Activity Indicator in Swift

Question

I am trying to make activity indicator using swift but there is something I am missing

Here is the code for start activity button button:

Indicator = ActivityIndicator().StartActivityIndicator(ViewController());

And here is the code for stop activity button

 ActivityIndicator().StopActivityIndicator(ViewController(),indicator: Indicator);

and code for ACtivity indicator class is

class ActivityIndicator: NSObject {

    var myActivityIndicator:UIActivityIndicatorView!

    func StartActivityIndicator(obj:UIViewController) -> UIActivityIndicatorView
    {

        self.myActivityIndicator = UIActivityIndicatorView(frame:CGRectMake(100, 100, 100, 100)) as UIActivityIndicatorView;

        self.myActivityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray
        self.myActivityIndicator.center = obj.view.center;

        obj.view.addSubview(myActivityIndicator);

        self.myActivityIndicator.startAnimating();
        return self.myActivityIndicator;
    }

    func StopActivityIndicator(obj:UIViewController,indicator:UIActivityIndicatorView)-> Void
    {
            indicator.removeFromSuperview();
    }


}

Thanks Problem Solved

while am writing code I know that time that I have to pass self in the function but at that time I didn't know What type is self referencing so I I can't receive until I know the type then I decide to try to receive different type (UIView, UIActivityIndicatorView,UIViewController) then I found That it should be UIViewController but I forgot that it should be pass with self and I looking for what to pass in function calling and I thought let's try UIViewController and it didn't give me error so I thought it's right but when it's not working I thought I am close enough so it's better to ask expert about the problem. And as I expected problem is solved within few minutes

Swift 3 version

class ActivityIndicator: NSObject {

    var myActivityIndicator:UIActivityIndicatorView!

    func StartActivityIndicator(obj:UIViewController) -> UIActivityIndicatorView
    {

        self.myActivityIndicator = UIActivityIndicatorView(frame:CGRect(x: 100, y: 100, width: 100, height: 100)) as UIActivityIndicatorView

        self.myActivityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.gray
        self.myActivityIndicator.center = obj.view.center;

        obj.view.addSubview(myActivityIndicator);

        self.myActivityIndicator.startAnimating();
        return self.myActivityIndicator;
    }

    func StopActivityIndicator(obj:UIViewController,indicator:UIActivityIndicatorView)-> Void
    {
        indicator.removeFromSuperview();
    }


}

Answer 1

It seem that every time you call start/stop,you create a new instance of ViewController Just replace ViewController to self and try

For example

Indicator = ActivityIndicator().StartActivityIndicator(self);