How to parse JSON in background thread after Alamofire request finishes?

How to parse JSON in background thread after Alamofire request finishes?

After getting JSON data from Alamofire request, I want to parse it on background thread, because, parsing process is difficult and has some logic in my case. The first idea to solve was executing a async operation on background thread with synchronous request with Alamofire. But, as I've read, Alamofire works completely asynchronously. The second solution of mine was executing a parsing JSON process in another thread after responseJSON of Alamofire gets called. After it completes, I will update my UI in main thread. Here is how it looks:

After getting JSON data from Alamofire request, I want to parse it on background thread, because, parsing process is difficult and has some logic in my case. The first idea to solve was executing a async operation on background thread with synchronous request with Alamofire. But, as I've read, Alamofire works completely asynchronously. The second solution of mine was executing a parsing JSON process in another thread after responseJSON of Alamofire gets called. After it completes, I will update my UI in main thread. Here is how it looks:

.responseJSON { (response) in //callback of Alamofire
    if response.result.isSuccess {
        let json = JSON(response.result.value!)
        DispatchQueue(label: "parsing", qos: .userInitiated).async {
            self.parseJSON(json)
            DispatchQueue.main.async {
                self.updateUI()
            }
        }
    }
}

But is it a good approach to solve this problem? I just don't want to parse a JSON on main thread, because parsing process has a couple of for loops and other operations, and, I think it cause on drawing of UI related stuff.

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