Swift 动态转换失败 - AnyObject？!到字符串

Question

我刚刚更新到 Xcode 6 beta 6，之前我的代码有以下问题

let reminderSubject = reminder["subject"]
println("reminderSubject: \(reminderSubject)")
let tempTuple = (reminderSubject as String)

reminderSubject 是 AnyObject 类型？!当我尝试将其向下转换为 String 时，它崩溃并显示“Swift dynamic cast failure”消息。 println 打印的值是:Optional(Hey its Test!)

所以问题是如何正确转换 AnyObject？!到 Swift 中的字符串？

Answer 1

好的，我已经完成了:

let tempTuple = ("\(reminderSubject!!)")