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How do I tell if a UIView is visible and on screen?

Anonymous User 3215 17-Aug-2015

If I have a UIView (or UIView subclass) that is visible, how can I tell if it's currently being shown on the screen (as opposed to, for example, being in a section of a scroll view that is currently off-screen)?

 

To maybe give you a better idea of what I mean, UITableView has a couple of methods for determining the set of currently visible cells. I'm looking for some code that can make a similar determination for any given UIView.

iphone iphone  ios  objective c 
Updated on 17-Aug-2015
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Tarun Kumar

Tarun Kumar

17-Aug-2015

I recently had to check whether my view was onscreen. This worked for me:

CGRect viewFrame = self.view.frame;
CGRect appFrame = [[UIScreen mainScreen] applicationFrame];
 
// We may have received messages while this tableview is offscreen
if(CGRectIntersectsRect(viewFrame, appFrame)) {
    // Do work here
}

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