Check if a subview is in a view - ios

Question

I'm making an app where I add a subview to a view using addSubview: on an IBAction. In the same way, when the button with that IBAction is touched again should call removeFromSuperview on that subview added on that IBAction:
PSEUDO CODE
-(IBAction)showPopup:(id)sender
{
System_monitorAppDelegate *delegate = (System_monitorAppDelegate *)[[UIApplication sharedApplication] delegate];
UIView *rootView = delegate.window.rootViewController.view;
if([self popoverView] is not on rootView)
{
[rootView addSubview:[self popoverView]];
}
else
{
[[self popoverView] removeFromSuperview];
}
}

Answer 1

You are probably looking for UIView's -(BOOL)isDescendantOfView:(UIView *)view; taken in UIView class reference.
Return Value
YES if the receiver is an immediate or distant
subview of view or if view is the receiver itself; otherwise NO.
You will end up with a code like :
Objective-C
- (IBAction)showPopup:(id)sender {
if(![self.myView isDescendantOfView:self.view]) {
[self.view addSubview:self.myView];
} else {
[self.myView removeFromSuperview];
}
}
Swift 3
#IBAction func showPopup(sender: AnyObject) {
if !self.myView.isDescendant(of: self.view) {
self.view.addSubview(self.myView)
} else {
self.myView.removeFromSuperview()
}
}

Answer 2

Try this:
-(IBAction)showPopup:(id)sender
{
if (!myView.superview)
[self.view addSubview:myView];
else
[myView removeFromSuperview];
}

Answer 3

UIView *subview = ...;
if([self.view.subviews containsObject:subview]) {
...
}

Answer 4

The Swift equivalent will look something like this:
if(!myView.isDescendantOfView(self.view)) {
self.view.addSubview(myView)
} else {
myView.removeFromSuperview()
}

Answer 5

Check the superview of the subview...
-(IBAction)showPopup:(id)sender {
if([[self myView] superview] == self.view) {
[[self myView] removeFromSuperview];
} else {
[self.view addSubview:[self myView]];
}
}

Answer 6

Your if condition should go like
if (!([rootView subviews] containsObject:[self popoverView])) {
[rootView addSubview:[self popoverView]];
} else {
[[self popoverView] removeFromSuperview];
}

Answer 7

Here we used two different views. Parent view is the view in which we are searching for descendant view and check wether added to parent view or not.
if parentView.subviews.contains(descendantView) {
// descendant view added to the parent view.
}else{
// descendant view not added to the parent view.
}