[ios] Swift addsubview and remove it

I want to add sub view and remove with one tap. This is my code:

/* To add subview */

var testView: UIView = UIView(frame: CGRectMake(0, 0, 320, 568))
testView.backgroundColor = UIColor.blueColor()
testView.alpha = 0.5
testView.tag = 100
super.view.userInteractionEnabled = false
self.view.userInteractionEnabled = true
self.view.addSubview(testView)

/* To remove subview */

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
    let touch = touches.anyObject() as UITouch
    let point = touch.locationInView(self.view)

    if(testView.tag==100){
        println("Tag 100")
        testView.removeFromSuperview()
    }
    else{
        println("tag not found")
    }

}

But the remove it isn't working Someone can help me please? Thanks!

Assuming you have access to it via outlets or programmatic code, you can remove it by referencing your view foo and the removeFromSuperview method

foo.removeFromSuperview()

I've a view inside my custom CollectionViewCell, and embedding a graph on that view. In order to refresh it, I've to check if there is already a graph placed on that view, remove it and then apply new. Here's the solution

cell.cellView.addSubview(graph)
graph.tag = 10

now, in code block where you want to remove it (in your case gestureRecognizerFunction)

if let removable = cell.cellView.viewWithTag(10){
   removable.removeFromSuperview()
}

to embed it again

cell.cellView.addSubview(graph)
graph.tag = 10

You have to use the viewWithTag function to find the view with the given tag.

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
    let touch = touches.anyObject() as UITouch
    let point = touch.locationInView(self.view)

    if let viewWithTag = self.view.viewWithTag(100) {
        print("Tag 100")
        viewWithTag.removeFromSuperview()
    } else {
        print("tag not found")
    }
}

Tested this code using XCode 8 and Swift 3

To Add Custom View to SuperView use:

self.view.addSubview(myView)

To Remove Custom View from Superview use:

self.view.willRemoveSubview(myView)