18 Your first class, when I name the class BNRPerson,

Objective-C Programming (2nd Edition) 18. Your First Class
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18 Your first class, when I name the class BNRPerson, and click next, my xcode just shut down itself. :astonished: And computer says that Xcode quit unexpectedly,please click reopen. :imp:
My xcode version is 6.2. Why？ :question:
I have tried many times, my xcode quits itself everytime.

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尝试更新到最新版本试试？ Xcode 7.3