Custom Class view and selector reference - ios

Question

I'm making a custom class that just has some basic functions I can reuse once the class is initialized in any viewController. The problem is I don't know how to refer to the view or any functions being called in the #selector and I get the error: use of unresolved identifier "view". Anyone know how that's done? The sample below is to create a new UIButton.
import Foundation
import UIKit
class Utils {
var newUpdatesBtn: UIButton!
func setupButtonNewUpdates() {
newUpdatesBtn = UIButton(type: UIButtonType.System) // .System
newUpdatesBtn.setTitle("New Updates", forState: UIControlState.Normal)
newUpdatesBtn.bounds = CGRect(x: 0, y: 0, width: 123, height: 27)
newUpdatesBtn.center = CGPoint(x: view.bounds.width / 2, y: 90) // 80 point button, 20 point status bar, 40 point half button, 8 point margins
newUpdatesBtn.setBackgroundImage(UIImage(named: "new-updates"), forState: UIControlState.Normal)
newUpdatesBtn.titleLabel?.font = UIFont.systemFontOfSize(14)
newUpdatesBtn.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Normal)
newUpdatesBtn.addTarget(self, action: #selector(newUpdatesButtonPressed), forControlEvents: UIControlEvents.TouchUpInside)
self.newUpdatesBtn.alpha = 0;
self.navigationController!.view.addSubview(newUpdatesBtn)
UIView.animateWithDuration(0.3, animations: { () -> Void in
self.newUpdatesBtn.alpha = 1;
})
}
}
(problem lines)
view.bounds.width
newUpdatesBtn.addTarget(self, action: #selector(newUpdatesButtonPressed), forControlEvents: UIControlEvents.TouchUpInside)

Answer 1

This is because you have not set any reference in view property.
You can do like this:
func setupButtonNewUpdates(targetView:UIView)
{
newUpdatesBtn = UIButton(type: UIButtonType.System) // .System
.
.
.
newUpdatesBtn.center = CGPoint(x: targetView.bounds.width / 2, y: 90) // 80 point button, 20 point status bar, 40 point half button, 8 point margins
.
.
.
targetView.addSubView(newUpdatesBtn);
}
Now whenever you call this method from any viewcontroller just pass the view of that VC. for example:
var util:Utils = new Utils();
util.setupButtonNewUpdates(self.view);