{"id":4163,"date":"2025-06-03T11:18:40","date_gmt":"2025-06-05T04:17:39","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4163"},"modified":"2025-06-05T11:18:40","modified_gmt":"2025-06-05T04:17:39","slug":"%e4%ba%86%e8%a7%a3swift%e4%b8%advalueoftypexhasnomembery%e9%8c%af%e8%aa%a4%e8%a7%a3%e6%9e%90-3","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/swift\/%e4%ba%86%e8%a7%a3swift%e4%b8%advalueoftypexhasnomembery%e9%8c%af%e8%aa%a4%e8%a7%a3%e6%9e%90-3\/","title":{"rendered":"\u6df1\u5165\u89e3\u6790 Swift \u932f\u8aa4\uff1a\u5982\u4f55\u89e3\u6c7a\u300cValue of type ‘X’ has no member ‘Y’\u300d"},"content":{"rendered":"

<\/p>\n

\u6df1\u5165\u89e3\u6790 Swift \u932f\u8aa4\uff1a\u5982\u4f55\u89e3\u6c7a\u300cValue of type ‘X’ has no member ‘Y’\u300d<\/h1>\n

Swift \u662f\u4e00\u7a2e\u5f37\u5927\u7684\u7a0b\u5f0f\u8a9e\u8a00\uff0c\u4f46\u662f\u7576\u4f60\u5728\u7de8\u5beb\u7a0b\u5f0f\u6642\uff0c\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\u3002\u5176\u4e2d\u4e00\u500b\u5e38\u898b\u7684\u932f\u8aa4\u662f\u300cValue of type ‘X’ has no member ‘Y’\u300d\u3002\u9019\u7a2e\u932f\u8aa4\u901a\u5e38\u6703\u8b93\u521d\u5b78\u8005\u611f\u5230\u56f0\u60d1\uff0c\u4f46\u53ea\u8981\u7406\u89e3\u5176\u539f\u56e0\u548c\u89e3\u6c7a\u65b9\u6cd5\uff0c\u5c31\u80fd\u8f15\u9b06\u8655\u7406\u3002<\/p>\n

\u4ec0\u9ebc\u662f\u300cValue of type ‘X’ has no member ‘Y’\u300d\u932f\u8aa4\uff1f<\/h2>\n

\u300cValue of type ‘X’ has no member ‘Y’\u300d\u932f\u8aa4\u662f Swift \u7de8\u8b6f\u5668\u62cb\u51fa\u7684\u4e00\u500b\u932f\u8aa4\uff0c\u8868\u793a\u4f60\u6b63\u5728\u5617\u8a66\u4f7f\u7528\u4e00\u500b\u4e0d\u5b58\u5728\u7684\u5c6c\u6027\u6216\u65b9\u6cd5\u3002\u5728\u9019\u500b\u932f\u8aa4\u8a0a\u606f\u4e2d\uff0cX \u4ee3\u8868\u4f60\u4f7f\u7528\u7684\u985e\u578b\uff0cY \u5247\u662f\u4f60\u5617\u8a66\u8a2a\u554f\u7684\u5c6c\u6027\u6216\u65b9\u6cd5\u3002<\/p>\n

\u5982\u4f55\u89e3\u6c7a\u300cValue of type ‘X’ has no member ‘Y’\u300d\u932f\u8aa4\uff1f<\/h2>\n

\u89e3\u6c7a\u9019\u500b\u932f\u8aa4\u7684\u6700\u4f73\u65b9\u6cd5\u662f\u4ed4\u7d30\u6aa2\u67e5\u4f60\u6b63\u5728\u4f7f\u7528\u7684\u985e\u578b\uff0c\u78ba\u4fdd\u5b83\u64c1\u6709\u4f60\u6240\u5617\u8a66\u8a2a\u554f\u7684\u5c6c\u6027\u6216\u65b9\u6cd5\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u89e3\u6c7a\u6b65\u9a5f\uff1a<\/p>\n

1. **\u78ba\u8a8d\u985e\u578b**\uff1a\u6aa2\u67e5\u4f60\u7684\u8b8a\u6578\u6216\u5e38\u6578\u985e\u578b\uff0c\u78ba\u4fdd\u5b83\u7b26\u5408\u9810\u671f\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u9810\u671f\u4f7f\u7528\u4e00\u500b\u5b57\u4e32\uff0c\u90a3\u9ebc\u8acb\u78ba\u8a8d\u5b83\u7684\u985e\u578b\u78ba\u5be6\u662f `String`\u3002<\/p>\n

2. **\u6aa2\u67e5\u53ef\u7528\u5c6c\u6027**\uff1a\u67e5\u770b\u8a72\u985e\u578b\u7684\u6587\u6a94\uff0c\u78ba\u8a8d\u5b83\u662f\u5426\u64c1\u6709\u4f60\u8981\u4f7f\u7528\u7684\u5c6c\u6027\u6216\u65b9\u6cd5\u3002\u5982\u679c\u5c0d\u65bc\u67d0\u500b\u985e\u578b\uff0c\u4f60\u4e0d\u78ba\u5b9a\u53ef\u7528\u7684\u5c6c\u6027\uff0c\u53ef\u4ee5\u4f7f\u7528 Xcode \u7684\u81ea\u52d5\u88dc\u5168\u529f\u80fd\u4f86\u67e5\u770b\u3002<\/p>\n

3. **\u4f7f\u7528\u6b63\u78ba\u7684\u5c6c\u6027**\uff1a\u5982\u4e0a\u4f8b\u6240\u793a\uff0c\u5982\u679c\u4f60\u60f3\u7372\u5f97\u5b57\u4e32\u7684\u9577\u5ea6\uff0c\u61c9\u4f7f\u7528 `count` \u800c\u4e0d\u662f `length`\u3002\u4ee5\u4e0b\u662f\u6b63\u78ba\u7684\u7528\u6cd5\u793a\u4f8b\uff1a<\/p>\n

\nlet myString = \"Hello World\"\nlet myStringLength = myString.count \/\/ \u6b63\u78ba\u8a08\u7b97\u5b57\u4e32\u9577\u5ea6\n<\/pre>\n
4. **\u985e\u578b\u8f49\u63db**\uff1a\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f60\u53ef\u80fd\u9700\u8981\u5c07\u4e00\u500b\u985e\u578b\u8f49\u63db\u70ba\u53e6\u4e00\u500b\u985e\u578b\uff0c\u4ee5\u4fbf\u4f7f\u7528\u8a72\u985e\u578b\u7684\u5c6c\u6027\u6216\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c\u5c07 `Any` \u985e\u578b\u8f49\u63db\u70ba\u5177\u9ad4\u985e\u578b\u3002<\/p>\n
\u932f\u8aa4\u6392\u9664\u793a\u4f8b<\/h2>\n
\u5047\u8a2d\u4f60\u6709\u4ee5\u4e0b\u4ee3\u78bc\uff1a<\/p>\n
\nlet myObject: Any = \"Hello\"\nlet myObjectLength = myObject.length \/\/ \u9019\u88e1\u6703\u5c0e\u81f4\u932f\u8aa4\n<\/pre>\n
\u9019\u884c\u4ee3\u78bc\u6703\u5c0e\u81f4\u300cValue of type ‘Any’ has no member ‘length’\u300d\u7684\u932f\u8aa4\u3002\u6b63\u78ba\u7684\u505a\u6cd5\u662f\u5c07 `myObject` \u8f49\u63db\u70ba `String` \u985e\u578b\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
\nif let myString = myObject as? String {\n    let myStringLength = myString.count \/\/ \u6b63\u78ba\n}\n<\/pre>\n
\u5ef6\u4f38\u61c9\u7528<\/h2>\n
\u719f\u6089\u5982\u4f55\u8655\u7406\u300cValue of type ‘X’ has no member ‘Y’\u300d\u932f\u8aa4\u4e0d\u50c5\u80fd\u5e6b\u52a9\u4f60\u5728\u7de8\u7a0b\u6642\u66f4\u6709\u6548\u7387\uff0c\u9084\u80fd\u8b93\u4f60\u5728\u9762\u5c0d\u5176\u4ed6\u985e\u578b\u7684\u932f\u8aa4\u6642\u66f4\u5177\u61c9\u5c0d\u80fd\u529b\u3002\u8003\u616e\u5b78\u7fd2 Swift \u7684\u5b98\u65b9\u6587\u6a94\uff0c\u4e26\u719f\u6089\u5e38\u898b\u7684\u7de8\u7a0b\u6a21\u5f0f\u548c\u6700\u4f73\u5be6\u8e10\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
\u300cValue of type ‘X’ has no member ‘Y’\u300d\u662f Swift \u7de8\u8b6f\u5668\u6240\u62cb\u51fa\u7684\u932f\u8aa4\uff0c\u8868\u793a\u4f60\u5617\u8a66\u4f7f\u7528\u4e00\u500b\u4e0d\u5b58\u5728\u7684\u5c6c\u6027\u6216\u65b9\u6cd5\u3002\u901a\u904e\u6aa2\u67e5\u985e\u578b\u548c\u4f7f\u7528\u6b63\u78ba\u7684\u5c6c\u6027\u6216\u65b9\u6cd5\uff0c\u4f60\u53ef\u4ee5\u8f15\u9b06\u89e3\u6c7a\u9019\u500b\u554f\u984c\uff0c\u4e26\u78ba\u4fdd\u4f60\u7684\u7a0b\u5f0f\u80fd\u5920\u6b63\u5e38\u904b\u884c\u3002<\/p>\n
\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff08Q&A\uff09<\/h2>\n
1. \u5982\u4f55\u77e5\u9053\u4e00\u500b\u985e\u578b\u6709\u54ea\u4e9b\u5c6c\u6027\u548c\u65b9\u6cd5\uff1f<\/h3>\n
\u53ef\u4ee5\u67e5\u770b Swift \u7684\u5b98\u65b9\u6587\u6a94\uff0c\u6216\u4f7f\u7528 Xcode \u7684\u81ea\u52d5\u88dc\u5168\u529f\u80fd\u4f86\u7372\u53d6\u8a72\u985e\u578b\u7684\u53ef\u7528\u5c6c\u6027\u548c\u65b9\u6cd5\u3002<\/p>\n
2. \u4ec0\u9ebc\u662f\u985e\u578b\u8f49\u63db\uff0c\u5982\u4f55\u4f7f\u7528\uff1f<\/h3>\n
\u985e\u578b\u8f49\u63db\u662f\u5c07\u4e00\u500b\u985e\u578b\u7684\u8b8a\u6578\u8f49\u63db\u70ba\u53e6\u4e00\u500b\u985e\u578b\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528 `as?` \u6216 `as!` \u9032\u884c\u53ef\u9078\u7684\u6216\u5f37\u5236\u7684\u985e\u578b\u8f49\u63db\u3002<\/p>\n
3. \u5982\u679c\u6211\u4e0d\u78ba\u5b9a\u985e\u578b\uff0c\u600e\u9ebc\u8fa6\uff1f<\/h3>\n
\u53ef\u4ee5\u4f7f\u7528 `type(of: variable)` \u4f86\u6aa2\u67e5\u8b8a\u6578\u7684\u78ba\u5207\u985e\u578b\uff0c\u4e26\u6839\u64da\u9700\u8981\u9032\u884c\u8abf\u6574\u3002<\/p>\n
—<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6587\u7ae0\u6458\u8981\uff1a\u672c\u6587\u5c07\u8a73\u7d30\u4ecb\u7d39Swift\u4e2dValueofType’X’HasNoMember’Y’\u932f\u8aa4\u89e3\u6790\uff0c\u8b93\u958b\u767c\u8005\u53ef\u4ee5\u66f4\u52a0\u4e86\u89e3Swift\u4e2d\u7684\u932f\u8aa4\u89e3\u6790\uff0c\u4e26\u4e14\u66f4\u52a0\u719f\u6089Swift\u7684\u8a9e\u6cd5\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-4163","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\/pcFK27-159","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4163","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=4163"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4163\/revisions"}],"predecessor-version":[{"id":4164,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4163\/revisions\/4164"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=4163"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=4163"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=4163"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}