Terminating app due to uncaught exception 'NSUnknownKeyException' this class is not key valu
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Terminating app due to uncaught exception ‘NSUnknownKeyException‘, reason: ‘[ViewController > setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key backBtn.‘
第一种情况：xib文件属性输出口连接错误，IBout多连或者忘关输入口
第二种情况：引入第三方的SDK会出现错误，导入的bundle文件的nib文件出现问题，需要重新导入bundle资源文件 若公用SDK中的bundle文件里面的nib文件需要进行放在不同的路径进行调用即可，便于找到nib对应的控制器类
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