{"id":4103,"date":"2025-06-04T11:21:36","date_gmt":"2025-06-05T04:10:36","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4103"},"modified":"2025-06-05T11:21:36","modified_gmt":"2025-06-05T04:10:36","slug":"%e5%ad%b8%e7%bf%92swift%e4%b8%ad%e7%9a%84for-in%e8%aa%9e%e5%8f%a5","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\/","title":{"rendered":"\u6df1\u5165\u5b78\u7fd2 Swift \u4e2d\u7684 For-In \u8a9e\u53e5\uff1a\u89e3\u6c7a Expected &#8216;in&#8217; \u932f\u8aa4\u7684\u5b8c\u6574\u6307\u5c0e"},"content":{"rendered":"<p><meta name=\"keywords\" content=\"Swift, For-In, Expected 'in' in for-in statement, Swift \u6559\u5b78, Swift \u932f\u8aa4\u6392\u9664\"><\/p>\n<h1>\u6df1\u5165\u5b78\u7fd2 Swift \u4e2d\u7684 For-In \u8a9e\u53e5\uff1a\u89e3\u6c7a Expected &#8216;in&#8217; \u932f\u8aa4\u7684\u5b8c\u6574\u6307\u5c0e<\/h1>\n<p>Swift \u662f\u4e00\u7a2e\u73fe\u4ee3\u5316\u7684\u7a0b\u5f0f\u8a9e\u8a00\uff0c\u7121\u8ad6\u662f\u5728 iOS \u958b\u767c\u9084\u662f\u5176\u4ed6\u5e73\u53f0\u4e0a\u7686\u5ee3\u6cdb\u4f7f\u7528\u3002\u5c0d\u65bc\u521d\u5b78\u8005\u4f86\u8aaa\uff0c<code>for-in<\/code> \u8a9e\u53e5\u662f\u4e00\u500b\u57fa\u790e\u800c\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u7528\u65bc\u904d\u6b77\u96c6\u5408\uff08\u5982\u9663\u5217\u3001\u5b57\u5178\u7b49\uff09\u3002\u7136\u800c\uff0c\u5728\u7de8\u5beb\u6b64\u8a9e\u53e5\u6642\uff0c\u958b\u767c\u8005\u5076\u723e\u6703\u9047\u5230\u4e00\u500b\u5e38\u898b\u7684\u932f\u8aa4\uff1a<strong>Expected &#8216;in&#8217; in for-in statement<\/strong>\u3002<\/p>\n<h2>\u4ec0\u9ebc\u662f For-In \u8a9e\u53e5\uff1f<\/h2>\n<p><code>for-in<\/code> \u8a9e\u53e5\u5141\u8a31\u6211\u5011\u8f15\u9b06\u5730\u904d\u6b77\u96c6\u5408\u4e2d\u7684\u6bcf\u4e00\u500b\u5143\u7d20\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre class=\"brush: swift\">\nfor item in collection {\n    \/\/ \u5c0d\u6bcf\u500b item \u57f7\u884c\u64cd\u4f5c\n}\n<\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>collection<\/code> \u4ee3\u8868\u6211\u5011\u8981\u904d\u6b77\u7684\u96c6\u5408\uff0c\u800c <code>item<\/code> \u5247\u662f\u96c6\u5408\u4e2d\u7684\u6bcf\u4e00\u500b\u5143\u7d20\u3002<code>in<\/code> \u95dc\u9375\u5b57\u662f\u9023\u63a5\u9019\u5169\u8005\u7684\u91cd\u8981\u7d44\u4ef6\uff0c\u7f3a\u5c11\u5b83\u5c07\u5c0e\u81f4\u932f\u8aa4\u3002<\/p>\n<h2>\u89e3\u6c7a Expected &#8216;in&#8217; \u932f\u8aa4<\/h2>\n<p>\u7576\u4f60\u5728\u4f7f\u7528 <code>for-in<\/code> \u8a9e\u53e5\u6642\uff0c\u82e5\u906d\u9047 <strong>Expected &#8216;in&#8217; in for-in statement<\/strong> \u7684\u932f\u8aa4\uff0c\u9019\u610f\u5473\u8457\u4f60\u7684\u7a0b\u5f0f\u78bc\u4e2d\u7f3a\u5c11\u4e86 <code>in<\/code> \u95dc\u9375\u5b57\u3002\u8981\u89e3\u6c7a\u6b64\u554f\u984c\uff0c\u4f60\u53ea\u9700\u78ba\u8a8d\u8a9e\u6cd5\u7684\u6b63\u78ba\u6027\uff0c\u4e26\u78ba\u4fdd <code>in<\/code> \u95dc\u9375\u5b57\u5b58\u5728\u65bc\u6b63\u78ba\u4f4d\u7f6e\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u932f\u8aa4\u793a\u7bc4\uff1a<\/p>\n<pre class=\"brush: swift\">\nfor item collection { \/\/ \u932f\u8aa4\uff1a\u7f3a\u5c11 'in'\n    print(item)\n}\n<\/pre>\n<p>\u6b63\u78ba\u7684\u5beb\u6cd5\u61c9\u5982\u4e0b\uff1a<\/p>\n<pre class=\"brush: swift\">\nfor item in collection {\n    print(item) \/\/ \u6b63\u78ba\uff1a'in' \u95dc\u9375\u5b57\u5b58\u5728\n}\n<\/pre>\n<h2>\u5be6\u4f5c\u7bc4\u4f8b<\/h2>\n<p>\u8b93\u6211\u5011\u901a\u904e\u4e00\u500b\u5be6\u969b\u7bc4\u4f8b\u4f86\u6f14\u793a <code>for-in<\/code> \u8a9e\u53e5\u7684\u4f7f\u7528\uff1a<\/p>\n<pre class=\"brush: swift\">\nlet numbers = [1, 2, 3, 4, 5]\n\nfor number in numbers {\n    print(\"Number is \\(number)\")\n}\n<\/pre>\n<p>\u9019\u6bb5\u7a0b\u5f0f\u78bc\u5c07\u904d\u6b77 <code>numbers<\/code> \u9663\u5217\u4e2d\u7684\u6bcf\u4e00\u500b\u6578\u5b57\uff0c\u4e26\u5c07\u5176\u6253\u5370\u5230\u63a7\u5236\u53f0\u3002<\/p>\n<h2>\u932f\u8aa4\u6392\u9664\u5c0f\u63d0\u793a<\/h2>\n<ul>\n<li>\u6aa2\u67e5\u662f\u5426\u6709\u62fc\u5beb\u932f\u8aa4\u6216\u984d\u5916\u7684\u7a7a\u683c\u3002<\/li>\n<li>\u78ba\u4fdd\u96c6\u5408\u4e0d\u70ba\u7a7a\uff0c\u5426\u5247\u4e0d\u6703\u9032\u5165 <code>for-in<\/code> \u8ff4\u5708\u3002<\/li>\n<li>\u4f7f\u7528 Xcode \u7684\u7de8\u8b6f\u5668\u63d0\u793a\u4f86\u5b9a\u4f4d\u932f\u8aa4\u3002<\/li>\n<\/ul>\n<h2>\u5ef6\u4f38\u61c9\u7528<\/h2>\n<p>\u9664\u4e86\u57fa\u672c\u7684\u96c6\u5408\u904d\u6b77\uff0c<code>for-in<\/code> \u8a9e\u53e5\u9084\u53ef\u4ee5\u8207\u5176\u4ed6 Swift \u7279\u6027\u7d50\u5408\u4f7f\u7528\uff0c\u4f8b\u5982\u4f7f\u7528 <code>enumerated()<\/code> \u65b9\u6cd5\u4f86\u540c\u6642\u7372\u53d6\u7d22\u5f15\u548c\u5143\u7d20\uff1a<\/p>\n<pre class=\"brush: swift\">\nfor (index, value) in numbers.enumerated() {\n    print(\"Index \\(index) has value \\(value)\")\n}\n<\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u66f4\u65b9\u4fbf\u5730\u8655\u7406\u9700\u8981\u7d22\u5f15\u7684\u60c5\u6cc1\u3002<\/p>\n<h2>\u7d50\u8ad6<\/h2>\n<p>\u7e3d\u7d50\u4f86\u8aaa\uff0c<strong>Expected &#8216;in&#8217; in for-in statement<\/strong> \u932f\u8aa4\u662f Swift \u958b\u767c\u4e2d\u5e38\u898b\u7684\u4e00\u500b\u554f\u984c\u3002\u900f\u904e\u6b63\u78ba\u7684\u8a9e\u6cd5\u4f7f\u7528\u548c\u6aa2\u67e5\uff0c\u4f60\u53ef\u4ee5\u8f15\u9b06\u89e3\u6c7a\u9019\u500b\u554f\u984c\u4e26\u63d0\u5347\u4f60\u7684\u7a0b\u5f0f\u78bc\u8cea\u91cf\u3002<\/p>\n<h2>Q&#038;A\uff08\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff09<\/h2>\n<h3>Q1: \u70ba\u4ec0\u9ebc\u6211\u5728 for-in \u8a9e\u53e5\u4e2d\u6703\u9047\u5230 &#8216;in&#8217; \u7684\u932f\u8aa4\uff1f<\/h3>\n<p>A1: \u9019\u901a\u5e38\u662f\u56e0\u70ba\u8a9e\u6cd5\u932f\u8aa4\uff0c\u7f3a\u5c11\u4e86 &#8216;in&#8217; \u95dc\u9375\u5b57\u3002\u8acb\u6aa2\u67e5\u4f60\u7684\u7a0b\u5f0f\u78bc\uff0c\u78ba\u4fdd &#8216;in&#8217; \u5728\u6b63\u78ba\u7684\u4f4d\u7f6e\u3002<\/p>\n<h3>Q2: \u9664\u4e86\u9663\u5217\uff0c\u6211\u9084\u53ef\u4ee5\u7528 for-in \u8a9e\u53e5\u904d\u6b77\u54ea\u4e9b\u96c6\u5408\uff1f<\/h3>\n<p>A2: \u4f60\u53ef\u4ee5\u4f7f\u7528 for-in \u8a9e\u53e5\u4f86\u904d\u6b77\u4efb\u4f55\u9075\u5faa Swift \u96c6\u5408\u5354\u8b70\u7684\u7269\u4ef6\uff0c\u5305\u62ec\u5b57\u5178\u3001\u96c6\u5408\u7b49\u3002<\/p>\n<h3>Q3: \u5982\u4f55\u5728 for-in \u8ff4\u5708\u4e2d\u540c\u6642\u7372\u53d6\u7d22\u5f15\u548c\u5143\u7d20\uff1f<\/h3>\n<p>A3: \u4f60\u53ef\u4ee5\u4f7f\u7528 <code>enumerated()<\/code> \u65b9\u6cd5\u4f86\u7372\u5f97\u5143\u7d20\u7684\u7d22\u5f15\u548c\u503c\u3002<\/p>\n<p>\u767c\u6398 Swift \u7684\u6f5b\u529b\uff0c\u8b93\u4f60\u7684\u7de8\u7a0b\u4e4b\u65c5\u66f4\u52a0\u9806\u5229\uff01<\/p>\n<p>&#8212;<\/p>\n<p>\u9019\u6a23\u7684\u512a\u5316\u4e0d\u50c5\u63d0\u5347\u4e86\u6587\u7ae0\u7684\u5167\u5bb9\u8cea\u91cf\u548c\u5be6\u7528\u6027\uff0c\u4e5f\u6539\u5584\u4e86 SEO \u8868\u73fe\uff0c\u4e26\u8a2d\u8a08\u4e86\u8207\u8b80\u8005\u4e92\u52d5\u7684 Q&#038;A \u5340\u584a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\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&#8217;in&#8217;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-4103","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\/pcFK27-14b","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4103","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=4103"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4103\/revisions"}],"predecessor-version":[{"id":4104,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4103\/revisions\/4104"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=4103"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=4103"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=4103"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}