CODEWITHSUNDEEP
iosswiftuiview
Isha Balla
Isha Balla

Reputation: 763

How to check whether a view already exists in my Application Window?

class func showNotificationWithTitleWarning(controller:UIViewController,title :String, subtitle :String){

        let subtitle = subtitle
        var isTrue : Bool = false


        //let horizontalPadding:CGFloat = 0.0
        let deviceWidth:CGFloat = Device.DeviceWidth
        //let deviceHeight:CGFloat = Device.DeviceHeight
        let height:CGFloat = 64.0

        let contentFrame:CGRect = CGRectMake(0,0 , deviceWidth ,height)

        var toastView:CustomTopNotification!
               toastView = CustomTopNotification(frame:contentFrame,Str_title:subtitle)

        if  toastView.superview === UIApplication.sharedApplication().delegate?.window!! {


                        toastView.removeFromSuperview()
            print("Already there")

        } else {
            UIApplication.sharedApplication().delegate?.window!!.addSubview(toastView)


            toastView.frame.origin.y = -80

            UIView.animateWithDuration(0.2, delay: 0.0, options: UIViewAnimationOptions.CurveEaseOut, animations: {
                toastView.frame.origin.y =  0
                controller.view.layoutIfNeeded()

                },completion: {_ in

            })

        }

    }

This is my block of code. However, it never enters the if block. The thing I want to achieve is to not add the view continuously if it already exists there. If the view already exists in the application window,I want it to do nothing. However, it is adding the view everytime the action is being called. I have tried mostly every solution proposed like isdescendantOf(),subviews.contains().. But none has worked so far

Upvotes: 3

Views: 1862

Answers (3)

Devil
Devil

Reputation: 344

You can set a tag to this view and can get "viewWithTag:" if it is returning view that means it is already added

Upvotes: 0

Shubhank
Shubhank

Reputation: 21805

Change your code to the following

class CustomNotification  {
   static let sharedInstance = CustomNotification()

   private var toastView: CustomTopNotification?
   func showNotificationWithTitleWarning(controller:UIViewController,title :String, subtitle :String){
            if let prevToastView = toastView {
                  prevToastView.removeFromSuperView()
            }
           //prev code of function here
           // change only one line in it
            toastView:CustomTopNotification!
               toastView = CustomTopNotification(frame:contentFrame,Str_title:subtitle)
        }
}

Now call your notification from anywhere like

CustomNotification.sharedInstance.showNotificationWithTitleWarning()

Upvotes: 2

Bharath Vankireddy
Bharath Vankireddy

Reputation: 932

Try checking that toastView has superview or not. If not , then add it. Following if condition executes when toastView has not added on any view.

if  ! toastView.superview

Upvotes: 0

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