{"id":47,"date":"2021-09-14T15:17:36","date_gmt":"2021-09-14T07:17:36","guid":{"rendered":"https:\/\/yomisoft.com\/?p=47"},"modified":"2023-09-01T10:04:33","modified_gmt":"2023-09-01T02:04:33","slug":"swift5-0%e7%b2%be%e7%ae%80%e7%ac%94%e8%ae%b0-%e7%ac%ac4%e7%ab%a0-%e5%9f%ba%e7%a1%80%e8%bf%90%e7%ae%97%e7%ac%a6","status":"publish","type":"post","link":"https:\/\/www.yomisoft.com\/index.php\/2021\/09\/14\/swift5-0%e7%b2%be%e7%ae%80%e7%ac%94%e8%ae%b0-%e7%ac%ac4%e7%ab%a0-%e5%9f%ba%e7%a1%80%e8%bf%90%e7%ae%97%e7%ac%a6\/","title":{"rendered":"Swift5.0\u7cbe\u7b80\u7b14\u8bb0-\u7b2c4\u7ae0-\u57fa\u7840\u8fd0\u7b97\u7b26"},"content":{"rendered":"<p>Swift\u4e2d\u7684\u57fa\u7840\u8fd0\u7b97\u7b26\u5408\u903b\u8f91\u8fd0\u7b97\u7b26\uff0c\u8ddf\u5176\u4ed6\u7f16\u7a0b\u8bed\u8a00\u51e0\u4e4e\u5b8c\u5168\u4e00\u6837\uff0c\u8be5\u6709\u7684Swift\u90fd\u6709\uff0c\u7528\u6cd5\u4e5f\u5b8c\u5168\u4e00\u6837\uff0c\u7531\u4e8e\u8bfb\u6b64\u4e13\u680f\u7684\u5c0f\u4f19\u4f34\uff0c\u6211\u9ed8\u8ba4\u4f60\u4eec\u662f\u5b66\u8fc7\u7f16\u7a0b\u7684\uff0c\u6240\u4ee5\u6211\u5c31\u4e0d\u5728\u591a\u89e3\u91caSwift\u4e2d\u7684\u8fd0\u7b97\u7b26\u4e86\uff0c\u53ea\u7b80\u5355\u4ecb\u7ecd\u4e00\u4e0b :huaji9:<br \/>\n<strong>\u57fa\u7840\u8fd0\u7b97\u7b26<\/strong><br \/>\n\u52a0\u6cd5\uff1a<code class=\"\">+<\/code><br \/>\n\u51cf\u6cd5\uff1a<code class=\"\">-<\/code><br \/>\n\u4e58\u6cd5\uff1a<code class=\"\">*<\/code><br \/>\n\u9664\u6cd5\uff1a<code class=\"\">\/<\/code><br \/>\n\u6c42\u4f59\uff1a<code class=\"\">%<\/code><br \/>\n\u8d4b\u503c\uff1a<code class=\"\">=<\/code><br \/>\n<strong>\u6bd4\u8f83\u8fd0\u7b97\u7b26<\/strong><br \/>\n\u7b49\u4e8e\uff1a<code class=\"\">==<\/code><br \/>\n\u4e0d\u7b49\uff1a<code class=\"\">!=<\/code><br \/>\n\u5927\u4e8e\uff1a<code class=\"\">&gt;<\/code><br \/>\n\u5c0f\u4e8e\uff1a<code class=\"\">&lt;<\/code><br \/>\n\u5927\u4e8e\u7b49\u4e8e\uff1a<code class=\"\">&gt;=<\/code><br \/>\n\u5c0f\u4e8e\u7b49\u4e8e\uff1a<code class=\"\">&lt;=<\/code><br \/>\n<strong>\u903b\u8f91\u8fd0\u7b97\u7b26<\/strong><br \/>\n\u903b\u8f91\u4e0e\uff1a<code class=\"\">&amp;&amp;<\/code><br \/>\n\u903b\u8f91\u6216\uff1a<code class=\"\">||<\/code><br \/>\n\u903b\u8f91\u975e\uff1a<code class=\"\">!<\/code><br \/>\n<strong>\u4e09\u5143\u8fd0\u7b97\u7b26<\/strong><br \/>\n<code class=\"\">a?b:c<\/code><br \/>\n\u7528\u6cd5\u8ddf\u5176\u4ed6\u7f16\u7a0b\u8bed\u8a00\u7684\u7528\u6cd5\u4e00\u6837\uff0ca\u4e3a\u771f\u53d6b\u7684\u503c\uff0c\u4e3a\u5047\u53d6c\u7684\u503c<br \/>\n<strong>\u5408\u5e76\u7a7a\u503c\u8fd0\u7b97\u7b26<\/strong><br \/>\n<code class=\"\">??<\/code><br \/>\n\u5173\u4e8e\u5408\u5e76\u7a7a\u503c\u8fd0\u7b97\u7b26\uff0c\u524d\u9762\u7684\u7ae0\u8282\u7b80\u5355\u7528\u8fc7\uff0c\u6587\u7ae0\u4f1a\u5177\u4f53\u518d\u89e3\u91ca<br \/>\n<strong>\u533a\u95f4\u8fd0\u7b97\u7b26<\/strong><br \/>\nSwift\u8fd8\u63d0\u4f9b\u533a\u95f4\u8fd0\u7b97\u7b26\uff0c\u540e\u9762\u7684\u6587\u7ae0\u4f1a\u8be6\u7ec6\u4ecb\u7ecd\uff0c\u8fd9\u91cc\u5c31\u4e0d\u89e3\u91ca\u4e86<br \/>\n<strong>\u5173\u4e8e\u8fd0\u7b97\u7b26\u8fd8\u6709\u4e00\u4e9b\u7ec6\u8282\u4e0a\u7684\u64cd\u4f5c\u9700\u8981\u7b80\u5355\u8bf4\u660e\u4e00\u4e0b\uff0c\u5982\u4e0b\u6240\u8ff0<\/strong><br \/>\n1\uff1a\u51cf\u53f7\u653e\u5230\u6570\u5b57\u524d\u9762\u8868\u793a\u8d1f\u6570\uff1a<code class=\"\">-8\u3001-9\u3001-45<\/code><br \/>\n2\uff1a\u611f\u53f9\u53f7\u653e\u5230Bool\u503c\u524d\u9762\u8868\u793a\u53d6\u53cd\uff1a<br \/>\n<code class=\"\">!true<\/code>\u8868\u793afalse\uff0c<code class=\"\">!false<\/code>\u8868\u793atrue<br \/>\n3\uff1a\u611f\u53f9\u53f7\u653e\u5230\u53ef\u9009\u7c7b\u578b\u540e\u9762\u8868\u793a\u89e3\u6790\u91cc\u9762\u7684\u503c\uff0c\u8fd9\u4e2a\u524d\u9762\u53ef\u9009\u7c7b\u578b\u7684\u7ae0\u8282\u91cc\u5df2\u7ecf\u4ecb\u7ecd\u4e86\uff1a<\/p>\n<pre class=\"hl\"><code class=\"\">var a:Int? = 10\nprInt(a!)<\/code><\/pre>\n<p>4\uff1a\u4e00\u4e9b\u7b80\u5199\u65b9\u5f0f\u6bd4\u5982\uff1aa = a+b\uff0c\u53ef\u4ee5\u5199\u6210a+=b\uff0c\u5176\u4ed6\u65b9\u5f0f\u540c\u7406\uff0c-=\uff0c*=\uff0c\/= \u8ddf\u5176\u4ed6\u7f16\u7a0b\u8bed\u8a00\u90fd\u4e00\u6837<br \/>\n5\uff1a\u9700\u8981\u7279\u522b\u6ce8\u610f\u7684\u662f\uff0c\u6700\u65b0\u7684Swift\u5df2\u7ecf\u53bb\u6389\u4e86\uff0c\u7c7b\u4f3c i++\u3001i-- \u8fd9\u79cd\u8fd0\u7b97\uff0c\u6709\u4e9b\u5c0f\u4f19\u4f34\u53ef\u80fd\u4f1a\u95ee\u4e86\uff0c\u6ca1\u4e86i++\uff0c\u5199for\u5faa\u73af\u5c82\u4e0d\u662f\u6ca1\u6709\u4e86\u7075\u9b42\uff0c\u4e0d\u8fc7\u4e0d\u7528\u62c5\u5fc3\uff0cSwift\u63d0\u4f9b\u4e86\u53e6\u5916\u4e00\u79cd\u533a\u95f4\u8fd0\u7b97\u7b26\uff0c\u53ef\u4ee5\u5f88\u597d\u7684\u89e3\u51b3\u6b64\u7c7b\u95ee\u9898\uff0c\u800c\u4e14\u533a\u95f4\u8fd0\u7b97\u7b26\uff0c\u611f\u89c9\u66f4\u52a0\u9b54\u6027\uff0c\u8d70\u4f4d\u66f4\u52a0\u98ce\u9a9a\uff0c\u7528\u6cd5\u66f4\u52a0\u5201\u94bb\uff0c\u540e\u9762\u7684\u7ae0\u8282\u4f1a\u5355\u72ec\u4ecb\u7ecd :huaji4:<br \/>\n6\uff1aSwift\u8fd8\u63d0\u4f9b\u4e86 === \u548c !== \u8fd0\u7b97\u7b26\uff0c\u7528\u6765\u5224\u65ad\u4e24\u4e2a\u5f15\u7528\u662f\u5426\u76f8\u7b49\uff0c\u540e\u9762\u5173\u4e8e\u7c7b\u548c\u5bf9\u8c61\u7684\u65f6\u5019\uff0c\u518d\u5177\u4f53\u89e3\u91ca<br \/>\n<strong>\u8fd0\u7b97\u7b26\u4f18\u5148\u7ea7<\/strong><br \/>\nSwift\u4e2d\u7684\u8fd0\u7b97\u7b26\u4f18\u5148\u7ea7\uff0c\u8ddf\u5176\u4ed6\u7f16\u7a0b\u8bed\u8a00\u4e00\u6837\uff0c\u4f8b\u5982\uff1a\u4e0b\u9762\u8fd0\u7b97\uff0c\u80af\u5b9a\u5148\u7b972*3\u6700\u540e\u518d\u52a01<\/p>\n<pre class=\"hl\"><code class=\"\">var a = 1+2*3\nprInt(a)\n\/*\n*\u7f16\u8bd1\u5668\u6253\u5370\u7ed3\u679c\uff1a\n7\n*\/<\/code><\/pre>\n<p>\u5229\u7528\u62ec\u53f7\u63d0\u9ad8\u4f18\u5148\u7ea7\uff1a\u4e0b\u9762\u5148\u8fd0\u7b97\u62ec\u53f7\u91cc\u9762\u76841+2\uff0c\u6700\u540e\u518d\u4e583<\/p>\n<pre class=\"hl\"><code class=\"\">var b = (1+2)*3\nprint(b)\n\/*\n*\u7f16\u8bd1\u5668\u6253\u5370\u7ed3\u679c\uff1a\n9\n*\/<\/code><\/pre>\n<p><strong>\u5173\u4e8e\u5408\u5e76\u7a7a\u503c\u8fd0\u7b97\u7b26<\/strong><br \/>\n\u8fd9\u4e2a\u9700\u8981\u5355\u72ec\u89e3\u91ca\u4e00\u4e0b\uff0c\u8fd9\u4e2a\u8fd0\u7b97\u7b26\u5728\u8d77\u7801\u8bb2\u53ef\u9009\u7c7b\u578b\u7684\u65f6\u5019\u7b80\u5355\u7528\u8fc7\uff0c\u53ea\u662f\u6ca1\u5177\u4f53\u89e3\u91ca\u3002<br \/>\n\u8bf7\u770b\u4e0b\u9762\u4ee3\u7801\uff0c\u53ef\u9009\u7c7b\u578ba\u4e2d\u6709\u503c\uff0c\u90a3\u4e48\u5c31\u5c0610\u8d4b\u503c\u7ed9c\uff0c\u53ef\u9009\u7c7b\u578bb\u4e2d\u6ca1\u6709\u503c\u4e3anil\uff0c\u90a3\u4e48\u5c31\u5c060\u8d4b\u503c\u7ed9d<\/p>\n<pre class=\"hl\"><code class=\"\">var a:Int? = 10\nvar b:Int? = nil\nvar c = a ?? 100\nvar d = b ?? 0\nprint(c)\nprint(d)\n\/*\n*\u7f16\u8bd1\u5668\u6253\u5370\u7ed3\u679c\uff1a\n10\n0\n*\/<\/code><\/pre>\n<p>\u5982\u679c\u4e0d\u6015\u9ebb\u70e6\u4e5f\u53ef\u4ee5\u7528\u4e09\u5143\u8fd0\u7b97\u7b26\u6765\u5199<\/p>\n<pre class=\"hl\"><code class=\"\">var value:Int? = 10<\/code><\/pre>\n<p>value != nil\u662f\u4e2a\u5224\u65ad\u8bed\u53e5\uff0c\u7ed3\u679c\u662fBool\u503c<br \/>\n\u5982\u679cvalue\u4e0d\u7b49\u4e8enil\uff0c\u90a3\u4e48\u5c31\u5c06value!\u4e2d\u7684\u503c\u89e3\u6790\u51fa\u6765\u8d4b\u503c\u7ed9a\uff0c\u5982\u679c\u7b49\u4e8enil\u90a3\u5c31\u5c060\u8d4b\u7ed9a<\/p>\n<pre class=\"hl\"><code class=\"\">var a = value != nil ? value! : 0\nprint(a)\n\/*\n*\u7f16\u8bd1\u5668\u6253\u5370\u7ed3\u679c\uff1a\n10\n*\/<\/code><\/pre>\n<p>\u5982\u679c\u4e0d\u6015\u9ebb\u70e6\uff0c\u53c8\u95f2\u7684\u86cb\u75bc\uff0c\u8fd8\u53ef\u4ee5\u7528if\u8bed\u53e5\u6765\u5199<\/p>\n<pre class=\"hl\"><code class=\"\">var a:Int? = 10\nvar b = -1\nif (a == nil) {\nb = 0\n}else{\nb = a!\n}\nprint(b)\n\/*\n*\u7f16\u8bd1\u5668\u6253\u5370\u7ed3\u679c\uff1a\n10\n*\/<\/code><\/pre>\n<p>\u603b\u7ed3\uff0cSwift\u4e2d\u7684\u5927\u90e8\u5206\u8fd0\u7b97\u7b26\u90fd\u8ddf\u5176\u4ed6\u7f16\u7a0b\u8bed\u8a00\u7684\u4f7f\u7528\u65b9\u5f0f\u4e00\u6837\uff0c\u6240\u4ee5\u6709\u4e9b\u5f88\u57fa\u7840\u7684\u6211\u5c31\u4e0d\u89e3\u91ca\u4e86<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Swift\u4e2d\u7684\u57fa\u7840\u8fd0\u7b97\u7b26\u5408\u903b\u8f91\u8fd0\u7b97\u7b26\uff0c\u8ddf\u5176\u4ed6\u7f16\u7a0b\u8bed\u8a00\u51e0\u4e4e\u5b8c\u5168\u4e00\u6837\uff0c\u8be5\u6709\u7684Swift\u90fd\u6709\uff0c\u7528\u6cd5\u4e5f\u5b8c\u5168\u4e00\u6837\uff0c\u7531\u4e8e\u8bfb\u6b64\u4e13\u680f\u7684\u5c0f\u4f19\u4f34\uff0c\u6211\u9ed8 &#8230;<\/p>\n","protected":false},"author":1,"featured_media":70,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[3],"tags":[8,10,12],"class_list":["post-47","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-3","tag-swift","tag-10","tag-12"],"_links":{"self":[{"href":"https:\/\/www.yomisoft.com\/index.php\/wp-json\/wp\/v2\/posts\/47","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yomisoft.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yomisoft.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yomisoft.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yomisoft.com\/index.php\/wp-json\/wp\/v2\/comments?post=47"}],"version-history":[{"count":1,"href":"https:\/\/www.yomisoft.com\/index.php\/wp-json\/wp\/v2\/posts\/47\/revisions"}],"predecessor-version":[{"id":75,"href":"https:\/\/www.yomisoft.com\/index.php\/wp-json\/wp\/v2\/posts\/47\/revisions\/75"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.yomisoft.com\/index.php\/wp-json\/wp\/v2\/media\/70"}],"wp:attachment":[{"href":"https:\/\/www.yomisoft.com\/index.php\/wp-json\/wp\/v2\/media?parent=47"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yomisoft.com\/index.php\/wp-json\/wp\/v2\/categories?post=47"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yomisoft.com\/index.php\/wp-json\/wp\/v2\/tags?post=47"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}