{"id":3862,"date":"2025-05-30T13:50:26","date_gmt":"2025-06-04T06:02:26","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=3862"},"modified":"2025-06-04T13:50:26","modified_gmt":"2025-06-04T06:02:26","slug":"%e5%ad%b8%e7%bf%92%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8swift%e4%b8%ad%e7%9a%84%e9%81%b8%e9%a0%85%e5%9e%8b%ef%bc%9a%e5%8f%af%e9%81%b8%e5%9e%8b%e3%80%81%e9%9a%b1%e5%bc%8f%e8%a7%a3%e6%9e%90%e5%8f%af","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/swift\/%e5%ad%b8%e7%bf%92%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8swift%e4%b8%ad%e7%9a%84%e9%81%b8%e9%a0%85%e5%9e%8b%ef%bc%9a%e5%8f%af%e9%81%b8%e5%9e%8b%e3%80%81%e9%9a%b1%e5%bc%8f%e8%a7%a3%e6%9e%90%e5%8f%af\/","title":{"rendered":"\u6df1\u5165\u4e86\u89e3Swift\u4e2d\u7684\u9078\u9805\u578b\uff1a\u53ef\u9078\u578b\u8207\u96b1\u5f0f\u89e3\u6790\u53ef\u9078\u578b\u7684\u5be6\u7528\u6307\u5357"},"content":{"rendered":"

<\/p>\n

\u6df1\u5165\u4e86\u89e3Swift\u4e2d\u7684\u9078\u9805\u578b\uff1a\u53ef\u9078\u578b\u8207\u96b1\u5f0f\u89e3\u6790\u53ef\u9078\u578b\u7684\u5be6\u7528\u6307\u5357<\/h1>\n

Swift\u662f\u4e00\u7a2e\u73fe\u4ee3\u7684\u7a0b\u5f0f\u8a9e\u8a00\uff0c\u64c1\u6709\u8a31\u591a\u5f37\u5927\u7684\u529f\u80fd\uff0c\u5176\u4e2d\u4e4b\u4e00\u4fbf\u662f\u9078\u9805\u578b\u3002\u9078\u9805\u578b\u4f5c\u70ba\u4e00\u7a2e\u7279\u6b8a\u7684\u8cc7\u6599\u985e\u578b\uff0c\u7528\u4f86\u8868\u793a\u53ef\u80fd\u5b58\u5728\u6216\u4e0d\u5b58\u5728\u7684\u503c\uff0c\u70ba\u958b\u767c\u8005\u63d0\u4f9b\u4e86\u66f4\u9ad8\u7684\u9748\u6d3b\u6027\u548c\u5b89\u5168\u6027\u3002\u5728Swift\u4e2d\uff0c\u4e3b\u8981\u6709\u5169\u7a2e\u985e\u578b\u7684\u9078\u9805\u578b\uff1a\u53ef\u9078\u578b\u548c\u96b1\u5f0f\u89e3\u6790\u53ef\u9078\u578b\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u5169\u8005\u7684\u7528\u6cd5\u548c\u6700\u4f73\u5be6\u8e10\u3002<\/p>\n

\u53ef\u9078\u578b\uff1a\u5b89\u5168\u6027\u8207\u9748\u6d3b\u6027\u7684\u7d50\u5408<\/h2>\n

\u53ef\u9078\u578b\u662fSwift\u4e2d\u6700\u5e38\u898b\u7684\u9078\u9805\u578b\uff0c\u5141\u8a31\u8b8a\u6578\u6709\u53ef\u80fd\u4e0d\u6301\u6709\u4efb\u4f55\u503c\u3002\u5b83\u7684\u503c\u53ef\u4ee5\u662f\u4efb\u4f55\u985e\u578b\uff0c\u5305\u62ec\u57fa\u672c\u985e\u578b\uff08\u5982\u6574\u6578\u3001\u6d6e\u9ede\u6578\u548c\u5b57\u4e32\uff09\u4ee5\u53ca\u8907\u96dc\u985e\u578b\uff08\u5982\u9663\u5217\u548c\u5b57\u5178\uff09\u3002<\/p>\n

\u5728Swift\u4e2d\uff0c\u4f7f\u7528\u95dc\u9375\u5b57nil<\/code>\u4f86\u8868\u793a\u4e0d\u5b58\u5728\u7684\u503c\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u5ba3\u544a\u4e00\u500b\u53ef\u9078\u578b\u7684\u6574\u6578\u8b8a\u6578\u4e26\u5c07\u5176\u521d\u59cb\u503c\u8a2d\u70banil<\/code>\u7684\u7bc4\u4f8b\uff1a<\/p>\n

\nvar optionalInteger: Int? = nil\n<\/pre>\n
\u8981\u6aa2\u67e5\u53ef\u9078\u578b\u7684\u503c\u662f\u5426\u5b58\u5728\uff0c\u53ef\u4ee5\u4f7f\u7528if let<\/code>\u8a9e\u53e5\uff0c\u9019\u6a23\u53ef\u4ee5\u5b89\u5168\u5730\u8655\u7406\u503c\u7684\u89e3\u5305\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u7a0b\u5f0f\u78bc\u6aa2\u67e5optionalInteger<\/code>\u662f\u5426\u5b58\u5728\uff0c\u4e26\u5728\u5b58\u5728\u503c\u7684\u60c5\u6cc1\u4e0b\u5c07\u5176\u52a01\uff1a<\/p>\n
\nif let value = optionalInteger {\n    optionalInteger = value + 1\n}\n<\/pre>\n
\u96b1\u5f0f\u89e3\u6790\u53ef\u9078\u578b\uff1a\u7c21\u5316\u7a0b\u5f0f\u78bc\u7684\u9078\u64c7<\/h2>\n
\u96b1\u5f0f\u89e3\u6790\u53ef\u9078\u578b\u662f\u53e6\u4e00\u7a2e\u9078\u9805\u578b\uff0c\u8207\u53ef\u9078\u578b\u985e\u4f3c\uff0c\u4f46\u5b83\u5141\u8a31\u4f60\u5728\u4e0d\u9700\u8981\u7de8\u5beb\u984d\u5916\u6aa2\u67e5\u7684\u60c5\u6cc1\u4e0b\u76f4\u63a5\u4f7f\u7528\u8b8a\u6578\u3002\u9019\u7a2e\u7279\u6027\u8b93\u7a0b\u5f0f\u78bc\u66f4\u7c21\u6f54\uff0c\u4f46\u4e5f\u4f34\u96a8\u8457\u4e00\u5b9a\u7684\u98a8\u96aa\u3002<\/p>\n
\u4ee5\u4e0b\u662f\u5982\u4f55\u5ba3\u544a\u4e00\u500b\u96b1\u5f0f\u89e3\u6790\u53ef\u9078\u578b\u7684\u6574\u6578\u8b8a\u6578\u4e26\u5c07\u5176\u521d\u59cb\u503c\u8a2d\u70banil<\/code>\u7684\u7bc4\u4f8b\uff1a<\/p>\n
\nvar implicitOptionalInteger: Int! = nil\n<\/pre>\n
\u5728\u76f4\u63a5\u4f7f\u7528\u96b1\u5f0f\u89e3\u6790\u53ef\u9078\u578b\u7684\u503c\u6642\uff0c\u4e0d\u518d\u9700\u8981if let<\/code>\u8a9e\u53e5\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u7a0b\u5f0f\u78bc\u5c07implicitOptionalInteger<\/code>\u7684\u503c\u52a01\uff1a<\/p>\n
\nimplicitOptionalInteger = implicitOptionalInteger + 1\n<\/pre>\n
\u96d6\u7136\u4f7f\u7528\u96b1\u5f0f\u89e3\u6790\u53ef\u9078\u578b\u53ef\u4ee5\u7c21\u5316\u7a0b\u5f0f\u78bc\uff0c\u4f46\u958b\u767c\u8005\u61c9\u8b39\u614e\u4f7f\u7528\uff0c\u56e0\u70ba\u5982\u679c\u5728\u672a\u521d\u59cb\u5316\u7684\u60c5\u6cc1\u4e0b\u4f7f\u7528\uff0c\u5c07\u5c0e\u81f4\u7a0b\u5f0f\u5d29\u6f70\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u6df1\u5165\u63a2\u8a0e\u4e86Swift\u4e2d\u7684\u9078\u9805\u578b\uff0c\u5305\u62ec\u53ef\u9078\u578b\u548c\u96b1\u5f0f\u89e3\u6790\u53ef\u9078\u578b\u3002\u53ef\u9078\u578b\u63d0\u4f9b\u4e86\u5b89\u5168\u5730\u8868\u793a\u53ef\u80fd\u4e0d\u5b58\u5728\u7684\u503c\u7684\u65b9\u5f0f\uff0c\u800c\u96b1\u5f0f\u89e3\u6790\u53ef\u9078\u578b\u5247\u7c21\u5316\u4e86\u7a0b\u5f0f\u78bc\u5beb\u6cd5\u3002\u9078\u64c7\u4f7f\u7528\u4f55\u7a2e\u9078\u9805\u578b\u6642\uff0c\u958b\u767c\u8005\u5fc5\u9808\u8a55\u4f30\u5176\u98a8\u96aa\u8207\u9700\u6c42\uff0c\u4e26\u6839\u64da\u60c5\u5883\u4f5c\u51fa\u660e\u667a\u7684\u9078\u64c7\u3002<\/p>\n
\u900f\u904e\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u77e5\u8b58\uff0c\u60a8\u5c07\u80fd\u5920\u5728Swift\u958b\u767c\u4e2d\u66f4\u6709\u6548\u5730\u7ba1\u7406\u9078\u9805\u578b\uff0c\u63d0\u9ad8\u7a0b\u5f0f\u78bc\u7684\u5b89\u5168\u6027\u548c\u53ef\u8b80\u6027\u3002
\n—<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6587\u7ae0\u6458\u8981\uff1a\u672c\u6587\u5c07\u4ecb\u7d39Swift\u4e2d\u7684\u9078\u9805\u578b\uff0c\u5305\u62ec\u53ef\u9078\u578b\u3001\u96b1\u5f0f\u89e3\u6790\u53ef\u9078\u578b\u7b49\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u6280\u5de7\uff0c\u8b93\u4f60\u53ef\u4ee5\u66f4\u8f15\u9b06\u5730\u4f7f\u7528\u5b83\u5011\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-3862","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\/pcFK27-10i","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3862","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=3862"}],"version-history":[{"count":2,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3862\/revisions"}],"predecessor-version":[{"id":3927,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3862\/revisions\/3927"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=3862"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=3862"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=3862"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}