{"id":4183,"date":"2025-06-01T11:43:45","date_gmt":"2025-06-05T04:19:45","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4183"},"modified":"2025-06-05T11:43:45","modified_gmt":"2025-06-05T04:19:45","slug":"%e5%ad%b8%e7%bf%92swift%e4%b8%ad%e7%9a%84for-in%e8%aa%9e%e5%8f%a5-3","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%a5-3\/","title":{"rendered":"2025 \u6700\u65b0 Swift \u7a0b\u5f0f\u6559\u5b78\uff1a\u6df1\u5165\u89e3\u6790 For-In \u8a9e\u53e5\u8207\u932f\u8aa4\u6392\u9664\u6280\u5de7"},"content":{"rendered":"<p><meta name=\"keywords\" content=\"Swift, For-In \u8a9e\u53e5, \u932f\u8aa4\u6392\u9664, Swift \u6559\u5b78\"><\/p>\n<h1>2025 \u6700\u65b0 Swift \u7a0b\u5f0f\u6559\u5b78\uff1a\u6df1\u5165\u89e3\u6790 For-In \u8a9e\u53e5\u8207\u932f\u8aa4\u6392\u9664\u6280\u5de7<\/h1>\n<p>Swift \u662f\u4e00\u7a2e\u73fe\u4ee3\u5316\u7684\u7a0b\u5f0f\u8a9e\u8a00\uff0c\u8a9e\u6cd5\u7c21\u6f54\u4e14\u529f\u80fd\u5f37\u5927\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc iOS \u548c macOS \u7684\u958b\u767c\u3002\u5728\u4f7f\u7528 Swift \u7de8\u5beb\u7a0b\u5f0f\u6642\uff0c\u958b\u767c\u8005\u5e38\u6703\u9047\u5230\u5404\u7a2e\u8a9e\u6cd5\u932f\u8aa4\uff0c\u5176\u4e2d\u4e00\u500b\u5e38\u898b\u7684\u932f\u8aa4\u662f\u300cExpected &#8216;in&#8217; in for-in statement\u300d\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u5e6b\u52a9\u4f60\u6df1\u5165\u4e86\u89e3 for-in \u8a9e\u53e5\u7684\u6b63\u78ba\u7528\u6cd5\uff0c\u4ee5\u53ca\u5982\u4f55\u6392\u9664\u76f8\u95dc\u932f\u8aa4\u3002<\/p>\n<h2>\u4ec0\u9ebc\u662f For-In \u8a9e\u53e5\uff1f<\/h2>\n<p>for-in \u8a9e\u53e5\u662f Swift \u4e2d\u7528\u4f86\u904d\u6b77\u96c6\u5408\uff08\u5982\u9663\u5217\u3001\u5b57\u5178\u3001\u96c6\u5408\u7b49\uff09\u7684\u8a9e\u6cd5\u3002\u9019\u4f7f\u5f97\u5728 Swift \u4e2d\u8fed\u4ee3\u8cc7\u6599\u8b8a\u5f97\u7c21\u55ae\u800c\u76f4\u89c0\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre class=\"brush: swift\">\nfor item in collection {\n    \/\/ \u5728\u9019\u88e1\u5c0d\u6bcf\u500b item \u9032\u884c\u64cd\u4f5c\n}\n<\/pre>\n<p>\u5728\u4e0a\u8ff0\u7a0b\u5f0f\u78bc\u4e2d\uff0c<code>collection<\/code> \u4ee3\u8868\u4e00\u500b\u96c6\u5408\uff0c\u800c <code>item<\/code> \u5247\u662f\u96c6\u5408\u4e2d\u7684\u6bcf\u4e00\u500b\u5143\u7d20\u3002for-in \u8a9e\u53e5\u6703\u9010\u4e00\u53d6\u51fa\u96c6\u5408\u4e2d\u7684\u5143\u7d20\uff0c\u4e26\u57f7\u884c\u5927\u62ec\u865f\u5167\u7684\u7a0b\u5f0f\u78bc\u3002<\/p>\n<h2>\u70ba\u4ec0\u9ebc\u6703\u51fa\u73fe\u300cExpected &#8216;in&#8217; in for-in statement\u300d\u932f\u8aa4\uff1f<\/h2>\n<p>\u7576\u4f60\u5728\u4f7f\u7528 for-in \u8a9e\u53e5\u6642\uff0c\u5982\u679c\u5fd8\u8a18\u52a0\u5165\u95dc\u9375\u5b57 <code>in<\/code>\uff0c\u5c31\u6703\u51fa\u73fe\u6b64\u932f\u8aa4\u3002\u4ee5\u4e0b\u662f\u6703\u5c0e\u81f4\u8a72\u932f\u8aa4\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre class=\"brush: swift\">\nfor item collection { \/\/ \u932f\u8aa4\uff1a\u7f3a\u5c11 in \u95dc\u9375\u5b57\n    \/\/ do something with item\n}\n<\/pre>\n<p>\u986f\u7136\uff0c\u9019\u6bb5\u7a0b\u5f0f\u78bc\u7f3a\u5c11\u4e86 <code>in<\/code> \u95dc\u9375\u5b57\uff0c\u56e0\u6b64 Swift \u7de8\u8b6f\u5668\u6703\u5831\u932f\u63d0\u793a\u4f60\u9700\u8981\u6dfb\u52a0\u5b83\u3002<\/p>\n<h2>\u5982\u4f55\u89e3\u6c7a\u300cExpected &#8216;in&#8217; in for-in statement\u300d\u932f\u8aa4\uff1f<\/h2>\n<p>\u70ba\u4e86\u89e3\u6c7a\u9019\u500b\u554f\u984c\uff0c\u8acb\u6aa2\u67e5\u4f60\u7684 for-in \u8a9e\u53e5\uff0c\u78ba\u4fdd\u6b63\u78ba\u4f7f\u7528\u95dc\u9375\u5b57 <code>in<\/code>\u3002\u4ee5\u4e0b\u662f\u6b63\u78ba\u7684\u5beb\u6cd5\uff1a<\/p>\n<pre class=\"brush: swift\">\nfor item in collection { \/\/ \u6b63\u78ba\uff1a\u5305\u542b in \u95dc\u9375\u5b57\n    \/\/ \u5728\u9019\u88e1\u5c0d\u6bcf\u500b item \u9032\u884c\u64cd\u4f5c\n}\n<\/pre>\n<h2>\u5be6\u4f5c\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u5b8c\u6574\u7684 Swift \u7a0b\u5f0f\u78bc\u7bc4\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528 for-in \u8a9e\u53e5\u4f86\u904d\u6b77\u9663\u5217\uff1a<\/p>\n<pre class=\"brush: swift\">\nlet fruits = [\"Apple\", \"Banana\", \"Cherry\"]\nfor fruit in fruits {\n    print(\"\u6211\u559c\u6b61 \\(fruit)\")\n}\n<\/pre>\n<p>\u9019\u6bb5\u7a0b\u5f0f\u78bc\u5c07\u8f38\u51fa\uff1a<\/p>\n<pre>\n\u6211\u559c\u6b61 Apple\n\u6211\u559c\u6b61 Banana\n\u6211\u559c\u6b61 Cherry\n<\/pre>\n<h2>\u5ef6\u4f38\u61c9\u7528\uff1a\u4f7f\u7528 For-In \u904d\u6b77\u5b57\u5178<\/h2>\n<p>for-in \u8a9e\u53e5\u4e5f\u53ef\u4ee5\u7528\u4f86\u904d\u6b77\u5b57\u5178\u3002\u5728\u4ee5\u4e0b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u5c07\u4f7f\u7528 for-in \u4f86\u5217\u5370\u5b57\u5178\u4e2d\u7684\u9375\u548c\u503c\uff1a<\/p>\n<pre class=\"brush: swift\">\nlet scores = [\"Alice\": 90, \"Bob\": 80, \"Charlie\": 85]\nfor (name, score) in scores {\n    print(\"\\(name) \u7684\u5206\u6578\u662f \\(score)\")\n}\n<\/pre>\n<p>\u9019\u6bb5\u7a0b\u5f0f\u78bc\u5c07\u8f38\u51fa\uff1a<\/p>\n<pre>\nAlice \u7684\u5206\u6578\u662f 90\nBob \u7684\u5206\u6578\u662f 80\nCharlie \u7684\u5206\u6578\u662f 85\n<\/pre>\n<h2>\u7e3d\u7d50<\/h2>\n<p>\u5728 Swift \u4e2d\uff0cfor-in \u8a9e\u53e5\u662f\u975e\u5e38\u91cd\u8981\u4e14\u5e38\u7528\u7684\u8a9e\u6cd5\u3002\u4e86\u89e3\u5982\u4f55\u6b63\u78ba\u4f7f\u7528\u5b83\u4ee5\u53ca\u5982\u4f55\u6392\u9664\u300cExpected &#8216;in&#8217; in for-in statement\u300d\u932f\u8aa4\uff0c\u80fd\u5920\u5e6b\u52a9\u4f60\u5728\u7a0b\u5f0f\u958b\u767c\u4e2d\u66f4\u52a0\u9806\u5229\u3002\u5982\u679c\u4f60\u5728\u7de8\u5beb Swift \u7a0b\u5f0f\u6642\u9047\u5230\u9019\u500b\u932f\u8aa4\uff0c\u8acb\u6aa2\u67e5\u8a9e\u6cd5\u4e26\u78ba\u4fdd <code>in<\/code> \u95dc\u9375\u5b57\u7684\u6b63\u78ba\u4f7f\u7528\u3002<\/p>\n<h2>\u5e38\u898b\u554f\u984c\u89e3\u7b54 (Q&#038;A)<\/h2>\n<h3>Q1: \u70ba\u4ec0\u9ebc\u6211\u6703\u9047\u5230\u300cExpected &#8216;in&#8217; in for-in statement\u300d\u932f\u8aa4\uff1f<\/h3>\n<p>A1: \u9019\u901a\u5e38\u662f\u56e0\u70ba\u4f60\u5728 for-in \u8a9e\u53e5\u4e2d\u5fd8\u8a18\u52a0\u5165\u95dc\u9375\u5b57 <code>in<\/code> \u6240\u5c0e\u81f4\u7684\u3002\u8acb\u6aa2\u67e5\u4f60\u7684\u8a9e\u6cd5\u4e26\u78ba\u4fdd\u5305\u542b\u4e86 <code>in<\/code>\u3002<\/p>\n<h3>Q2: for-in \u8a9e\u53e5\u53ef\u4ee5\u7528\u4f86\u904d\u6b77\u54ea\u4e9b\u8cc7\u6599\u985e\u578b\uff1f<\/h3>\n<p>A2: for-in \u8a9e\u53e5\u53ef\u4ee5\u7528\u4f86\u904d\u6b77\u9663\u5217\u3001\u5b57\u5178\u3001\u96c6\u5408\u7b49\u5404\u7a2e\u53ef\u8fed\u4ee3\u7684\u96c6\u5408\u985e\u578b\u3002<\/p>\n<h3>Q3: \u5982\u4f55\u5728 for-in \u8a9e\u53e5\u4e2d\u4f7f\u7528\u7d22\u5f15\uff1f<\/h3>\n<p>A3: \u5982\u679c\u4f60\u9700\u8981\u4f7f\u7528\u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>enumerated()<\/code> \u65b9\u6cd5\u4f86\u7372\u53d6\u7d22\u5f15\u8207\u5143\u7d20\u7684\u914d\u5c0d\u3002\u4f8b\u5982\uff1a<\/p>\n<pre class=\"brush: swift\">\nlet array = [\"A\", \"B\", \"C\"]\nfor (index, value) in array.enumerated() {\n    print(\"\u7d22\u5f15 \\(index) \u7684\u503c\u662f \\(value)\")\n}\n<\/pre>\n<p>\u9019\u6a23\u4f60\u5c31\u80fd\u540c\u6642\u7372\u5f97\u5143\u7d20\u7684\u7d22\u5f15\u548c\u5c0d\u61c9\u7684\u503c\u4e86\u3002<\/p>\n<p>&#8212;<\/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-4183","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\/pcFK27-15t","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4183","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=4183"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4183\/revisions"}],"predecessor-version":[{"id":4184,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4183\/revisions\/4184"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=4183"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=4183"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=4183"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}