我对iOS编程非常陌生。我只是想让一个按钮点击事件,当我运行模拟器时,出现一个异常。
2014-10-27 12:00:00.859 practiceapp[682:28288] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<ViewController 0x7f95fb721120> setValue:forUndefinedKey:]: this class is not key value coding-compliant for th