{"id":2163,"date":"2019-08-30T22:31:23","date_gmt":"2019-08-30T19:31:23","guid":{"rendered":"http:\/\/demensdeum.com\/blog\/?p=2163"},"modified":"2024-12-16T22:32:35","modified_gmt":"2024-12-16T19:32:35","slug":"pattern-delegate","status":"publish","type":"post","link":"https:\/\/demensdeum.com\/blog\/zh\/2019\/08\/30\/pattern-delegate\/","title":{"rendered":"\u59d4\u6258\u6a21\u5f0f"},"content":{"rendered":"<p>\u59d4\u6258\u6a21\u5f0f\u662f\u4e3b\u8981\u7684\u8bbe\u8ba1\u6a21\u5f0f\u4e4b\u4e00\u3002<br \/>\u5047\u8bbe\u6211\u4eec\u6b63\u5728\u5f00\u53d1\u4e00\u4e2a\u7406\u53d1\u5e97\u5e94\u7528\u7a0b\u5e8f\u3002\u8be5\u5e94\u7528\u7a0b\u5e8f\u6709\u4e00\u4e2a\u65e5\u5386\uff0c\u7528\u4e8e\u9009\u62e9\u8bb0\u5f55\u7684\u65e5\u671f\uff1b\u70b9\u51fb\u65e5\u671f\u5c06\u6253\u5f00\u4e00\u4e2a\u53ef\u4f9b\u9009\u62e9\u7684\u7406\u53d1\u5e08\u5217\u8868\u3002<br \/>\u8ba9\u6211\u4eec\u5b9e\u73b0\u4e00\u4e2a\u7b80\u5355\u7684\u7cfb\u7edf\u7ec4\u4ef6\u94fe\u63a5\uff0c\u4f7f\u7528\u6307\u5411\u5f7c\u6b64\u7684\u6307\u9488\u5c06\u65e5\u5386\u548c\u5c4f\u5e55\u7ed3\u5408\u8d77\u6765\uff0c\u5b9e\u73b0\u5217\u8868\u663e\u793a\uff1a<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-unknown\" data-lang=\"unknown\"><code>\n\/\/ \u043f\u0441\u0435\u0432\u0434\u043e\u043a\u043e\u0434\n\nclass BarbershopScreen {\n   let calendar: Calendar\n\n   func showBarbersList(date: Date) {\n      showSelectionSheet(barbers(forDate: date))\n   }\n}\n\nclass Calendar {\n    let screen: BarbershopScreen\n\n    func handleTap(on date: Date) {\n        screen.showBarbersList(date: date)\n    }\n}\n<\/code><\/pre>\n<\/div>\n<p>\u51e0\u5929\u540e\uff0c\u8981\u6c42\u53d1\u751f\u53d8\u5316\uff1b\u5728\u663e\u793a\u5217\u8868\u4e4b\u524d\uff0c\u60a8\u9700\u8981\u663e\u793a\u5305\u542b\u591a\u79cd\u670d\u52a1\u9009\u62e9\uff08\u80e1\u987b\u4fee\u526a\u7b49\uff09\u7684\u4f18\u60e0\uff0c\u4f46\u5e76\u975e\u603b\u662f\u5982\u6b64\uff0c\u9664\u4e86\u5468\u516d\u4e4b\u5916\u7684\u6240\u6709\u65e5\u5b50\u3002<br \/>\u6211\u4eec\u5411\u65e5\u5386\u6dfb\u52a0\u4e00\u4e2a\u68c0\u67e5\u662f\u5426\u662f\u661f\u671f\u516d\u7684\u68c0\u67e5\uff0c\u6839\u636e\u5b83\uff0c\u6211\u4eec\u8c03\u7528\u7406\u53d1\u5e08\u5217\u8868\u6216\u670d\u52a1\u5217\u8868\u7684\u65b9\u6cd5\uff0c\u4e3a\u4e86\u6e05\u695a\u8d77\u89c1\uff0c\u6211\u5c06\u6f14\u793a\uff1a<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-unknown\" data-lang=\"unknown\"><code>\n\/\/ \u043f\u0441\u0435\u0432\u0434\u043e\u043a\u043e\u0434\n\nclass BarbershopScreen {\n   let calendar: Calendar\n\n   func showBarbersList(date: Date) {\n      showSelectionSheet(barbers(forDate: date))\n   }\n\n   func showOffersList() {\n      showSelectionSheet(offers)\n   }\n}\n\nclass Calendar {\n    let screen: BarbershopScreen\n\n    func handleTap(on date: Date)  {\n        if date.day != .saturday {\n             screen.showOffersList()\n        }\n        else {\n             screen.showBarbersList(date: date)\n        }\n    }\n}\n<\/code><\/pre>\n<\/div>\n<p>\u4e00\u5468\u540e\uff0c\u6211\u4eec\u88ab\u8981\u6c42\u5728\u53cd\u9988\u5c4f\u5e55\u4e0a\u6dfb\u52a0\u65e5\u5386\uff0c\u5c31\u5728\u90a3\u65f6\uff0c\u7b2c\u4e00\u4e2a\u67b6\u6784\u95ee\u9898\u53d1\u751f\u4e86\uff01<br \/>\u8be5\u600e\u4e48\u529e\uff1f\u65e5\u5386\u4e0e\u7406\u53d1\u9884\u7ea6\u5c4f\u5e55\u7d27\u5bc6\u76f8\u8fde\u3002<br \/>\u54c7\uff01\u554a\uff01\u54e6\u54e6<br \/>\u5982\u679c\u60a8\u7ee7\u7eed\u4f7f\u7528\u8fd9\u4e2a\u75af\u72c2\u7684\u5e94\u7528\u7a0b\u5e8f\u67b6\u6784\uff0c\u60a8\u5e94\u8be5\u590d\u5236\u6574\u4e2a\u65e5\u5386\u7c7b\u5e76\u5c06\u6b64\u526f\u672c\u4e0e\u53cd\u9988\u5c4f\u5e55\u76f8\u5173\u8054\u3002<br \/>\u597d\u5427\uff0c\u770b\u8d77\u6765\u4e0d\u9519\uff0c\u7136\u540e\u6211\u4eec\u53c8\u6dfb\u52a0\u4e86\u51e0\u4e2a\u5c4f\u5e55\u548c\u51e0\u4efd\u65e5\u5386\uff0c\u7136\u540e X \u65f6\u523b\u5c31\u6765\u4e86\u3002\u6211\u4eec\u88ab\u8981\u6c42\u66f4\u6539\u65e5\u5386\u7684\u8bbe\u8ba1\uff0c\u8fd9\u610f\u5473\u7740\u73b0\u5728\u6211\u4eec\u9700\u8981\u627e\u5230\u65e5\u5386\u7684\u6240\u6709\u526f\u672c\u5e76\u5bf9\u6240\u6709\u526f\u672c\u6dfb\u52a0\u76f8\u540c\u7684\u66f4\u6539\u3002\u8fd9\u79cd\u201c\u505a\u6cd5\u201d\u6781\u5927\u5730\u5f71\u54cd\u4e86\u5f00\u53d1\u901f\u5ea6\uff0c\u4e5f\u589e\u52a0\u4e86\u51fa\u9519\u7684\u673a\u4f1a\u3002\u7ed3\u679c\uff0c\u8fd9\u6837\u7684\u9879\u76ee\u6700\u7ec8\u4f1a\u9677\u5165\u5d29\u6e83\u72b6\u6001\uff0c\u751a\u81f3\u539f\u59cb\u67b6\u6784\u7684\u4f5c\u8005\u4e5f\u4e0d\u518d\u7406\u89e3\u4ed6\u7684\u7c7b\u7684\u526f\u672c\u662f\u5982\u4f55\u5de5\u4f5c\u7684\uff0c\u5e76\u4e14\u6cbf\u9014\u6dfb\u52a0\u7684\u5176\u4ed6\u9ed1\u5ba2\u4e5f\u4f1a\u7acb\u5373\u5d29\u6e83\u3002<br \/>\u9700\u8981\u505a\u4ec0\u4e48\uff0c\u6216\u8005\u66f4\u597d\u7684\u662f\uff0c\u73b0\u5728\u5f00\u59cb\u505a\u4ec0\u4e48\u8fd8\u4e0d\u7b97\u592a\u665a\uff1f\u4f7f\u7528\u59d4\u6258\u6a21\u5f0f\uff01<br \/>\u59d4\u6258\u662f\u4e00\u79cd\u901a\u8fc7\u516c\u5171\u63a5\u53e3\u4f20\u9012\u7c7b\u4e8b\u4ef6\u7684\u65b9\u6cd5\u3002\u4e0b\u9762\u662f\u65e5\u5386\u59d4\u6258\u7684\u793a\u4f8b\uff1a<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-unknown\" data-lang=\"unknown\"><code>protocol CalendarDelegate {\n   func calendar(_ calendar: Calendar, didSelect date: Date)\n}\n<\/code><\/pre>\n<\/div>\n<p>\u73b0\u5728\u8ba9\u6211\u4eec\u5c06\u4f7f\u7528\u59d4\u6258\u7684\u4ee3\u7801\u6dfb\u52a0\u5230\u793a\u4f8b\u4ee3\u7801\u4e2d\uff1a<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-unknown\" data-lang=\"unknown\"><code>\n\/\/ \u043f\u0441\u0435\u0432\u0434\u043e\u043a\u043e\u0434\n\nclass BarbershopScreen: CalendarDelegate {\n   let calendar: Calendar\n\n   init() {\n       calendar.delegate = self\n   }\n\n   func calendar(_ calendar: Calendar, didSelect date: Date) {\n        if date.day != .saturday {\n            showOffersList()\n        }\n        else {\n             showBarbersList(date: date)\n        }\n   }\n\n   func showBarbersList(date: Date) {\n      showSelectionSheet(barbers(forDate: date))\n   }\n\n   func showOffersList() {\n      showSelectionSheet(offers)\n   }\n}\n\nclass Calendar {\n    weak var delegate: CalendarDelegate\n\n    func handleTap(on date: Date)  {\n        delegate?.calendar(self, didSelect: date)\n    }\n}\n<\/code><\/pre>\n<\/div>\n<p>\u8fd9\u6837\u4e00\u6765\uff0c\u6211\u4eec\u5c31\u5c06\u65e5\u5386\u4e0e\u5c4f\u5e55\u5b8c\u5168\u89e3\u5f00\u4e86\uff0c\u5f53\u4ece\u65e5\u5386\u4e2d\u9009\u62e9\u65e5\u671f\u65f6\uff0c\u5b83\u4f1a\u4f20\u8f93\u65e5\u671f\u9009\u62e9\u4e8b\u4ef6&#8211; *\u5c06\u4e8b\u4ef6\u5904\u7406\u59d4\u6258\u7ed9\u8ba2\u9605\u8005\uff1b\u8ba2\u9605\u8005\u5c31\u662f\u5c4f\u5e55\u3002<br \/>\u6211\u4eec\u4ece\u8fd9\u79cd\u65b9\u6cd5\u4e2d\u5f97\u5230\u4ec0\u4e48\u597d\u5904\uff1f\u73b0\u5728\u6211\u4eec\u53ef\u4ee5\u72ec\u7acb\u5730\u66f4\u6539\u65e5\u5386\u548c\u5c4f\u5e55\u903b\u8f91\uff0c\u800c\u65e0\u9700\u91cd\u590d\u7c7b\uff0c\u4ece\u800c\u7b80\u5316\u4e86\u8fdb\u4e00\u6b65\u7684\u652f\u6301\uff1b\u8fd9\u6837\u5c31\u5b9e\u73b0\u4e86\u7cfb\u7edf\u7ec4\u4ef6\u5b9e\u73b0\u7684\u201c\u5168\u8d23\u539f\u5219\u201d\uff0c\u9075\u5b88\u4e86DRY\u539f\u5219\u3002<br \/>\u4f7f\u7528\u59d4\u6258\u65f6\uff0c\u60a8\u53ef\u4ee5\u6dfb\u52a0\u3001\u66f4\u6539\u663e\u793a\u7a97\u53e3\u7684\u903b\u8f91\u3001\u5c4f\u5e55\u4e0a\u4efb\u4f55\u5185\u5bb9\u7684\u987a\u5e8f\uff0c\u8fd9\u5b8c\u5168\u4e0d\u4f1a\u5f71\u54cd\u65e5\u5386\u548c\u5176\u4ed6\u7c7b\uff0c\u5ba2\u89c2\u4e0a\u5b83\u4eec\u4e0d\u5e94\u8be5\u53c2\u4e0e\u4e0e\u5b83\u4eec\u4e0d\u76f4\u63a5\u76f8\u5173\u7684\u8fdb\u7a0b\u3002< br\/>\u6216\u8005\uff0c\u4e0d\u592a\u6253\u6270\u81ea\u5df1\u7684\u7a0b\u5e8f\u5458\u53ef\u4ee5\u4f7f\u7528\u901a\u8fc7\u516c\u5171\u603b\u7ebf\u53d1\u9001\u6d88\u606f\uff0c\u800c\u4e0d\u9700\u8981\u7f16\u5199\u5355\u72ec\u7684\u534f\u8bae\/\u59d4\u6258\u63a5\u53e3\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u6700\u597d\u4f7f\u7528\u59d4\u6258\u3002\u6211\u5728\u4e0a\u4e00\u7bc7\u6587\u7ae0\u4e2d\u5199\u8fc7\u8fd9\u79cd\u65b9\u6cd5\u7684\u7f3a\u70b9&#8211; \u201c\u89c2\u5bdf\u8005\u6a21\u5f0f\u3002\u201d<\/p>\n<h3>\u6765\u6e90<\/h3>\n<p><a href=\"https:\/\/refactoring.guru\/ru\/replace-inheritance-with-delegation\" target=\"_blank\" rel=\"noopener\">https:\/\/refactoring.guru\/ru\/replace-inheritance -with-delegation<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u59d4\u6258\u6a21\u5f0f\u662f\u4e3b\u8981\u7684\u8bbe\u8ba1\u6a21\u5f0f\u4e4b\u4e00\u3002\u5047\u8bbe\u6211\u4eec\u6b63\u5728\u5f00\u53d1\u4e00\u4e2a\u7406\u53d1\u5e97\u5e94\u7528\u7a0b\u5e8f\u3002\u8be5\u5e94\u7528\u7a0b\u5e8f\u6709\u4e00\u4e2a\u65e5\u5386\uff0c\u7528\u4e8e\u9009\u62e9\u8bb0\u5f55\u7684\u65e5\u671f\uff1b\u70b9\u51fb\u65e5\u671f\u5c06\u6253\u5f00\u4e00\u4e2a\u53ef\u4f9b\u9009\u62e9\u7684\u7406\u53d1\u5e08\u5217\u8868\u3002\u8ba9\u6211\u4eec\u5b9e\u73b0\u4e00\u4e2a\u7b80\u5355\u7684\u7cfb\u7edf\u7ec4\u4ef6\u94fe\u63a5\uff0c\u4f7f\u7528\u6307\u5411\u5f7c\u6b64\u7684\u6307\u9488\u5c06\u65e5\u5386\u548c\u5c4f\u5e55\u7ed3\u5408\u8d77\u6765\uff0c\u5b9e\u73b0\u5217\u8868\u663e\u793a\uff1a \/\/ \u043f\u0441\u0435\u0432\u0434\u043e\u043a\u043e\u0434 class BarbershopScreen { let calendar: Calendar func showBarbersList(date: Date) { showSelectionSheet(barbers(forDate: date)) } } class Calendar { let screen: BarbershopScreen func handleTap(on date: Date) { screen.showBarbersList(date: date) } } \u51e0\u5929\u540e\uff0c\u8981\u6c42\u53d1\u751f\u53d8\u5316\uff1b\u5728\u663e\u793a\u5217\u8868\u4e4b\u524d\uff0c\u60a8\u9700\u8981\u663e\u793a\u5305\u542b\u591a\u79cd\u670d\u52a1\u9009\u62e9\uff08\u80e1\u987b\u4fee\u526a\u7b49\uff09\u7684\u4f18\u60e0\uff0c\u4f46\u5e76\u975e\u603b\u662f\u5982\u6b64\uff0c\u9664\u4e86\u5468\u516d\u4e4b\u5916\u7684\u6240\u6709\u65e5\u5b50\u3002\u6211\u4eec\u5411\u65e5\u5386\u6dfb\u52a0\u4e00\u4e2a\u68c0\u67e5\u662f\u5426\u662f\u661f\u671f\u516d\u7684\u68c0\u67e5\uff0c\u6839\u636e\u5b83\uff0c\u6211\u4eec\u8c03\u7528\u7406\u53d1\u5e08\u5217\u8868\u6216\u670d\u52a1\u5217\u8868\u7684\u65b9\u6cd5\uff0c\u4e3a\u4e86\u6e05\u695a\u8d77\u89c1\uff0c\u6211\u5c06\u6f14\u793a\uff1a \/\/ \u043f\u0441\u0435\u0432\u0434\u043e\u043a\u043e\u0434 class BarbershopScreen { let calendar: Calendar func showBarbersList(date: Date) { showSelectionSheet(barbers(forDate: date)) } func showOffersList() { showSelectionSheet(offers) } } class<a class=\"more-link\" href=\"https:\/\/demensdeum.com\/blog\/zh\/2019\/08\/30\/pattern-delegate\/\">Continue reading <span class=\"screen-reader-text\">&#8220;\u59d4\u6258\u6a21\u5f0f&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[61,52],"tags":[114,95],"class_list":["post-2163","post","type-post","status-publish","format-standard","hentry","category-techie","category-tutorials","tag-delegate","tag-patterns","entry"],"translation":{"provider":"WPGlobus","version":"3.0.2","language":"zh","enabled_languages":["en","ru","zh","de","fr","ja","pt","hi"],"languages":{"en":{"title":true,"content":true,"excerpt":false},"ru":{"title":true,"content":true,"excerpt":false},"zh":{"title":true,"content":true,"excerpt":false},"de":{"title":true,"content":true,"excerpt":false},"fr":{"title":true,"content":true,"excerpt":false},"ja":{"title":true,"content":true,"excerpt":false},"pt":{"title":true,"content":true,"excerpt":false},"hi":{"title":false,"content":false,"excerpt":false}}},"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/demensdeum.com\/blog\/zh\/wp-json\/wp\/v2\/posts\/2163","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/demensdeum.com\/blog\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/demensdeum.com\/blog\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/demensdeum.com\/blog\/zh\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/demensdeum.com\/blog\/zh\/wp-json\/wp\/v2\/comments?post=2163"}],"version-history":[{"count":6,"href":"https:\/\/demensdeum.com\/blog\/zh\/wp-json\/wp\/v2\/posts\/2163\/revisions"}],"predecessor-version":[{"id":3946,"href":"https:\/\/demensdeum.com\/blog\/zh\/wp-json\/wp\/v2\/posts\/2163\/revisions\/3946"}],"wp:attachment":[{"href":"https:\/\/demensdeum.com\/blog\/zh\/wp-json\/wp\/v2\/media?parent=2163"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/demensdeum.com\/blog\/zh\/wp-json\/wp\/v2\/categories?post=2163"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/demensdeum.com\/blog\/zh\/wp-json\/wp\/v2\/tags?post=2163"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}