{"id":42409,"date":"2023-12-11T14:56:29","date_gmt":"2023-12-11T06:56:29","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=42409"},"modified":"2023-12-11T14:56:29","modified_gmt":"2023-12-11T06:56:29","slug":"ios-%e7%b1%bb%ef%bc%88class%ef%bc%89%e5%92%8c%e7%bb%93%e6%9e%84%e4%bd%93%ef%bc%88struct%ef%bc%89%e6%9c%89%e4%bb%80%e4%b9%88%e5%8c%ba%e5%88%ab%ef%bc%9f","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/11\/ios-%e7%b1%bb%ef%bc%88class%ef%bc%89%e5%92%8c%e7%bb%93%e6%9e%84%e4%bd%93%ef%bc%88struct%ef%bc%89%e6%9c%89%e4%bb%80%e4%b9%88%e5%8c%ba%e5%88%ab%ef%bc%9f\/","title":{"rendered":"iOS \u7c7b\uff08class\uff09\u548c\u7ed3\u6784\u4f53\uff08struct\uff09\u6709\u4ec0\u4e48\u533a\u522b\uff1f"},"content":{"rendered":"

“`” Swift \u4e2d\uff0c\u7c7b\u662f\u5f15\u7528\u7c7b\u578b\uff0c\u7ed3\u6784\u4f53\u662f\u503c\u7c7b\u578b\u3002\u503c\u7c7b\u578b\u5728\u4f20\u9012\u548c\u8d4b\u503c\u65f6\u5c06\u8fdb\u884c\u590d\u5236\uff0c\u800c\u5f15\u7528\u7c7b\u578b\u5219\u53ea\u4f1a\u4f7f\u7528\u5f15\u7528\u5bf9\u8c61\u7684\u4e00\u4e2a””\u6307\u5411””\u3002\u6240\u4ee5\u4ed6\u4eec\u4e24\u8005\u4e4b\u95f4\u7684\u533a\u522b\u5c31\u662f\u4e24\u4e2a\u7c7b\u578b\u7684\u533a\u522b\u3002<\/p>\n

\u4e3e\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff0c\u4ee3\u7801\u5982\u4e0b<\/p>\n

\u00a0<\/p>\n

<pre><code class=""language-swift"" lang=""swift"">class Temperature {
\n var value: Float = 37.0
\n}<\/p>\n

class Person {
\n var temp: Temperature?<\/p>\n

func sick() {
\n temp?.value = 41.0
\n }
\n}<\/p>\n

let A = Person()
\nlet B = Person()
\nlet temp = Temperature()<\/p>\n

A.temp = temp
\nB.temp = temp
\n<\/code><\/pre><\/p>\n

A.sick()
\n \u4e0a\u9762\u8fd9\u6bb5\u4ee3\u7801\uff0c\u7531\u4e8e Temperature \u662f class \uff0c\u4e3a\u5f15\u7528\u7c7b\u578b\uff0c\u6545 A \u7684 temp \u548c B \u7684 temp\u6307\u5411\u540c\u4e00\u4e2a\u5bf9\u8c61\u3002A \u7684 temp\u4fee\u6539\u4e86\uff0cB \u7684 temp \u4e5f\u968f\u4e4b\u4fee\u6539\u3002\u8fd9\u6837 A \u548c B \u7684 temp \u7684\u503c\u90fd\u88ab\u6539\u6210\u4e8641.0\u3002\u5982\u679c\u5c06 Temperature \u6539\u4e3a struct\uff0c\u4e3a\u503c\u7c7b\u578b\uff0c\u5219 A \u7684 temp \u4fee\u6539\u4e0d\u5f71\u54cd B \u7684 temp\u3002<\/p>\n

\u5185\u5b58\u4e2d\uff0c\u5f15\u7528\u7c7b\u578b\u8bf8\u5982\u7c7b\u662f\u5728\u5806\uff08heap\uff09\u4e0a\uff0c\u800c\u503c\u7c7b\u578b\u8bf8\u5982\u7ed3\u6784\u4f53\u5b9e\u5728\u6808\uff08stack\uff09\u4e0a\u8fdb\u884c\u5b58\u50a8\u548c\u64cd\u4f5c\u3002\u76f8\u6bd4\u4e8e\u6808\u4e0a\u7684\u64cd\u4f5c\uff0c\u5806\u4e0a\u7684\u64cd\u4f5c\u66f4\u52a0\u590d\u6742\u8017\u65f6\uff0c\u6240\u4ee5\u82f9\u679c\u5b98\u65b9\u63a8\u8350\u4f7f\u7528\u7ed3\u6784\u4f53\uff0c\u8fd9\u6837\u53ef\u4ee5\u63d0\u9ad8 App \u8fd0\u884c\u7684\u6548\u7387\u3002<\/p>\n

class\u6709\u8fd9\u51e0\u4e2a\u529f\u80fdstruct\u6ca1\u6709\u7684\uff1a<\/p>\n

class\u53ef\u4ee5\u7ee7\u627f\uff0c\u8fd9\u6837\u5b50\u7c7b\u53ef\u4ee5\u4f7f\u7528\u7236\u7c7b\u7684\u7279\u6027\u548c\u65b9\u6cd5
\n \u7c7b\u578b\u8f6c\u6362\u53ef\u4ee5\u5728runtime\u7684\u65f6\u5019\u68c0\u67e5\u548c\u89e3\u91ca\u4e00\u4e2a\u5b9e\u4f8b\u7684\u7c7b\u578b
\n \u53ef\u4ee5\u7528deinit\u6765\u91ca\u653e\u8d44\u6e90
\n \u4e00\u4e2a\u7c7b\u53ef\u4ee5\u88ab\u591a\u6b21\u5f15\u7528
\n struct\u4e5f\u6709\u8fd9\u6837\u51e0\u4e2a\u4f18\u52bf\uff1a<\/p>\n

\u7ed3\u6784\u8f83\u5c0f\uff0c\u9002\u7528\u4e8e\u590d\u5236\u64cd\u4f5c\uff0c\u76f8\u6bd4\u4e8e\u4e00\u4e2aclass\u7684\u5b9e\u4f8b\u88ab\u591a\u6b21\u5f15\u7528\u66f4\u52a0\u5b89\u5168\u3002
\n \u65e0\u987b\u62c5\u5fc3\u5185\u5b58memory leak\u6216\u8005\u591a\u7ebf\u7a0b\u51b2\u7a81\u95ee\u9898<\/p>\n

\u00a0<\/p>\n

<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"

“`” Swift \u4e2d\uff0c\u7c7b\u662f\u5f15\u7528\u7c7b\u578b\uff0c\u7ed3\u6784\u4f53\u662f\u503c\u7c7b\u578b\u3002\u503c\u7c7b\u578b\u5728\u4f20\u9012\u548c\u8d4b\u503c\u65f6\u5c06\u8fdb\u884c\u590d\u5236\uff0c […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-42409","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/42409","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=42409"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/42409\/revisions"}],"predecessor-version":[{"id":42410,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/42409\/revisions\/42410"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=42409"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=42409"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=42409"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}