将全局变量传递给闭包

Question

I'm trying to implement sorting based on action sheet choice, where the sorting happens in the handler, but I can't pass the array i want to sort to the handler. Here is my code:

let byWage = UIAlertAction(title: "By Wage", style: UIAlertActionStyle.Default, handler: { action in
  unclaimedJobs.sort() { $0.wage > $1.wage }
})

where unclaimedJobs is a global variable. What's the best way to do this?

Edit: This where I declare unclaimedJobs :

class JobsListViewController: UITableViewController, UITableViewDataSource {

   var jobsList: JobsList!
   var unclaimedJobs: [Job]!

I initialize it in viewDidLoad() .

Edit#2: I understand you need a UIAlertAction to be passed to the closure, so I replaced (unclaimedJobs) with action.

Last Edit: I fixed this by putting self.unclaimedJobs instead of unclaimedJobs.

Answer 1

Not 100% sure. But I think it's this.

let byWage = UIAlertAction(title: "By Wage", style: .Default, handler: {(alert: UIAlertAction!) in unclaimedJobs.sort({$0 > $1}) })

Answer 2

If you refer to an object inside a closure, you need an explicit reference to it. In your case it's probably - self: like in self.unclaimedJobs. However, you have to unown this object like [unowned self] inside the closure, otherwise you'll have a memory leak.