类型'任何'没有下标成员

Question

当我转换为swift 3时，它的说法类型没有下标的成员。

let dataDictionary = try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.mutableContainers)
let accessToken = dataDictionary["access_token"] as! AnyObject?

我尝试了许多可能性，但没有奏效。

Answer 1

JSONSerialization.jsonObject(with:options:)的返回类型为Any，不允许下标。您必须使用显式类型转换为下标。如果您尝试将数据转换为[String: Any]，则可以执行以下操作：

if let dataDictionary = dataDictionary as? [String: Any] {
    // dataDictionary["access_token"] as AnyObject
}

Answer 2

JSONSerialization.jsonObject会抛出错误，所以请在do catch块

中捕获它

    do {
        let dataDictionary = try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.mutableContainers) as! [String: Any]
        let accessToken = dataDictionary["access_token"] as! AnyObject
    } catch let error as NSError {
        print(error)
    }