iOS: Add subview with a fix position on screen

Question

How do I fix a subviews position on screen (especially in UIScrollView and UITableView)? I think in storyboard

[self.view addSubview:aSubView];

Answer 1

It can be done, by moving sub (your) view from UIScrollView to super view of scrollview.

Here is simple example:
Place/set your button over scroll view (not inside scroll view) as shown here in this snapshot. And also set button constraints (position) with respect to super view of your scrollview.

Here is ref. snapshot of hierarchy of position of each view over each-other.