Question

if i kept my progress bar out side of UIScrollView i am getting some x & y axis (like (110,250)), if i kept that progress bar in my UIScrollView i am getting different x & y axises (like (9,100)).

my requirement is i have to put my progress bar in UIScrollView but i want to know the x & y axis of progress bar outside the UIScrollview.

i.e my progress bar origins has to calculate with respect to UIView not respect to Scrollview

give me the solution please.

Answer 1

UIView can convert rects from one coordinate space to another so long as they have a common parent view (even the window). So, for example:

[scrollview convertRect:subview.frame toView:someOtherView];  //scrollView converts the frame of subView.frame to the coordinate system of someOtherView

There are several methods that will convert points or rects from or to another view:

[superView convertRect:anotherView.frame fromView:anotherView.superView]; //Will give you the rect of anotherView.frame in superView coordinate system.

Note that the rect can be anything (doesn’t need to be a particular view’s frame). All the method does is convert from one coordinate space to another.

Also, to find the coordinate of a view on the screen (or the main window) you can set the “toView:” to nil:

[superView convertRect:subView.frame toView:nil]; //will give you the coordinate of subView in the window