错误纪录2－“'NSUnknownKeyException', reason: … This class is not key value coding-compliant for the key X

在.m中建立了与xib的outlet连接，不能直接改名字后再连接，不然就会报错

“'NSUnknownKeyException', reason: … This class is not key value coding-compliant for the key X”

而是应该先删除之前的outlet连接...

参考：http://stackoverflow.com/questions/3088059/what-does-this-mean-nsunknownkeyexception-reason-this-class-is-not-key