Type ‘Any’ Has no Subscript Members in Xcode 8.1 Swift 3

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You need to cast snapshot.value as? [String: AnyObject] first because the compiler does not know what type of snapshot.value is.

Like this:

    if let value = snapshot.value as? [String: AnyObject] {

        let title = value["title"] as! String
        let message = value["message"] as! String
        self.posts.insert(contentsOf: postStruct(title: title, message: message), at: index, 0)
        self.tableView.reloadData()    
    }

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