Accessing ViewController class from another class in Swift

Question

I'm new in iOS development,

I have and "API Helper" Swift class that gets some data as a JSON array. And when the array is ready I want to call a method in my MasterViewController to update the tableView with the data.

I tried to do like that:

var facilities : [Facility]? {
        didSet {

            MasterViewController().facilitiesLoaded()
        }
    }

And then reload the tableView but without seeing anything.

I think the problem is that I'm creating a new instance of the ViewController, but what I should have is to get access to the current instance of the class.

Any idea, or a better design? Thanks..

You are creating a new object and invoking a method in it, not calling your existing MasterViewController. Maybe a better design would be to either use a callback block or use NSNotifications. — dcestari
– dcestari, Commented Jun 16, 2015 at 13:02
Can you please give me a good example in Swift (or a link to) about the callback block, thanks.. — Hashem
– Hashem, Commented Jun 16, 2015 at 13:21

Kushagra · Accepted Answer · 2015-06-16 13:04:50Z

1

If this "facilities" variable is instance of MasterViewController then do :

var facilities : [Facility]? {
didSet {
        self.facilitiesLoaded()
    }
}

answered Jun 16, 2015 at 13:04

Kushagra

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1 Comment

Hashem Over a year ago

No, it's not, I'm trying to set all data sources in one separate and shared class.

Hashem · Accepted Answer · 2015-06-16 14:10:24Z

1

Thanks to @dcestari,

I did added callback blocks to the API call and handled it in the ViewController and that did the trick

In API caller method:

func loadFacilities(completionHandler:(() -> Void!)) {
    // do stuff
    completionHander()
}

In the ViewController:

func getFacilities() {
        api.loadFacilities({
             // update tableView
        })
    }

answered Jun 16, 2015 at 14:10

Hashem

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