ios - FBSDKGraphRequest : result - Value of optional type 'Any?' not unwrapped; did you mean to use '!' or '?' ?

Question

原始语法:

错误是

Value of optional type 'Any?' not unwrapped; did you mean to use '!' or '?'? on result variable

FBSDKGraphRequest(graphPath: "me", parameters: parameter).start { (connection, result, error) in
        if error != nil {
            print(error)
            return
        }
        if let email = result["email"] as? String {
            print(email)
        }
    }

Answer 1

如果 result 应该是一个字典，您必须选择向下转换并将 Any? 解包为预期的类型:

if let item = result as? [String:Any],
   let email = item["email"] as? String {
        print(email)
}