ios - How to add a button floating above the UIScrollView? -


let have uiscrollview , button, how can set button floating above uiscrollview or window? (or stick button in center of screen no matter how scroll).

any suggestion appreciated.

assuming working storyboard, add button above scroll view , not inside it. might want set constraints of button superview of scrollview , button make independent of scroll view.

so this:

example


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