How to get center of the displayed area in UIScrollView?

Question

Set up a UIScrollView of height 1400 with numerous UIButtons. On clicking each of these UIButtons, i reveal a small UIView(hidden when view is loaded) containing some values. I want to display these UIViews at the center of the displayed area of the UIScrollView.

When i click 'TYPE'(behind the UIView in the image), i reveal the view as shown below:

But no matter where 'TYPE' button is and when clicked i want to reveal UIView as shown below(always at the center of the displayed area):

Thanks!

Answer 1

Try this

yourCustomAlert.center = self.view.center;

Inside your scrollView

1. first get visible Rect of scrollview

   CGRect visibleRect = CGRectMake(myScrollView.contentOffset.x, myScrollView.contentOffset.y, myScrollView.bounds.size.width, myScrollView.bounds.size.height)
   

2. then get it's center

   CGPoint centerPoint = CGPointMake(visibleRect.size.width/2, visibleRect.size.height/2);
   

3. then set your alertView's center

   yourCustomAlert.center = centerPoint;
   

Answer 2

Your problem is not clear as much. Though, if you want that your hidden view will appear on the center of the screen despite of the scrollView bounds, you can use

yourHiddenView.center = self.view.center; //If Parent class is a ViewController
//yourHiddenView.hidden = NO;

OR

yourHiddenView.center = self.center; //If Parent class is a UIView
//yourHiddenView.hidden = NO;

And, if you want the hidden view to be at the center of ScrollView find the visible rect of the scrollView and find its center

CGRect visibleRect;
visibleRect.origin = scrollView.contentOffset;
visibleRect.size = scrollView.bounds.size;

CGPoint scrollViewCenter = CGPointMake(visibleRect.size.width/2, visibleRect.size.height/2);

yourHiddenView.center = scrollViewCenter;
//yourHiddenView.hidden = NO;