iOS - Map a root JSON array with ObjectMapper in swift

Using JSONObjectWithData(::) with the correct conditional downcasting type

Your JSON is of type [[String: AnyObject]]. Therefore, with Swift 2, you can use JSONObjectWithData(::) with a conditional downcasting of type [[String: AnyObject]] in order to prevent using NSArray or AnyObject!:

do {
    if let jsonArray = try NSJSONSerialization
        .JSONObjectWithData(data, options: []) as? [[String: AnyObject]] {
        /* perform your ObjectMapper's mapping operation here */
    } else {
        /* ... */
    }
}
catch let error as NSError {
    print(error)
}

---

Mapping to Customer using mapArray(:) method

The ObjectMapper's Mapper class provides a method called mapArray(:) that has the following declaration:

public func mapArray(JSONArray: [[String : AnyObject]]) -> [N]?

The ObjectMapper documentation states about it:

Maps an array of JSON dictionary to an array of Mappable objects

Thus, your final code should look something like this:

do {
    if let jsonArray = try NSJSONSerialization
        .JSONObjectWithData(data, options: []) as? [[String: AnyObject]] {
        let customerArray = Mapper<Customer>().mapArray(jsonArray)
        print(customerArray) // customerArray is of type [Customer]?
    } else {
        /* ... */
    }
}
catch let error as NSError {
    print(error)
}

---

Mapping to Customer using map(:) method

The ObjectMapper's Mapper class provides a method called map(:) that has the following declaration:

func map(JSONDictionary: [String : AnyObject]) -> N?

The ObjectMapper documentation states about it:

Maps a JSON dictionary to an object that conforms to Mappable

As an alternative to the previous code, the following code shows how to map your JSON to Customer using map(:):

do {
    if let jsonArray = try NSJSONSerialization
        .JSONObjectWithData(data, options: []) as? [[String: AnyObject]] {
        for element in jsonArray {
            let customer = Mapper<Customer>().map(element)
            print(customer) // customer is of type Customer?
        }
    } else {
        /* ... */
    }
}
catch let error as NSError {
    print(error)
}

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.