iPhone - Get Position of UIView within entire UIWindow

iphone cocoa-touch ios uiview uiwindow
adam picture adam · Sep 23, 2009 · Viewed 119.4k times · Source

The position of a UIView can obviously be determined by view.center or view.frame etc. but this only returns the position of the UIView in relation to it's immediate superview.

I need to determine the position of the UIView in the entire 320x480 co-ordinate system. For example, if the UIView is in a UITableViewCell it's position within the window could change dramatically irregardless of the superview.

Any ideas if and how this is possible?

Cheers :)

Answer

Nikolai Ruhe picture Nikolai Ruhe · Sep 23, 2009

That's an easy one:

[aView convertPoint:localPosition toView:nil];

... converts a point in local coordinate space to window coordinates. You can use this method to calculate a view's origin in window space like this:

[aView.superview convertPoint:aView.frame.origin toView:nil];

2014 Edit: Looking at the popularity of Matt__C's comment it seems reasonable to point out that the coordinates...

  1. don't change when rotating the device.
  2. always have their origin in the top left corner of the unrotated screen.
  3. are window coordinates: The coordinate system ist defined by the bounds of the window. The screen's and device coordinate systems are different and should not be mixed up with window coordinates.

Related questions

iPhone UIView Animation Best Practice

What is considered best practice for animating view transitions on the iPhone? For example, the ViewTransitions sample project from apple uses code like: CATransition *applicationLoadViewIn = [CATransition animation]; [applicationLoadViewIn setDuration:1]; [applicationLoadViewIn setType:kCATransitionReveal]; [applicationLoadViewIn setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn]]; [[myview layer] addAnimation:…

Read More
How to disable touch input to all views except the top-most view?

I have a view with multiple subviews. When a user taps a subview, the subview expands in size to cover most of the screen, but some of the other subviews are still visible underneath. I want my app to ignore …

Read More
Animating removeFromSuperview

I'd like to animate the transition from a subview back to the super view. I display the subview using: [UIView beginAnimations:@"curlup" context:nil]; [UIView setAnimationDelegate:self]; [UIView setAnimationDuration:.5]; [UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.view cache:YES]; [self.view addSubview:…

Read More