how to execute some code after execution of another class method code?

Question

I have a common web services class. in that class I have written method getcitydetail(). I want to populate that city detail after getting the result.

I have written following code in viewDidload:

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
   let objWebService = NTMWebServices()
    objWebService.getCityDetail()
}

After execution of getcitydetail, I want to do some operation here. I think we can do it using closure in swift. but I didn't get an idea how to use it.

score 0 · Accepted Answer · answered May 19 '16 at 06:23

To use a closure in this situation try something like

func getCityDetail (completion:()->()){

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0)) {

        //background thread, do ws related stuff, the ws should block until finished here

        dispatch_async(dispatch_get_main_queue()) {
            completion() //main thread, handle completion
        }
    }
}

then you can use it like

objWebService.getCityDetail {
   //do something when the ws is complete
}

score 0 · Answer 2 · edited May 23 '17 at 11:59

You can try any of these:

If getCityDetail() is asynchronous request then, Use Delegate to respond with the result to the registered class. Ex:

NSURLConnection.sendAsynchronousRequest(request, queue: queue, completionHandler:{ (response: NSURLResponse!, data: NSData!, error:

NSError!) -> Void in

    // Handle incoming data like you would in synchronous request
    var reply = NSString(data: data, encoding: NSUTF8StringEncoding)
    // Conform to the protocol with the results here
})

iOS Swift Pass Closure as Property? - As here u can use the closure as property and can communicate between the classes

how to execute some code after execution of another class method code?

2 Answers2