iphone - Double border to a UIButton -

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i have display uibutton in following image. button size can varying. how can that? please suggest way.

enter image description here

if want simple outline (it's little hard tell image button is), create button uibuttontypecustom (so blank slate) set background color black. next, calayer of button (through layer method) , set bordercolor , borderwidth properties desired.


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