Adding a gesture recognizer

Gesture Recognizer

// first add a clear button that covers the screen
   
// Now  add a gesture recognizer in ViewDidLoad
// with target "self" (this class)
// and selector (method) "hideCamera"
UISwipeGestureRecognizer* upSwipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(hideCamera)];

// set the direction of the swipe to up
[upSwipeRecognizer setDirection:UISwipeGestureRecognizerDirectionUp];

// add the gesture recognizer to your new button
[self.myButton addGestureRecognizer:upSwipeRecognizer];

// here is the method we call
-(void) hideCamera
{
    NSLog(@"hide camera");
    self.cameraWebView.hidden = TRUE;
}