ios - Constraint broke UIButton on iPhone -

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i have universal app using auto layout, unknown reason, constraint have on uibutton causing button not respond on iphone (works fine on ipad). below snapshot of .xib view embedded inside uiscrollview.

enter image description here

note "(read drug facts...)" standard uibutton doesn't respond click on iphone. however, when changed top spacing between dose label , body view, responded clicks. but, when reduced spacing constant 40 down 10 button won't respond anymore. don't see view invisibly hiding button.

update 1: matt reminding me of great view debugging feature i've forgotten about. view debugging, i'm unable find culprit. please see images below.

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enter image description here


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