Message.swift

struct Message {
    let text: String
    let status: Status

    init?(dictionary: NSDictionary) {
        guard
            let text = dictionary["text"] as? String,
            let statusString = dictionary["status"] as? String,
            let status = Status(rawValue: statusString)
        else { return nil }

        self.text = text
        self.status = status
    }
}