2>\u5982\u4f55\u89e3\u6c7a\u9019\u500b\u554f\u984c\uff1f<\/h2>\n<p>\u70ba\u4e86\u6709\u6548\u89e3\u6c7a\u6b64\u554f\u984c\uff0c\u4f60\u9700\u8981\u78ba\u4fdd\u8f49\u63db\u7684\u503c\u8207\u9810\u671f\u7684\u578b\u5225\u76f8\u7b26\u3002\u4ee5\u4e0b\u662f\u5e7e\u7a2e\u6700\u4f73\u505a\u6cd5\uff1a<\/p>\n<h3>1. \u78ba\u8a8d\u503c\u7684\u578b\u5225<\/h3>\n<p>\u5728\u9032\u884c\u8f49\u63db\u524d\uff0c\u6700\u597d\u6aa2\u67e5\u503c\u7684\u578b\u5225\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u8981\u5c07\u5b57\u4e32\u8f49\u63db\u70ba\u6574\u6578\uff0c\u8acb\u78ba\u4fdd\u5b57\u4e32\u53ea\u5305\u542b\u6578\u5b57\uff1a<\/p>\n<pre class=\"brush: swift\">\nlet numberString = \"123\"\nif let number = Int(numberString) {\n    \/\/ number is a valid Int\n    print(\"\u8f49\u63db\u6210\u529f\uff0c\u6578\u5b57\u70ba\uff1a\\(number)\")\n} else {\n    \/\/ numberString could not be converted to an Int\n    print(\"\u8f49\u63db\u5931\u6557\uff0c\u8acb\u6aa2\u67e5\u5b57\u4e32\u5167\u5bb9\")\n}\n<\/pre>\n<h3>2. \u4f7f\u7528\u53ef\u9078\u578b\u5225\uff08Optional Types\uff09<\/h3>\n<p>\u53ef\u9078\u578b\u5225\u53ef\u4ee5\u66f4\u5b89\u5168\u5730\u8655\u7406\u8f49\u63db\uff0c\u7576\u8f49\u63db\u5931\u6557\u6642\u8fd4\u56de nil\uff0c\u907f\u514d\u7a0b\u5f0f\u5d29\u6f70\uff1a<\/p>\n<pre class=\"brush: swift\">\nlet optionalNumber: Int? = Int(numberString)\nif let validNumber = optionalNumber {\n    \/\/ \u4f7f\u7528\u6709\u6548\u7684\u6574\u6578\n    print(\"\u8f49\u63db\u6210\u529f\uff0c\u6578\u5b57\u70ba\uff1a\\(validNumber)\")\n} else {\n    \/\/ \u8655\u7406\u8f49\u63db\u5931\u6557\u7684\u60c5\u6cc1\n    print(\"\u7121\u6cd5\u5c07\u5b57\u4e32\u8f49\u63db\u70ba\u6574\u6578\")\n}\n<\/pre>\n<h3>3. \u932f\u8aa4\u6392\u9664<\/h3>\n<p>\u7576\u9047\u5230\u8f49\u63db\u932f\u8aa4\u6642\uff0c\u67e5\u770b\u932f\u8aa4\u8a0a\u606f\u80fd\u63d0\u4f9b\u91cd\u8981\u7684\u7dda\u7d22\u3002\u78ba\u4fdd\u5728\u958b\u767c\u904e\u7a0b\u4e2d\u8a18\u9304\u548c\u8655\u7406\u932f\u8aa4\uff0c\u4ee5\u4fbf\u53ca\u6642\u4fee\u6b63\u3002<\/p>\n<h2>\u5ef6\u4f38\u61c9\u7528<\/h2>\n<p>\u4e86\u89e3\u5982\u4f55\u8655\u7406\u578b\u5225\u8f49\u63db\u932f\u8aa4\u5f8c\uff0c\u4f60\u53ef\u4ee5\u8003\u616e\u5c07\u9019\u4e9b\u77e5\u8b58\u61c9\u7528\u5230\u66f4\u8907\u96dc\u7684\u60c5\u6cc1\u4e2d\uff0c\u4f8b\u5982\u5728\u8655\u7406 JSON \u6578\u64da\u6642\u3002\u7576\u5f9e\u7db2\u8def\u7372\u53d6\u6578\u64da\u6642\uff0c\u5e38\u6703\u9047\u5230\u578b\u5225\u4e0d\u5339\u914d\u7684\u60c5\u6cc1\uff0c\u9019\u6642\u5019\u4f7f\u7528\u53ef\u9078\u578b\u5225\u548c\u9069\u7576\u7684\u932f\u8aa4\u8655\u7406\u6a5f\u5236\u5c07\u975e\u5e38\u91cd\u8981\u3002<\/p>\n<h2>\u7e3d\u7d50<\/h2>\n<p>\u5728 Swift \u4e2d\uff0c\u7576\u4f60\u9047\u5230\u300c\u7121\u6cd5\u5c07\u578b\u5225 &#8216;X&#8217; 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