如何找到与UIScrollView框架的中心x相等的contentView的x坐标

Question

I have a UIScrollView that scrolls horizontally. I have about 10 views lined up horizontally in that scrollview. I want to find the view that contains the center point of the scrollview's frame (not contentView.frame) as it scrolls. I am thinking to use the - (void)scrollViewDidScroll:(UIScrollView *)scrollView UIScrollView delegate method, but I am not sure how to find this.

Thanks!

Answer 1

You can get the start-point of a frame of a view ( myChildView ) in the reference of another view ( scrollView ) using the following code:

CGPoint origin = [myChildView convertPoint:CGPointMake(myChildView.bounds.origin.x, myChildView.bounds.origin.y) toView:[self scrollView]];

Use the scrollViewDidScroll: delegate method to pick your views and perform the calculations there.