https://www.young40.com/categories/swift/ Recent content in Swift on 杨世玲的博客 Hugo en-us 杨世玲 Sat, 30 Jun 2018 11:25:49 +0800 https://www.young40.com/post/2018-06-30-learn-swift-01-guard/ Sat, 30 Jun 2018 11:25:49 +0800 https://www.young40.com/post/2018-06-30-learn-swift-01-guard/ <p> <code class="verbatim">guard</code> 是Swift 2.0引入的新关键字, 用于当条件不满足时, 不再执行后续的代码. 当然, 官方文档上说是交出当前作用域的程序控制权.</p>