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Swift:fetchedResultsController.getter:致命错误:在展开Optional值时意外发现nil

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I was doing a chat app, but when running it, it showed that in fetchedResultsController.getter(closure #1),there is a fatal error:unexpectedly found nil while unwrapping an Optional value. I double checked it, but found nothing wrong. Could you help me fix it?I was doing a chat app, but when running it, it




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