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question about protocol
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question about protocol

  • Subject: question about protocol
  • From: bigpig <email@hidden>
  • Date: Mon, 14 Mar 2016 18:12:03 +0800
Hi everyone
I get confused in SDWebImage code.The author declare a custom protocol “SDWebImageOperation” and have only a method “- (void)cancel”.Then some class comply with this protocol and implement the method “cancel”.But this protocol does not do anything,why write this way.why not every class which comply with this protocol implement a interface named cancel.

Thanks!!!!!!
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