视图的框架已经在superview的坐标系中。因此，如果您的设置是 self.view 包含 scrollview 包含 sender ：

A view's frame is already in the superview's coordinate system. So if your setup is self.view contains scrollview contains sender:

CGRect frame = [sender.superview convertRect:sender.frame toView:self.view];

// or, better:

CGRect frame = [sender convertRect:sender.bounds toView:self.view];