[swift-dev] about NSDictionary question

[张辉]

HI everybody:


I have a question about NSDictionary.
I defined a instance of NSDictionary, when I set value to this instance , it throw a exception.


code:

let userDict = NSDictionary()

userDict.setValue(self.userName.text!, forUndefinedKey: "userName2")




exception:

2016-02-24 00:50:26.931 TravelAssistant[1900:792534] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<__NSDictionary0 0x7fc430404810> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key userName2.'




How to fix this bug?





thx.
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