Extension,Selector & add subview via Extension - ios

Question

I have a common functionality of displaying a corner settings list in almost all pages of my application. I have thought of using extension to achieve this common functionality.
My Code -
I created a NSObject subclass and within it had an extension of UIViewController -
import UIKit
class viewControllerExtension: NSObject
{
}
extension UIViewController
{
func setCornerSettingsTableView()
{
let maskView = UIView()
maskView.frame = self.view.bounds
maskView.backgroundColor = UIColor.lightGrayColor()
let tableView = self.storyboard?.instantiateViewControllerWithIdentifier("cornerSettingVC") as! cornerSettingVC
addChildViewController(tableView)
tableView.view.frame = CGRectMake(maskView.frame.width-maskView.frame.width/2.5, 0,self.view.frame.width/2.5, self.view.frame.height-200)
maskView.addSubview(tableView.view)
let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "dismissMaskView")
maskView.addGestureRecognizer(tap)
self.view.addSubview(maskView)
}
func dismissMaskView()
{
print("dismiss called")//function called but how to dismiss the mask View
}
}
Usage - In any view controller where I need to display i just call - setCornerSettingsTableView()
Problem - As you can see I am trying to add a tap gesture recognizer to my mask view so that whenever user taps the mask view, it removes the mask view along with the table view in it, but I am unable to achieve that.
If any alternative suggestions for this are most welcome.

Answer 1

extension UIViewController
{
func setCornerSettingsTableView()
{
if let theMask = self.view.viewWithTag(666) as? UIView {
return // already setted..
} else {
let maskView = UIView()
maskView.tag = 666
maskView.frame = self.view.bounds
maskView.backgroundColor = UIColor.lightGrayColor()
let tableView = self.storyboard?.instantiateViewControllerWithIdentifier("cornerSettingVC") as! cornerSettingVC
addChildViewController(tableView)
tableView.view.frame = CGRectMake(maskView.frame.width-maskView.frame.width/2.5, 0,self.view.frame.width/2.5, self.view.frame.height-200)
maskView.addSubview(tableView.view)
let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "dismissMaskView")
maskView.addGestureRecognizer(tap)
self.view.addSubview(maskView)
}
}
func dismissMaskView()
{
print("dismiss called")//function called but how to dismiss the mask View
if let theMask = self.view.viewWithTag(666) as? UIView {
theMask.removeFromSuperview()
}
}
}