Swift weakSelf in closure syntax

Question

I have this code to get JSON:

Alamofire.request(.GET, worlds).responseJSON { (request, response, JSON, error) in
        println(JSON)
        //weakSelf.serverL         


        

Answer 1

You can declare a weak self reference by putting [weak self] before your closure parameters.

You can see the documentation here

Answer 2

Use the capture list. The correct syntax is:

Alamofire.request(.GET, worlds).responseJSON { [unowned self] (request, response, JSON, error) in
    println(JSON)
    self.serverList = JSON
}

However take a note that you are not creating retain cycle here, so you do not have to use weak or unowned self here. Good article on this topic: http://digitalleaves.com/blog/2015/05/demystifying-retain-cycles-in-arc/