{"id":6409,"date":"2024-08-02T07:51:19","date_gmt":"2024-08-01T23:51:19","guid":{"rendered":"https:\/\/t.n-years.com\/?p=6409"},"modified":"2024-08-02T07:51:19","modified_gmt":"2024-08-01T23:51:19","slug":"swift-convenience-%e6%9e%84%e9%80%a0%e6%96%b9%e6%b3%95%e5%8f%8a%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a1%b9","status":"publish","type":"post","link":"https:\/\/t.n-years.com\/?p=6409","title":{"rendered":"Swift convenience \u6784\u9020\u65b9\u6cd5\u53ca\u6ce8\u610f\u4e8b\u9879"},"content":{"rendered":"<blockquote>\n<p>\u975e\u539f\u521b\u3001ChatGPT \u95ee\u7b54\u751f\u6210<\/p>\n<\/blockquote>\n<p>\u5728 Swift \u4e2d\uff0c\u6784\u9020\u65b9\u6cd5\uff08initializer\uff09\u6709\u4e24\u79cd\u4e3b\u8981\u7c7b\u578b\uff1a<strong>\u4fbf\u5229\u6784\u9020\u65b9\u6cd5<\/strong>\uff08convenience initializer\uff09\u548c<strong>\u6307\u5b9a\u6784\u9020\u65b9\u6cd5<\/strong>\uff08designated initializer\uff09\u3002\u5b83\u4eec\u5404\u81ea\u6709\u4e0d\u540c\u7684\u7528\u9014\u548c\u89c4\u5219\u3002\u4e0b\u9762\u662f\u5b83\u4eec\u7684\u4e3b\u8981\u533a\u522b\u548c\u6ce8\u610f\u4e8b\u9879\uff1a<\/p>\n<h3>\u6307\u5b9a\u6784\u9020\u65b9\u6cd5 (Designated Initializer)<\/h3>\n<ul>\n<li><strong>\u5b9a\u4e49<\/strong>\uff1a\u6307\u5b9a\u6784\u9020\u65b9\u6cd5\u662f\u4e00\u4e2a\u7c7b\u7684\u4e3b\u8981\u6784\u9020\u65b9\u6cd5\u3002\u5b83\u8d1f\u8d23\u521d\u59cb\u5316\u7c7b\u7684\u6240\u6709\u5c5e\u6027\uff0c\u5e76\u8c03\u7528\u5176\u7236\u7c7b\u7684\u6307\u5b9a\u6784\u9020\u65b9\u6cd5\u3002<\/li>\n<li><strong>\u804c\u8d23<\/strong>\uff1a\u5b83\u5fc5\u987b\u5b8c\u5168\u521d\u59cb\u5316\u81ea\u8eab\u6240\u58f0\u660e\u7684\u6240\u6709\u5c5e\u6027\uff0c\u5e76\u4e14\u901a\u5e38\u4f1a\u8c03\u7528\u7236\u7c7b\u7684\u6307\u5b9a\u6784\u9020\u65b9\u6cd5\u6765\u786e\u4fdd\u7ee7\u627f\u94fe\u7684\u6b63\u786e\u521d\u59cb\u5316\u3002<\/li>\n<li><strong>\u5b9e\u73b0<\/strong>\uff1a\u6bcf\u4e2a\u7c7b\u81f3\u5c11\u9700\u8981\u4e00\u4e2a\u6307\u5b9a\u6784\u9020\u65b9\u6cd5\u3002<\/li>\n<\/ul>\n<h3>\u4fbf\u5229\u6784\u9020\u65b9\u6cd5 (Convenience Initializer)<\/h3>\n<ul>\n<li><strong>\u5b9a\u4e49<\/strong>\uff1a\u4fbf\u5229\u6784\u9020\u65b9\u6cd5\u662f\u4e00\u4e2a\u8f85\u52a9\u6784\u9020\u65b9\u6cd5\u3002\u5b83\u662f\u5bf9\u6307\u5b9a\u6784\u9020\u65b9\u6cd5\u7684\u8865\u5145\uff0c\u4e3b\u8981\u7528\u4e8e\u7b80\u5316\u5bf9\u8c61\u7684\u521b\u5efa\u8fc7\u7a0b\u3002<\/li>\n<li><strong>\u804c\u8d23<\/strong>\uff1a\u5b83\u901a\u5e38\u4f1a\u8c03\u7528\u540c\u4e00\u7c7b\u4e2d\u7684\u5176\u4ed6\u6784\u9020\u65b9\u6cd5\uff08\u53ef\u80fd\u662f\u6307\u5b9a\u6784\u9020\u65b9\u6cd5\uff09\u6765\u5b8c\u6210\u521d\u59cb\u5316\u4efb\u52a1\u3002<\/li>\n<li><strong>\u5b9e\u73b0<\/strong>\uff1a\u4fbf\u5229\u6784\u9020\u65b9\u6cd5\u5fc5\u987b\u8c03\u7528\u540c\u4e00\u7c7b\u4e2d\u7684\u53e6\u4e00\u4e2a\u6784\u9020\u65b9\u6cd5\uff0c\u5e76\u4e14\u6700\u7ec8\u4f1a\u8c03\u7528\u7236\u7c7b\u7684\u6307\u5b9a\u6784\u9020\u65b9\u6cd5\u3002<\/li>\n<\/ul>\n<h3>\u6ce8\u610f\u4e8b\u9879<\/h3>\n<ol>\n<li>\n<p><strong>\u8c03\u7528\u94fe<\/strong>\uff1a\u4fbf\u5229\u6784\u9020\u65b9\u6cd5\u5fc5\u987b\u8c03\u7528\u540c\u4e00\u7c7b\u4e2d\u7684\u5176\u4ed6\u6784\u9020\u65b9\u6cd5\uff0c\u800c\u6307\u5b9a\u6784\u9020\u65b9\u6cd5\u5fc5\u987b\u8c03\u7528\u5176\u7236\u7c7b\u7684\u6307\u5b9a\u6784\u9020\u65b9\u6cd5\u3002\u6240\u6709\u6784\u9020\u65b9\u6cd5\u6700\u7ec8\u90fd\u9700\u8981\u8c03\u7528\u7236\u7c7b\u7684\u6784\u9020\u65b9\u6cd5\u6765\u5b8c\u6210\u521d\u59cb\u5316\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u521d\u59cb\u5316\u987a\u5e8f<\/strong>\uff1a\u5728\u521b\u5efa\u5bf9\u8c61\u65f6\uff0cSwift \u4f1a\u9996\u5148\u8c03\u7528\u7236\u7c7b\u7684\u6784\u9020\u65b9\u6cd5\uff0c\u7136\u540e\u624d\u8c03\u7528\u5b50\u7c7b\u7684\u6784\u9020\u65b9\u6cd5\u3002\u56e0\u6b64\uff0c\u786e\u4fdd\u7236\u7c7b\u7684\u6784\u9020\u65b9\u6cd5\u6b63\u786e\u521d\u59cb\u5316\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u6807\u8bb0<\/strong>\uff1a\u5728 Swift \u4e2d\uff0c\u4fbf\u5229\u6784\u9020\u65b9\u6cd5\u4f7f\u7528 <code>convenience<\/code> \u5173\u952e\u5b57\u6807\u8bb0\uff0c\u800c\u6307\u5b9a\u6784\u9020\u65b9\u6cd5\u5219\u4e0d\u9700\u8981\u7279\u6b8a\u7684\u6807\u8bb0\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u8bbe\u8ba1\u539f\u5219<\/strong>\uff1a\u5c06\u516c\u5171\u521d\u59cb\u5316\u903b\u8f91\u653e\u5728\u6307\u5b9a\u6784\u9020\u65b9\u6cd5\u4e2d\uff0c\u5c06\u7b80\u5316\u521d\u59cb\u5316\u903b\u8f91\u653e\u5728\u4fbf\u5229\u6784\u9020\u65b9\u6cd5\u4e2d\u3002\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u91cd\u590d\u4ee3\u7801\uff0c\u5e76\u4fdd\u6301\u4ee3\u7801\u7684\u6e05\u6670\u548c\u53ef\u7ef4\u62a4\u3002<\/p>\n<\/li>\n<\/ol>\n<h3>\u793a\u4f8b<\/h3>\n<pre><code class=\"language-swift\">class Person {\n    var name: String\n    var age: Int\n\n    \/\/ \u6307\u5b9a\u6784\u9020\u65b9\u6cd5\n    init(name: String, age: Int) {\n        self.name = name\n        self.age = age\n    }\n\n    \/\/ \u4fbf\u5229\u6784\u9020\u65b9\u6cd5\n    convenience init(name: String) {\n        self.init(name: name, age: 0) \/\/ \u8c03\u7528\u6307\u5b9a\u6784\u9020\u65b9\u6cd5\n    }\n}<\/code><\/pre>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c<code>init(name: String, age: Int)<\/code> \u662f\u6307\u5b9a\u6784\u9020\u65b9\u6cd5\uff0c\u8d1f\u8d23\u5b8c\u5168\u521d\u59cb\u5316 <code>Person<\/code> \u5b9e\u4f8b\u3002<code>init(name: String)<\/code> \u662f\u4fbf\u5229\u6784\u9020\u65b9\u6cd5\uff0c\u5b83\u8c03\u7528\u4e86\u6307\u5b9a\u6784\u9020\u65b9\u6cd5\u5e76\u63d0\u4f9b\u4e86\u9ed8\u8ba4\u503c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u975e\u539f\u521b\u3001ChatGPT \u95ee\u7b54\u751f\u6210 \u5728 Swift \u4e2d\uff0c\u6784\u9020\u65b9\u6cd5\uff08initializer\uff09\u6709\u4e24\u79cd\u4e3b\u8981\u7c7b\u578b\uff1a\u4fbf\u5229\u6784&#8230; <\/p>\n<div class=\"read-more navbutton\"><a href=\"https:\/\/t.n-years.com\/?p=6409\">\u9605\u8bfb\u66f4\u591a<i class=\"fa fa-angle-double-right\"><\/i><\/a><\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[135],"tags":[67],"class_list":["post-6409","post","type-post","status-publish","format-standard","hentry","category-135","tag-swift"],"_links":{"self":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts\/6409","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6409"}],"version-history":[{"count":1,"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts\/6409\/revisions"}],"predecessor-version":[{"id":6410,"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts\/6409\/revisions\/6410"}],"wp:attachment":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6409"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6409"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6409"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}