{"id":4247,"date":"2025-05-29T11:41:40","date_gmt":"2025-06-05T04:29:39","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4247"},"modified":"2025-06-05T11:41:40","modified_gmt":"2025-06-05T04:29:39","slug":"%e4%ba%86%e8%a7%a3swift%e4%b8%advalueoftypexhasnomembery%e9%8c%af%e8%aa%a4%e8%a7%a3%e6%9e%90-5","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%90-5\/","title":{"rendered":"\u6df1\u5165\u89e3\u6790 Swift \u932f\u8aa4\uff1a\u300cValue of type ‘X’ has no member ‘Y’\u300d\u53ca\u5176\u89e3\u6c7a\u65b9\u6848"},"content":{"rendered":"

<\/p>\n

\u6df1\u5165\u89e3\u6790 Swift \u932f\u8aa4\uff1a\u300cValue of type ‘X’ has no member ‘Y’\u300d\u53ca\u5176\u89e3\u6c7a\u65b9\u6848<\/h1>\n

Swift \u662f\u4e00\u7a2e\u5f37\u5927\u7684\u7de8\u7a0b\u8a9e\u8a00\uff0c\u4f46\u5728\u958b\u767c\u904e\u7a0b\u4e2d\uff0c\u958b\u767c\u8005\u7d93\u5e38\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\u8a0a\u606f\u3002\u5176\u4e2d\uff0c\u300cValue of type ‘X’ has no member ‘Y’\u300d\u662f\u4e00\u500b\u5e38\u898b\u7684\u932f\u8aa4\uff0c\u53ef\u80fd\u6703\u8b93\u4eba\u611f\u5230\u56f0\u60d1\u3002\u672c\u7bc7\u6587\u7ae0\u5c07\u6df1\u5165\u89e3\u6790\u9019\u500b\u932f\u8aa4\uff0c\u4e26\u63d0\u4f9b\u89e3\u6c7a\u65b9\u6848\u548c\u6700\u4f73\u5be6\u8e10\u4ee5\u5e6b\u52a9\u4f60\u907f\u514d\u985e\u4f3c\u7684\u554f\u984c\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\u7684\u4e00\u500b\u5e38\u898b\u932f\u8aa4\uff0c\u8868\u793a\u4f60\u5617\u8a66\u8a2a\u554f\u4e00\u500b\u4e0d\u5b58\u5728\u7684\u5c6c\u6027\u6216\u65b9\u6cd5\u3002\u5177\u9ad4\u4f86\u8aaa\uff0cX \u4ee3\u8868\u4f60\u6240\u4f7f\u7528\u7684\u985e\u578b\uff0c\u800c Y \u5247\u662f\u4f60\u5617\u8a66\u8a2a\u554f\u7684\u5c6c\u6027\u6216\u65b9\u6cd5\u3002\u9019\u901a\u5e38\u767c\u751f\u5728\u4ee5\u4e0b\u60c5\u6cc1\uff1a
\n– \u4f60\u4f7f\u7528\u4e86\u932f\u8aa4\u7684\u540d\u7a31\u6216\u62fc\u5beb
\n– \u8a72\u5c6c\u6027\u6216\u65b9\u6cd5\u6839\u672c\u4e0d\u5b58\u5728\u65bc\u8a72\u985e\u578b\u4e2d
\n– \u4f60\u53ef\u80fd\u9700\u8981\u5c0e\u5165\u76f8\u95dc\u7684\u6a21\u584a\u6216\u6846\u67b6<\/p>\n

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

\u8981\u89e3\u6c7a\u9019\u500b\u932f\u8aa4\uff0c\u53ef\u4ee5\u9075\u5faa\u4ee5\u4e0b\u6b65\u9a5f\uff1a<\/p>\n

1. \u6aa2\u67e5\u62fc\u5beb\u8207\u540d\u7a31<\/h3>\n

\u9996\u5148\uff0c\u78ba\u4fdd\u4f60\u5728\u4ee3\u78bc\u4e2d\u6b63\u78ba\u62fc\u5beb\u4e86\u985e\u578b\u3001\u5c6c\u6027\u6216\u65b9\u6cd5\u7684\u540d\u7a31\u3002\u5373\u4fbf\u662f\u4e00\u500b\u5c0f\u7684\u62fc\u5beb\u932f\u8aa4\u4e5f\u53ef\u80fd\u5c0e\u81f4\u9019\u985e\u932f\u8aa4\u3002<\/p>\n

2. \u67e5\u95b1\u5b98\u65b9\u6587\u6a94<\/h3>\n

\u8a2a\u554f [Swift \u5b98\u65b9\u6587\u6a94](https:\/\/swift.org\/documentation\/) \u67e5\u627e\u4f60\u6240\u4f7f\u7528\u7684\u985e\u578b\u7684\u6240\u6709\u53ef\u7528\u5c6c\u6027\u548c\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u5728\u4f7f\u7528 String \u985e\u578b\uff0c\u53ef\u4ee5\u901a\u904e\u641c\u7d22\u300cString\u300d\u4f86\u67e5\u770b\u5176\u6240\u6709\u53ef\u7528\u7684\u65b9\u6cd5\u548c\u5c6c\u6027\u3002<\/p>\n

3. \u78ba\u8a8d\u985e\u578b\u7684\u6b63\u78ba\u6027<\/h3>\n

\u78ba\u4fdd\u4f60\u4f7f\u7528\u7684\u8b8a\u6578\u985e\u578b\u8207\u4f60\u671f\u671b\u7684\u985e\u578b\u4e00\u81f4\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528 Swift \u7684\u985e\u578b\u6aa2\u67e5\u529f\u80fd\u4f86\u78ba\u8a8d\u8b8a\u6578\u7684\u985e\u578b\u3002\u4f8b\u5982\uff1a<\/p>\n

“`swift
\nlet myString: String = “Hello, World!”
\nprint(myString.count) \/\/ \u6b63\u78ba\u7684\u7528\u6cd5
\n“`<\/p>\n

\u5982\u679c\u4f60\u5617\u8a66\u8a2a\u554f\u4e00\u500b\u4e0d\u5b58\u5728\u7684\u5c6c\u6027\uff0c\u5c07\u6703\u5f15\u767c\u9019\u500b\u932f\u8aa4\u3002<\/p>\n

4. \u6aa2\u67e5\u5c0e\u5165\u7684\u6a21\u584a<\/h3>\n

\u67d0\u4e9b\u5c6c\u6027\u6216\u65b9\u6cd5\u53ef\u80fd\u9700\u8981\u7279\u5b9a\u7684\u6a21\u584a\u6216\u6846\u67b6\u624d\u80fd\u4f7f\u7528\u3002\u78ba\u4fdd\u4f60\u5df2\u7d93\u5c0e\u5165\u4e86\u6240\u9700\u7684\u6a21\u584a\u3002\u4f8b\u5982\uff1a<\/p>\n

“`swift
\nimport Foundation
\n“`<\/p>\n

\u5be6\u4f5c\u7bc4\u4f8b<\/h2>\n

\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u7bc4\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u907f\u514d\u300cValue of type ‘X’ has no member ‘Y’\u300d\u932f\u8aa4\uff1a<\/p>\n

“`swift
\nstruct Person {
\n var name: String
\n var age: Int
\n}<\/p>\n

let person = Person(name: “Alice”, age: 30)
\n\/\/ \u932f\u8aa4\u793a\u7bc4
\n\/\/ print(person.address) \/\/ \u6b64\u884c\u5c07\u5f15\u767c\u932f\u8aa4<\/p>\n

\/\/ \u6b63\u78ba\u7528\u6cd5
\nprint(person.name) \/\/ \u8f38\u51fa\uff1aAlice
\n“`<\/p>\n

\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u5b9a\u7fa9\u4e86\u4e00\u500b `Person` \u7d50\u69cb\uff0c\u4e26\u5617\u8a66\u8a2a\u554f\u4e00\u500b\u4e0d\u5b58\u5728\u7684 `address` \u5c6c\u6027\uff0c\u9019\u6703\u5c0e\u81f4\u932f\u8aa4\u3002\u78ba\u4fdd\u53ea\u8a2a\u554f\u5df2\u5b9a\u7fa9\u7684\u5c6c\u6027\uff0c\u9019\u662f\u907f\u514d\u8a72\u932f\u8aa4\u7684\u95dc\u9375\u3002<\/p>\n

\u932f\u8aa4\u6392\u9664\u6280\u5de7<\/h2>\n

– **\u4f7f\u7528 Xcode \u7684\u81ea\u52d5\u88dc\u5168\u529f\u80fd**\uff1a\u9019\u6709\u52a9\u65bc\u5728\u7de8\u5beb\u4ee3\u78bc\u6642\u907f\u514d\u62fc\u5beb\u932f\u8aa4\u3002
\n– **\u67e5\u770b\u932f\u8aa4\u8a0a\u606f**\uff1aSwift \u7de8\u8b6f\u5668\u901a\u5e38\u6703\u63d0\u4f9b\u8a73\u7d30\u7684\u932f\u8aa4\u8a0a\u606f\uff0c\u4ed4\u7d30\u95b1\u8b80\u53ef\u4ee5\u5e6b\u52a9\u4f60\u5feb\u901f\u5b9a\u4f4d\u554f\u984c\u3002
\n– **\u6e2c\u8a66\u8207\u8abf\u8a66**\uff1a\u5728\u5beb\u4ee3\u78bc\u5f8c\u9032\u884c\u6e2c\u8a66\uff0c\u53ca\u6642\u6355\u6349\u932f\u8aa4\u4e26\u9032\u884c\u8abf\u8a66\u3002<\/p>\n

\u7e3d\u7d50<\/h2>\n

\u300cValue of type ‘X’ has no member ‘Y’\u300d\u662f\u4e00\u500b\u5e38\u898b\u7684 Swift \u932f\u8aa4\uff0c\u901a\u5e38\u8207\u5c6c\u6027\u6216\u65b9\u6cd5\u7684\u62fc\u5beb\u932f\u8aa4\u3001\u985e\u578b\u4e0d\u6b63\u78ba\u6216\u7f3a\u4e4f\u5fc5\u8981\u7684\u6a21\u584a\u5c0e\u5165\u6709\u95dc\u3002\u901a\u904e\u6aa2\u67e5\u62fc\u5beb\u3001\u67e5\u95b1\u5b98\u65b9\u6587\u6a94\u548c\u78ba\u8a8d\u985e\u578b\u6b63\u78ba\u6027\uff0c\u4f60\u53ef\u4ee5\u8f15\u9b06\u89e3\u6c7a\u9019\u500b\u932f\u8aa4\u4e26\u6539\u5584\u4f60\u7684\u7a0b\u5f0f\u78bc\u8cea\u91cf\u3002<\/p>\n

Q&A\uff08\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff09<\/h2>\n

Q1: \u5982\u4f55\u77e5\u9053\u67d0\u500b\u985e\u578b\u6709\u54ea\u4e9b\u5c6c\u6027\u548c\u65b9\u6cd5\uff1f<\/h3>\n

A1: \u4f60\u53ef\u4ee5\u67e5\u95b1 Swift \u7684\u5b98\u65b9\u6587\u6a94\uff0c\u4e26\u641c\u7d22\u7279\u5b9a\u985e\u578b\u4ee5\u67e5\u770b\u5176\u6240\u6709\u5c6c\u6027\u548c\u65b9\u6cd5\u3002<\/p>\n

Q2: \u70ba\u4ec0\u9ebc\u6211\u7684\u8b8a\u6578\u985e\u578b\u4e0d\u6b63\u78ba\uff1f<\/h3>\n

A2: \u9019\u53ef\u80fd\u662f\u56e0\u70ba\u4f60\u672a\u6b63\u78ba\u6307\u5b9a\u8b8a\u6578\u7684\u985e\u578b\u6216\u5728\u4ee3\u78bc\u4e2d\u4f7f\u7528\u4e86\u4e0d\u517c\u5bb9\u7684\u985e\u578b\u3002\u6aa2\u67e5\u4f60\u7684\u8b8a\u6578\u5ba3\u544a\u548c\u4f7f\u7528\u65b9\u5f0f\u3002<\/p>\n

Q3: \u5982\u4f55\u78ba\u4fdd\u6240\u6709\u6a21\u584a\u5df2\u6b63\u78ba\u5c0e\u5165\uff1f<\/h3>\n

A3: \u5728\u4f60\u7684 Swift \u6a94\u6848\u7684\u9802\u90e8\uff0c\u78ba\u4fdd\u5c0e\u5165\u4e86\u6240\u6709\u5fc5\u8981\u7684\u6a21\u584a\u3002\u6aa2\u67e5\u6587\u6a94\u4ee5\u78ba\u4fdd\u4f60\u4f7f\u7528\u7684\u985e\u578b\u6216\u529f\u80fd\u662f\u5426\u9700\u8981\u984d\u5916\u7684\u6a21\u584a\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-4247","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\/pcFK27-16v","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4247","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=4247"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4247\/revisions"}],"predecessor-version":[{"id":4248,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4247\/revisions\/4248"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=4247"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=4247"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=4247"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}