如果我向下滚动或不向下滚动，我将在UIScrollView中获得与UIButton相同的位置

Question

I want to get the position of a UIButton inside a UIScrollView the problem is that i get the same position for when the UIButton is in it's original position or if I scroll down…

I'm using NSLog to print the position and I get the same output

• Without scroll down i get...

   2014-11-05 19:28:02.564 ... {{260, 163}, {370, 225}} 

• Even if I scroll down I get the same output...

   2014-11-05 19:28:06.052 ... {{260, 163}, {370, 225}} 

This is the code i'm using to obtain the position of the UIButton inside the UIScrollView ...

NSLog(@"%@", NSStringFromCGRect(CGRectMake(myButton.frame.origin.x, myButton.frame.origin.y, myScrollDown.frame.size.width, myScrollDown.frame.size.height)));

There is a way to get the actual position of the UIButton even after I scrolled down?

There is another way to get the position of the UIButton inside the ScrollView?

I've already visited the following links and I have not resolved it yet.

get UIButton inside an UIScrollView absolute screen location

iPhone - Get Position of UIView within entire UIWindow

Cocoa: What's the difference between the frame and the bounds?

Thanks for any help!

Answer 1

也许你可以试试看

NSLog(NSStringFromCGRect([self.view convertRect:myButton.frame fromView:myButton.superview]));

Answer 2

You're getting the position within the scrollview. Probably what you want is the position within the scrollview's superview (perhaps self.view, perhaps something else).

Answer 3

Your scroll view is going to have a contentOffset value. The frame of the subviews inside of the scroll view don't change when it scrolls. Instead, this contentOffset value is changed. I'm sure there are better ways to do this but on a basic level, you could just do something like so to get the frame in the scroll view's superview:

CGRect frame = myButton.frame;
frame.origin.x -= scrollView.contentOffset.x;
frame.origin.y -= scrollView.contentOffset.y;
NSLog(@"%@", NSStringFromCGRect(frame);