CODEWITHSUNDEEP
ioscocoa-touchuiviewuikit
pmerino
pmerino

Reputation: 6110

Check if a subview is in a view

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];
    }

}

Upvotes: 100

Views: 91155

Answers (7)

shubham
shubham

Reputation: 631

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.
}

Upvotes: 0

user866214
user866214

Reputation:

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()
    }
}

Upvotes: 276

JaySH
JaySH

Reputation: 585

The Swift equivalent will look something like this:

if(!myView.isDescendantOfView(self.view)) {
    self.view.addSubview(myView)
} else {
    myView.removeFromSuperview()
}

Upvotes: 4

Saran
Saran

Reputation: 6392

Your if condition should go like

if (!([rootView subviews] containsObject:[self popoverView])) { 
    [rootView addSubview:[self popoverView]];
} else {
    [[self popoverView] removeFromSuperview];

}

Upvotes: 1

Michael Frederick
Michael Frederick

Reputation: 16714

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

Upvotes: 11

Jason Harwig
Jason Harwig

Reputation: 45531

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]];         
    }
}

Upvotes: 1

Mark Granoff
Mark Granoff

Reputation: 16938

Try this:

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

Upvotes: 19

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