{"id":4225,"date":"2025-06-02T11:40:27","date_gmt":"2025-06-05T04:25:26","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4225"},"modified":"2025-06-05T11:40:27","modified_gmt":"2025-06-05T04:25:26","slug":"%e5%ad%b8%e7%bf%92swift%e4%b8%ad%e7%9a%84for-in%e8%aa%9e%e5%8f%a5-4","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/swift\/%e5%ad%b8%e7%bf%92swift%e4%b8%ad%e7%9a%84for-in%e8%aa%9e%e5%8f%a5-4\/","title":{"rendered":"2025 \u5e74\u6700\u65b0 Swift \u7a0b\u5f0f\u6559\u5b78\uff1a\u89e3\u6c7a\u300cExpected ‘in’ in for-in statement\u300d\u932f\u8aa4"},"content":{"rendered":"

<\/p>\n

2025 \u5e74\u6700\u65b0 Swift \u7a0b\u5f0f\u6559\u5b78\uff1a\u89e3\u6c7a\u300cExpected ‘in’ in for-in statement\u300d\u932f\u8aa4<\/h1>\n

Swift \u662f\u4e00\u7a2e\u73fe\u4ee3\u4e14\u529f\u80fd\u5f37\u5927\u7684\u7a0b\u5f0f\u8a9e\u8a00\uff0c\u5176\u8a9e\u6cd5\u8207\u5176\u4ed6\u8a9e\u8a00\u5927\u76f8\u9015\u5ead\u3002\u8a31\u591a\u7a0b\u5f0f\u8a2d\u8a08\u5e2b\u5728\u4f7f\u7528 Swift \u6642\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\uff0c\u5176\u4e2d\u4e00\u500b\u5e38\u898b\u7684\u932f\u8aa4\u662f\u300cExpected ‘in’ in for-in statement\u300d\u3002\u5728\u9019\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u5011\u5c07\u6df1\u5165\u89e3\u6790\u9019\u500b\u932f\u8aa4\u7684\u6839\u672c\u539f\u56e0\uff0c\u4e26\u6559\u60a8\u5982\u4f55\u5feb\u901f\u6709\u6548\u5730\u89e3\u6c7a\u5b83\u3002<\/p>\n

\u4ec0\u9ebc\u662f\u300cExpected ‘in’ in for-in statement\u300d\u932f\u8aa4\uff1f<\/h2>\n

\u300cExpected ‘in’ in for-in statement\u300d\u932f\u8aa4\u662f Swift \u4e2d\u7684\u4e00\u500b\u8a9e\u6cd5\u932f\u8aa4\uff0c\u9019\u610f\u5473\u8457\u60a8\u7684 for-in \u8a9e\u53e5\u4e2d\u7f3a\u5c11\u4e86\u95dc\u9375\u5b57 `in`\u3002\u6b63\u78ba\u7684 for-in \u8a9e\u53e5\u7d50\u69cb\u5982\u4e0b\uff1a<\/p>\n

\nfor item<\/i> in sequence<\/i> {\n    \/\/ \u8fed\u4ee3\u5e8f\u5217\u4e2d\u7684\u5143\u7d20\n}\n<\/pre>\n
\u5982\u679c\u5728\u9019\u500b\u7d50\u69cb\u4e2d\u7f3a\u5c11 `in`\uff0c\u7de8\u8b6f\u5668\u5c07\u7121\u6cd5\u7406\u89e3\u60a8\u7684\u610f\u5716\uff0c\u5f9e\u800c\u5f15\u767c\u8a72\u932f\u8aa4\u3002<\/p>\n
\u70ba\u4ec0\u9ebc\u6703\u51fa\u73fe\u300cExpected ‘in’ in for-in statement\u300d\u932f\u8aa4\uff1f<\/h2>\n
\u9019\u500b\u932f\u8aa4\u901a\u5e38\u51fa\u73fe\u65bc\u4ee5\u4e0b\u60c5\u6cc1\uff1a<\/p>\n
1. \u932f\u8aa4\u7684\u8a9e\u6cd5\u7d50\u69cb\uff1a\u4f8b\u5982\uff0c\u60a8\u53ef\u80fd\u6703\u5c07 `in` \u95dc\u9375\u5b57\u610f\u5916\u522a\u9664\u6216\u653e\u7f6e\u932f\u8aa4\u7684\u4f4d\u7f6e\u3002
\n2. \u8907\u88fd\u7c98\u8cbc\u932f\u8aa4\uff1a\u5f9e\u5176\u4ed6\u7a0b\u5f0f\u78bc\u4e2d\u8907\u88fd\u6642\uff0c\u53ef\u80fd\u6703\u907a\u6f0f\u67d0\u4e9b\u95dc\u9375\u5b57\u3002
\n3. \u6e96\u5099\u9032\u884c\u8fed\u4ee3\u6642\uff0c\u672a\u6b63\u78ba\u8a2d\u7f6e\u5e8f\u5217\u3002<\/p>\n
\u5982\u4f55\u89e3\u6c7a\u300cExpected ‘in’ in for-in statement\u300d\u932f\u8aa4\uff1f<\/h2>\n
\u89e3\u6c7a\u9019\u500b\u932f\u8aa4\u7684\u65b9\u6cd5\u975e\u5e38\u7c21\u55ae\uff0c\u60a8\u53ea\u9700\u78ba\u4fdd\u5728 for-in \u8a9e\u53e5\u4e2d\u6b63\u78ba\u4f7f\u7528 `in` \u95dc\u9375\u5b57\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u6b63\u78ba\u7684\u7bc4\u4f8b\uff1a<\/p>\n
\nlet numbers = [1, 2, 3, 4, 5]\n\nfor number in numbers {\n    print(number) \/\/ \u5c07\u6703\u5370\u51fa 1 \u5230 5 \u7684\u6578\u5b57\n}\n<\/pre>\n
\u5728\u9019\u6bb5\u7a0b\u5f0f\u78bc\u4e2d\uff0c\u6211\u5011\u5b9a\u7fa9\u4e86\u4e00\u500b\u6574\u6578\u9663\u5217 `numbers`\uff0c\u4e26\u4f7f\u7528 for-in \u8a9e\u53e5\u8fed\u4ee3\u5176\u5143\u7d20\u3002\u5728\u6bcf\u6b21\u8fed\u4ee3\u4e2d\uff0c`number` \u5c07\u7372\u53d6\u9663\u5217\u4e2d\u7684\u6bcf\u500b\u503c\u3002<\/p>\n
\u932f\u8aa4\u6392\u9664\u6280\u5de7<\/h2>\n
1. **\u6aa2\u67e5\u8a9e\u6cd5**\uff1a\u78ba\u4fdd\u6240\u6709\u7684 for-in \u8a9e\u53e5\u90fd\u9075\u5faa\u6b63\u78ba\u7684\u8a9e\u6cd5\u7d50\u69cb\u3002
\n2. **\u4f7f\u7528 Xcode \u7684\u7de8\u8b6f\u5668\u63d0\u793a**\uff1aXcode \u901a\u5e38\u6703\u63d0\u4f9b\u8a9e\u6cd5\u932f\u8aa4\u7684\u5177\u9ad4\u4f4d\u7f6e\uff0c\u60a8\u53ef\u4ee5\u6839\u64da\u63d0\u793a\u9032\u884c\u4fee\u6b63\u3002
\n3. **\u67e5\u770b\u5b98\u65b9\u6587\u6a94**\uff1a\u7576\u60a8\u9047\u5230\u4e0d\u78ba\u5b9a\u7684\u8a9e\u6cd5\u6642\uff0c\u67e5\u95b1 Swift \u7684\u5b98\u65b9\u6587\u6a94\u53ef\u4ee5\u63d0\u4f9b\u984d\u5916\u7684\u5e6b\u52a9\u3002<\/p>\n
\u5ef6\u4f38\u61c9\u7528<\/h2>\n
\u9664\u4e86\u57fa\u672c\u7684 for-in \u7528\u6cd5\uff0c\u60a8\u9084\u53ef\u4ee5\u5728\u66f4\u8907\u96dc\u7684\u5834\u666f\u4e2d\u4f7f\u7528\u5b83\uff0c\u4f8b\u5982\uff1a<\/p>\n
– \u8fed\u4ee3\u5b57\u5178\uff1a\u4f7f\u7528 for-in \u8a9e\u53e5\u53ef\u4ee5\u8f15\u9b06\u8fed\u4ee3\u5b57\u5178\u7684\u9375\u503c\u5c0d\u3002<\/p>\n
\n  let fruitPrices = [\"Apple\": 1.5, \"Banana\": 0.5, \"Cherry\": 2.0]\n  \n  for (fruit, price) in fruitPrices {\n      print(\"\\(fruit): $\\(price)\")\n  }\n  <\/pre>\n
– \u7d50\u5408 `where` \u5b50\u53e5\u9032\u884c\u689d\u4ef6\u7be9\u9078\uff1a\u60a8\u53ef\u4ee5\u5728 for-in \u8a9e\u53e5\u4e2d\u4f7f\u7528 where \u5b50\u53e5\u4f86\u7be9\u9078\u7279\u5b9a\u689d\u4ef6\u7684\u5143\u7d20\u3002<\/p>\n
\n  for number in numbers where number % 2 == 0 {\n      print(\"\\(number) \u662f\u5076\u6578\")\n  }\n  <\/pre>\n
\u7d50\u8ad6<\/h2>\n
\u300cExpected ‘in’ in for-in statement\u300d\u662f Swift \u4e2d\u7684\u5e38\u898b\u8a9e\u6cd5\u932f\u8aa4\uff0c\u89e3\u6c7a\u7684\u65b9\u5f0f\u5c31\u662f\u78ba\u4fdd\u5728 for-in \u8a9e\u53e5\u4e2d\u5305\u542b `in` \u95dc\u9375\u5b57\u3002\u901a\u904e\u6b63\u78ba\u7684\u8a9e\u6cd5\uff0c\u60a8\u53ef\u4ee5\u6709\u6548\u5730\u8fed\u4ee3\u5e8f\u5217\u4e26\u9032\u884c\u8cc7\u6599\u8655\u7406\u3002<\/p>\n
Q&A\uff08\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff09<\/h2>\n
1. \u5982\u679c\u6211\u9047\u5230\u5176\u4ed6 Swift \u932f\u8aa4\u8a72\u600e\u9ebc\u8fa6\uff1f<\/h3>\n
\u8acb\u6aa2\u67e5\u8a9e\u6cd5\uff0c\u4f7f\u7528 Xcode \u7684\u932f\u8aa4\u63d0\u793a\u529f\u80fd\uff0c\u4e26\u53c3\u8003 Swift \u5b98\u65b9\u6587\u6a94\u3002<\/p>\n
2. for-in \u8a9e\u53e5\u6709\u4ec0\u9ebc\u5176\u4ed6\u7528\u9014\uff1f<\/h3>\n
for-in \u8a9e\u53e5\u4e0d\u50c5\u53ef\u4ee5\u7528\u65bc\u6578\u7d44\uff0c\u9084\u53ef\u4ee5\u7528\u4f86\u8fed\u4ee3\u5b57\u5178\u548c\u96c6\u5408\uff0c\u751a\u81f3\u53ef\u4ee5\u914d\u5408\u689d\u4ef6\u7be9\u9078\u4f7f\u7528\u3002<\/p>\n
3. \u6709\u54ea\u4e9b Swift \u8a9e\u6cd5\u7684\u6700\u4f73\u5be6\u8e10\uff1f<\/h3>\n
\u9075\u5faa\u8a9e\u6cd5\u898f\u7bc4\u3001\u4f7f\u7528\u6e05\u6670\u7684\u547d\u540d\u3001\u64b0\u5beb\u8a3b\u89e3\u4ee5\u53ca\u4fdd\u6301\u7a0b\u5f0f\u78bc\u7c21\u6f54\u90fd\u662f\u6700\u4f73\u5be6\u8e10\u7684\u4e00\u90e8\u5206\u3002
\n—<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6587\u7ae0\u6458\u8981\uff1a\u672c\u6587\u5c07\u4ecb\u7d39Swift\u4e2d\u7684For-In\u8a9e\u53e5\uff0c\u8a73\u7d30\u89e3\u91cb\u5176\u8a9e\u6cd5\u898f\u5247\uff0c\u4e26\u63d0\u4f9b\u793a\u4f8b\u4ee5\u4f9b\u53c3\u8003\u3002\u6b64\u5916\uff0c\u9084\u5c07\u89e3\u91cb\u5982\u4f55\u89e3\u6c7a\u201cExpected’in’infor-instatement\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-4225","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\/pcFK27-169","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4225","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=4225"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4225\/revisions"}],"predecessor-version":[{"id":4226,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4225\/revisions\/4226"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=4225"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=4225"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=4225"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}