iOS – Map a root JSON array with ObjectMapper in swift

I finally solve my problem :

The mapping method in the controller should be

let json : AnyObject! = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &error)

if (error != nil) {
    return completionHandler(nil, error)
} else {
    var customer = Mapper<Customer>().mapArray(json)! //Swift 2
    var customer = Mapper<Customer>().mapArray(JSONArray: json)! //Swift 3
}

If it can help someone.