Hi guys in Store Search project ,whenever I try to pin a navigationBar to storyboard,xcode crashes out with this message"Xcode quit unexpectedly" I’m using Xcode 9.2
@milad Thanks very much for your question!
Believe it or not, I’ve run into this problem many times myself, but not exactly as you described, but involving Interface Builder nonetheless. 
My solution is to ensure that my project is not running from an external hard drive but rather locally from my mac’s own hard drive, and make sure you have a good amount of hard drive space. I believe it has to do with Xcode’s memory consumption, and more than likely, when using Interface Builder, Xcode requires more than usual. Hence the reason for your crash.
This is just from my experience. I do hope this helps!
All the best!
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