swift – ‘(String,AnyObject)’不能转换为'[String：AnyObject]’

概述// response is of type AnyObject!let responseDic = response as [String : AnyObject]let userDic = responseDic["user"] as [String : AnyObject] 但是,在最后一行,我得到错误： '(String, AnyObject)' is not convertible

// response is of type AnyObject!let responseDic = response as [String : AnyObject]let userDic = responseDic["user"] as [String : AnyObject]

但是,在最后一行,我得到错误：

'(String,AnyObject)' is not convertible to '[String : AnyObject]'

所以我猜想在字典中查找一个键可以返回一个可选的值,所以我试过：

let userDic = responseDic["user"]? as [String : AnyObject]

但我得到：

'String' is not convertible to 'DictionaryIndex<String,AnyObject>'

什么是正确的方式让这个工作？

使用感叹号来解开可选项：

var response: AnyObject! = ["user" : [String : AnyObject]()]let responseDic = response as [String : AnyObject]let userDic: [String : AnyObject] = responseDic["user"]! as [String : AnyObject]

如果你想确定key’user’是一个非零值,它是一个[String：AnyObject],你可以使用一个if：

if let user: AnyObject = responseDic["user"] {    if let userDic = user as? [String : AnyObject]{        //do stuff with userDic    }}

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