{"id":512,"date":"2018-02-23T23:38:54","date_gmt":"2018-02-23T15:38:54","guid":{"rendered":"http:\/\/60.205.208.74\/2018\/02\/23\/swift-%e5%b8%b8%e9%87%8f\/"},"modified":"2018-02-23T23:38:54","modified_gmt":"2018-02-23T15:38:54","slug":"swift-%e5%b8%b8%e9%87%8f","status":"publish","type":"post","link":"https:\/\/www.puzi7.net\/?p=512","title":{"rendered":"Swift \u5e38\u91cf"},"content":{"rendered":"<span itemprop=\"description\"><div class=\"article-body\">\n<div class=\"article-intro\" id=\"content\">\n<h1>Swift \u5e38\u91cf<\/h1>\n<p>\u5e38\u91cf\u4e00\u65e6\u8bbe\u5b9a\uff0c\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6\u5c31\u65e0\u6cd5\u6539\u53d8\u5176\u503c\u3002<\/p>\n<p>\u5e38\u91cf\u53ef\u4ee5\u662f\u4efb\u4f55\u7684\u6570\u636e\u7c7b\u578b\u5982\uff1a\u6574\u578b\u5e38\u91cf\uff0c\u6d6e\u70b9\u578b\u5e38\u91cf\uff0c\u5b57\u7b26\u5e38\u91cf\u6216\u5b57\u7b26\u4e32\u5e38\u91cf\u3002\u540c\u6837\u4e5f\u6709\u679a\u4e3e\u7c7b\u578b\u7684\u5e38\u91cf\uff1a<\/p>\n<p>\n\u5e38\u91cf\u7c7b\u4f3c\u4e8e\u53d8\u91cf\uff0c\u533a\u522b\u5728\u4e8e\u5e38\u91cf\u7684\u503c\u4e00\u65e6\u8bbe\u5b9a\u5c31\u4e0d\u80fd\u6539\u53d8\uff0c\u800c\u53d8\u91cf\u7684\u503c\u53ef\u4ee5\u968f\u610f\u66f4\u6539\u3002<\/p>\n<hr>\n<h2>\u5e38\u91cf\u58f0\u660e<\/h2>\n<p>\u5e38\u91cf\u4f7f\u7528\u5173\u952e\u5b57 <b>let<\/b> \u6765\u58f0\u660e\uff0c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre>\nlet constantName = &lt;initial value&gt;\n<\/pre>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684 Swift \u7a0b\u5e8f\u4e2d\u4f7f\u7528\u5e38\u91cf\u7684\u5b9e\u4f8b\uff1a<\/p>\n<pre>\nimport Cocoa\n\nlet constA = 42\nprint(constA)\n<\/pre>\n<p>\u4ee5\u4e0a\u7a0b\u5e8f\u6267\u884c\u7ed3\u679c\u4e3a\uff1a<\/p>\n<pre>\n42\n<\/pre>\n<hr>\n<h2>\u7c7b\u578b\u6807\u6ce8<\/h2>\n<p>\u5f53\u4f60\u58f0\u660e\u5e38\u91cf\u6216\u8005\u53d8\u91cf\u7684\u65f6\u5019\u53ef\u4ee5\u52a0\u4e0a\u7c7b\u578b\u6807\u6ce8\uff08type annotation\uff09\uff0c\u8bf4\u660e\u5e38\u91cf\u6216\u8005\u53d8\u91cf\u4e2d\u8981\u5b58\u50a8\u7684\u503c\u7684\u7c7b\u578b\u3002\u5982\u679c\u8981\u6dfb\u52a0\u7c7b\u578b\u6807\u6ce8\uff0c\u9700\u8981\u5728\u5e38\u91cf\u6216\u8005\u53d8\u91cf\u540d\u540e\u9762\u52a0\u4e0a\u4e00\u4e2a\u5192\u53f7\u548c\u7a7a\u683c\uff0c\u7136\u540e\u52a0\u4e0a\u7c7b\u578b\u540d\u79f0\u3002\n<\/p>\n<pre>\nvar constantName:&lt;data type&gt; = &lt;optional initial value&gt;\n<\/pre>\n<p>\n\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u662f\u5b9e\u4f8b\u6f14\u793a\u4e86 Swift \u4e2d\u5e38\u91cf\u4f7f\u7528\u7c7b\u578b\u6807\u6ce8\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\u5e38\u91cf\u5b9a\u4e49\u65f6\u5fc5\u987b\u521d\u59cb\u503c\uff1a<\/p>\n<pre>\nimport Cocoa\n\nlet constA = 42\nprint(constA)\n\nlet constB:Float = 3.14159\n\nprint(constB)\n<\/pre>\n<p>\u4ee5\u4e0a\u7a0b\u5e8f\u6267\u884c\u7ed3\u679c\u4e3a\uff1a<\/p>\n<pre>\n42\n3.14159<\/pre>\n<hr>\n<h2>\u5e38\u91cf\u547d\u540d<\/h2>\n<p>\u5e38\u91cf\u7684\u547d\u540d\u53ef\u4ee5\u7531\u5b57\u6bcd\uff0c\u6570\u5b57\u548c\u4e0b\u5212\u7ebf\u7ec4\u6210\u3002<\/p>\n<p>\u5e38\u91cf\u9700\u8981\u4ee5\u5b57\u6bcd\u6216\u4e0b\u5212\u7ebf\u5f00\u59cb\u3002<\/p>\n<p>Swift \u662f\u4e00\u4e2a\u533a\u5206\u5927\u5c0f\u5199\u7684\u8bed\u8a00\uff0c\u6240\u4ee5\u5b57\u6bcd\u5927\u5199\u4e0e\u5c0f\u5199\u662f\u4e0d\u4e00\u6837\u7684\u3002<\/p>\n<p>\u5e38\u91cf\u540d\u4e5f\u53ef\u4ee5\u4f7f\u7528\u7b80\u5355\u7684 Unicode \u5b57\u7b26\uff0c\u5982\u4e0b\u5b9e\u4f8b\uff1a<\/p>\n<pre>\nimport Cocoa\n\nlet _const = \"Hello, Swift!\"\nprint(_const)\n\nlet \u4f60\u597d = \"\u4f60\u597d\u4e16\u754c\"\nprint(\u4f60\u597d)\n<\/pre>\n<p>\u4ee5\u4e0a\u7a0b\u5e8f\u6267\u884c\u7ed3\u679c\u4e3a\uff1a<\/p>\n<pre>\nHello, Swift!\n\u4f60\u597d\u4e16\u754c\n<\/pre>\n<hr>\n<h2>\u5e38\u91cf\u8f93\u51fa<\/h2>\n<p>\u53d8\u91cf\u548c\u5e38\u91cf\u53ef\u4ee5\u4f7f\u7528 print\uff08swift 2 \u5c06 print \u66ff\u6362\u4e86 println\uff09 \u51fd\u6570\u6765\u8f93\u51fa\u3002<\/p>\n<p>\n\u5728\u5b57\u7b26\u4e32\u4e2d\u53ef\u4ee5\u4f7f\u7528\u62ec\u53f7\u4e0e\u53cd\u659c\u7ebf\u6765\u63d2\u5165\u5e38\u91cf\uff0c\u5982\u4e0b\u5b9e\u4f8b\uff1a<\/p>\n<pre>\nimport Cocoa\n\nlet name = \"\u83dc\u9e1f\u6559\u7a0b\"\nlet site = \"http:\/\/www.runoob.com\"\n\nprint(\"\\(name)\u7684\u5b98\u7f51\u5730\u5740\u4e3a\uff1a\\(site)\")\n<\/pre>\n<p>\u4ee5\u4e0a\u7a0b\u5e8f\u6267\u884c\u7ed3\u679c\u4e3a\uff1a<\/p>\n<pre>\u83dc\u9e1f\u6559\u7a0b\u7684\u5b98\u7f51\u5730\u5740\u4e3a\uff1ahttp:\/\/www.runoob.com<\/pre>\n<\/p><\/div>\n<\/p><\/div>\n<span>","protected":false},"excerpt":{"rendered":"<p class=\"excerpt\"><span itemprop=\"description\">Swift \u5e38\u91cf \u5e38\u91cf\u4e00\u65e6\u8bbe\u5b9a\uff0c\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6\u5c31\u65e0\u6cd5\u6539\u53d8\u5176\u503c\u3002 \u5e38\u91cf\u53ef\u4ee5\u662f\u4efb\u4f55\u7684\u6570\u636e\u7c7b\u578b\u5982\uff1a&hellip;<\/span><\/p>\n<p class=\"more-link-p btn-align-right\"><a class=\"green zoom-btn\" href=\"https:\/\/www.puzi7.net\/?p=512\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26,28],"tags":[74,119],"class_list":["post-512","post","type-post","status-publish","format-standard","hentry","category-mobile","category-swift","tag-ios","tag-swift","zoom-theme-has-thumb"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Swift \u5e38\u91cf - \u8c31\u5b50\u68cb - Puzi7<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.puzi7.net\/?p=512\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Swift \u5e38\u91cf - \u8c31\u5b50\u68cb - Puzi7\" \/>\n<meta property=\"og:description\" content=\"Swift \u5e38\u91cf \u5e38\u91cf\u4e00\u65e6\u8bbe\u5b9a\uff0c\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6\u5c31\u65e0\u6cd5\u6539\u53d8\u5176\u503c\u3002 \u5e38\u91cf\u53ef\u4ee5\u662f\u4efb\u4f55\u7684\u6570\u636e\u7c7b\u578b\u5982\uff1a&hellip;Read More\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.puzi7.net\/?p=512\" \/>\n<meta property=\"og:site_name\" content=\"\u8c31\u5b50\u68cb - Puzi7\" \/>\n<meta property=\"article:published_time\" content=\"2018-02-23T15:38:54+00:00\" \/>\n<meta name=\"author\" content=\"\u77f3\u8863\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u77f3\u8863\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.puzi7.net\\\/?p=512#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.puzi7.net\\\/?p=512\"},\"author\":{\"name\":\"\u77f3\u8863\",\"@id\":\"https:\\\/\\\/www.puzi7.net\\\/#\\\/schema\\\/person\\\/87dd4941c8ec260c1350b7f41980a190\"},\"headline\":\"Swift \u5e38\u91cf\",\"datePublished\":\"2018-02-23T15:38:54+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.puzi7.net\\\/?p=512\"},\"wordCount\":13,\"commentCount\":0,\"keywords\":[\"iOS\",\"Swift\"],\"articleSection\":[\"Mobile\",\"Swift\"],\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.puzi7.net\\\/?p=512#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.puzi7.net\\\/?p=512\",\"url\":\"https:\\\/\\\/www.puzi7.net\\\/?p=512\",\"name\":\"Swift \u5e38\u91cf - \u8c31\u5b50\u68cb - Puzi7\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.puzi7.net\\\/#website\"},\"datePublished\":\"2018-02-23T15:38:54+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/www.puzi7.net\\\/#\\\/schema\\\/person\\\/87dd4941c8ec260c1350b7f41980a190\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.puzi7.net\\\/?p=512#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.puzi7.net\\\/?p=512\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.puzi7.net\\\/?p=512#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\\\/\\\/www.puzi7.net\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"\u6280\u672f\",\"item\":\"https:\\\/\\\/www.puzi7.net\\\/?cat=9\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Mobile\",\"item\":\"https:\\\/\\\/www.puzi7.net\\\/?cat=26\"},{\"@type\":\"ListItem\",\"position\":4,\"name\":\"Swift\",\"item\":\"https:\\\/\\\/www.puzi7.net\\\/?cat=28\"},{\"@type\":\"ListItem\",\"position\":5,\"name\":\"Swift \u5e38\u91cf\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.puzi7.net\\\/#website\",\"url\":\"https:\\\/\\\/www.puzi7.net\\\/\",\"name\":\"\u8c31\u5b50\u68cb - Puzi7\",\"description\":\"\u5206\u4eab\uff0c\u6210\u957f\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.puzi7.net\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.puzi7.net\\\/#\\\/schema\\\/person\\\/87dd4941c8ec260c1350b7f41980a190\",\"name\":\"\u77f3\u8863\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/c52c3a64b447af78e58cfa1c73ddd53952049afcf934cd702d71eee91f9907bd?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/c52c3a64b447af78e58cfa1c73ddd53952049afcf934cd702d71eee91f9907bd?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/c52c3a64b447af78e58cfa1c73ddd53952049afcf934cd702d71eee91f9907bd?s=96&d=mm&r=g\",\"caption\":\"\u77f3\u8863\"},\"sameAs\":[\"https:\\\/\\\/www.puzi7.net\"],\"url\":\"https:\\\/\\\/www.puzi7.net\\\/?author=1\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Swift \u5e38\u91cf - \u8c31\u5b50\u68cb - Puzi7","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.puzi7.net\/?p=512","og_locale":"zh_CN","og_type":"article","og_title":"Swift \u5e38\u91cf - \u8c31\u5b50\u68cb - Puzi7","og_description":"Swift \u5e38\u91cf \u5e38\u91cf\u4e00\u65e6\u8bbe\u5b9a\uff0c\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6\u5c31\u65e0\u6cd5\u6539\u53d8\u5176\u503c\u3002 \u5e38\u91cf\u53ef\u4ee5\u662f\u4efb\u4f55\u7684\u6570\u636e\u7c7b\u578b\u5982\uff1a&hellip;Read More","og_url":"https:\/\/www.puzi7.net\/?p=512","og_site_name":"\u8c31\u5b50\u68cb - Puzi7","article_published_time":"2018-02-23T15:38:54+00:00","author":"\u77f3\u8863","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"\u77f3\u8863"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.puzi7.net\/?p=512#article","isPartOf":{"@id":"https:\/\/www.puzi7.net\/?p=512"},"author":{"name":"\u77f3\u8863","@id":"https:\/\/www.puzi7.net\/#\/schema\/person\/87dd4941c8ec260c1350b7f41980a190"},"headline":"Swift \u5e38\u91cf","datePublished":"2018-02-23T15:38:54+00:00","mainEntityOfPage":{"@id":"https:\/\/www.puzi7.net\/?p=512"},"wordCount":13,"commentCount":0,"keywords":["iOS","Swift"],"articleSection":["Mobile","Swift"],"inLanguage":"zh-Hans","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.puzi7.net\/?p=512#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.puzi7.net\/?p=512","url":"https:\/\/www.puzi7.net\/?p=512","name":"Swift \u5e38\u91cf - \u8c31\u5b50\u68cb - Puzi7","isPartOf":{"@id":"https:\/\/www.puzi7.net\/#website"},"datePublished":"2018-02-23T15:38:54+00:00","author":{"@id":"https:\/\/www.puzi7.net\/#\/schema\/person\/87dd4941c8ec260c1350b7f41980a190"},"breadcrumb":{"@id":"https:\/\/www.puzi7.net\/?p=512#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.puzi7.net\/?p=512"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.puzi7.net\/?p=512#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.puzi7.net\/"},{"@type":"ListItem","position":2,"name":"\u6280\u672f","item":"https:\/\/www.puzi7.net\/?cat=9"},{"@type":"ListItem","position":3,"name":"Mobile","item":"https:\/\/www.puzi7.net\/?cat=26"},{"@type":"ListItem","position":4,"name":"Swift","item":"https:\/\/www.puzi7.net\/?cat=28"},{"@type":"ListItem","position":5,"name":"Swift \u5e38\u91cf"}]},{"@type":"WebSite","@id":"https:\/\/www.puzi7.net\/#website","url":"https:\/\/www.puzi7.net\/","name":"\u8c31\u5b50\u68cb - Puzi7","description":"\u5206\u4eab\uff0c\u6210\u957f","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.puzi7.net\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"zh-Hans"},{"@type":"Person","@id":"https:\/\/www.puzi7.net\/#\/schema\/person\/87dd4941c8ec260c1350b7f41980a190","name":"\u77f3\u8863","image":{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/secure.gravatar.com\/avatar\/c52c3a64b447af78e58cfa1c73ddd53952049afcf934cd702d71eee91f9907bd?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/c52c3a64b447af78e58cfa1c73ddd53952049afcf934cd702d71eee91f9907bd?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/c52c3a64b447af78e58cfa1c73ddd53952049afcf934cd702d71eee91f9907bd?s=96&d=mm&r=g","caption":"\u77f3\u8863"},"sameAs":["https:\/\/www.puzi7.net"],"url":"https:\/\/www.puzi7.net\/?author=1"}]}},"_links":{"self":[{"href":"https:\/\/www.puzi7.net\/index.php?rest_route=\/wp\/v2\/posts\/512","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.puzi7.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.puzi7.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.puzi7.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.puzi7.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=512"}],"version-history":[{"count":0,"href":"https:\/\/www.puzi7.net\/index.php?rest_route=\/wp\/v2\/posts\/512\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.puzi7.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=512"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.puzi7.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=512"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.puzi7.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=512"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}