2015-01-27 10:02:42.278 MSLife[568:60b] -[NSNull length]: unrecognized selector sent to instance 0xcfc068
2015-01-27 10:02:42.281 MSLife[568:60b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSNull length]: unrecognized selector sent to instance 0xcfc068'
请求数据为null时,如何判断?
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