get UIButton inside an UIScrollView absolute screen location

Your objection was right- instead, use

- (CGPoint)convertPoint:(CGPoint)point toView:(UIView *)view

from UIView, like

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

Not tested, but I believe that should work. Also see iPhone - Get Position of UIView within entire UIWindow

For swift:

let pointXY:CGPoint = (button.superview?.convert(button.frame.origin, to: nil))!
print("button pointXY: \(pointXY.debugDescription)")

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