如何投射AnyObject？在Swift 1.2中使用String [英] How to cast AnyObject? to String in Swift 1.2

问题描述

一切都很好，直到我下载了新版本的Xcode 6.3和Swift 1.2。

Everything good until, I've downloaded the new version of Xcode 6.3 and Swift 1.2.

但是当我再次编译我的应用程序时，出现了很多错误。我已经处理了大部分问题，但是有一个特定的错误，我无法弄清楚解决方案

But when I compile my app again, a lots of error came out. I've dealt with most of them but there is a specific error that I couldn't figure it out the solutions

错误是AnyObject？无法转换为String ？

The error is "AnyObject? is not convertible to String?"

在更新Xcode之前，这绝对没问题：

Before updating Xcode this was absolutely fine :

let firstName = self.currentUser["firstName"] as? String

推荐答案

我已经找到了解决方案

let firstName = self.currentUser?["firstName"] as? String
if let firstname = firstName {
     // Continue
} else {
    // Handling the error.
}

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