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this error ，how to solve this error？

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Rob
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shu
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    plz write down the sourcecode in sourecodeblock and dont upload as image – xs6 Jan 07 '16 at 07:47
  • Have you read about categories and what they can and can't do? – Wain Jan 07 '16 at 07:50
  • See the below link it may helps: http://stackoverflow.com/questions/2846218/how-do-i-use-objc-setassociatedobject-objc-getassociatedobject-inside-an-object – Mahendra Kumar Jan 07 '16 at 07:53
  • You haven't implemented the method in the category. – trojanfoe Jan 07 '16 at 07:53
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    The error messages seem quite clear - you haven't implemented the function that you declared in the category and you have called a function that hasn't been declared – Paulw11 Jan 07 '16 at 07:53

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