objective c - UIButton error with SKPayment -

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i used tutorial how add in-app purchase ios application? skpayment (verbatim) , having trouble linking purchase buttons on storyboard code. 

- (ibaction)purchase:(skproduct *)product{

i keep getting following error. 

[uibutton productidentifier]: unrecognized selector sent instance 0x7ffa08cfbe90

i understand tutorial uses xib file using storyboard file game link buttons. can please tell me how link purchase button in storyboard the

- (ibaction)purchase:(skproduct *)product{

code without getting unrecognized selector error?

it's because ibaction expects sender first parameter. , when it's "linked" uibutton, uibutton sender (it's automatically sent). why error, uibutton doesn't know selector productidentifier.

if answer linked on so, methods linked ib aren't one. 1 called [self purchase:someskproduct], that's why it's not causing crash on his/her code.

well, haven't played storekitframework, seems method shouldn't ibaction (either here on on answer, it's confusing, proof: current issue.). should -(void)purchase:(skproduct *)product.


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