{"id":2003,"date":"2024-05-02T10:18:02","date_gmt":"2024-05-02T02:18:02","guid":{"rendered":"https:\/\/wp.minicoda.com\/?p=2003"},"modified":"2024-05-02T10:19:00","modified_gmt":"2024-05-02T02:19:00","slug":"%e5%a6%82%e4%bd%95%e7%90%86%e8%a7%a3swift%e7%9a%84if-let%e8%af%ad%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/wp.minicoda.com\/index.php\/%e5%a6%82%e4%bd%95%e7%90%86%e8%a7%a3swift%e7%9a%84if-let%e8%af%ad%e5%8f%a5\/","title":{"rendered":"\u5982\u4f55\u7406\u89e3Swift\u7684if let\u8bed\u53e5?"},"content":{"rendered":"\n

Swift\u5141\u8bb8if\u6761\u4ef6\u91cc\u9762\u7528let\u8bed\u53e5\uff1a<\/p>\n\n\n\n

var a: Int? = 100<\/p>\n\n\n\n

if let c = a, c > 50<\/em><\/strong> {<\/p>\n\n\n\n

    print(\"a > 50\")<\/p>\n\n\n\n

} else {<\/p>\n\n\n\n

    print(\"a <= 50\")<\/p>\n\n\n\n

}<\/p>\n\n\n\n

\u5e76\u4e0d\u662f\u5982\u4e0a\u7684if\u6761\u4ef6\u4e0d\u7b26\u5408Swift\u8bed\u6cd5\uff0c\u53cd\u800c\uff0cSwift\u4e3a\u4e86\u652f\u6301\u8fd9\u79cd\u4fbf\u6377\u7684\u6761\u4ef6\uff0c\u8868\u8fbe\u5f0f\u8bed\u6cd5\u52a0\u5165\u4e86let\u6216var\u521d\u59cb\u5316\u3002<\/p>\n\n\n\n

condition-list<\/em> \u2192 condition<\/em> | condition<\/em> ,<\/code><\/strong> condition-list<\/em>
condition<\/em> \u2192 expression<\/em> | availability-condition<\/em> | case-condition<\/em> | optional-binding-condition<\/em><\/p>\n\n\n\n

case-condition<\/em>\u00a0\u2192\u00a0case\u00a0pattern<\/em>\u00a0initializer<\/em>
optional-binding-condition<\/em>\u00a0\u2192\u00a0let<\/code><\/strong>\u00a0pattern<\/em>\u00a0initializer?<\/em>\u00a0|\u00a0var<\/code><\/strong>\u00a0pattern<\/em>\u00a0initializer?<\/em><\/p>\n\n\n\n

Refer: If Statements | swift.org<\/a> While Statements | swift.org<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Swift\u5141\u8bb8if\u6761\u4ef6\u91cc\u9762\u7528let\u8bed\u53e5\uff1a var a: Int? = 100 if let c = a, c > 50 {     print(\"a > 50\") } ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[299],"tags":[],"class_list":["post-2003","post","type-post","status-publish","format-standard","hentry","category-think"],"views":319,"_links":{"self":[{"href":"https:\/\/wp.minicoda.com\/index.php\/wp-json\/wp\/v2\/posts\/2003","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.minicoda.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wp.minicoda.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wp.minicoda.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.minicoda.com\/index.php\/wp-json\/wp\/v2\/comments?post=2003"}],"version-history":[{"count":2,"href":"https:\/\/wp.minicoda.com\/index.php\/wp-json\/wp\/v2\/posts\/2003\/revisions"}],"predecessor-version":[{"id":2005,"href":"https:\/\/wp.minicoda.com\/index.php\/wp-json\/wp\/v2\/posts\/2003\/revisions\/2005"}],"wp:attachment":[{"href":"https:\/\/wp.minicoda.com\/index.php\/wp-json\/wp\/v2\/media?parent=2003"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wp.minicoda.com\/index.php\/wp-json\/wp\/v2\/categories?post=2003"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wp.minicoda.com\/index.php\/wp-json\/wp\/v2\/tags?post=2003"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}