问题人生[20160330] -[NSCFString containsString:]: unrecognized selector sent to instance 0x7f9902724da0
进行字符串搜索比对时用到的方法 containsString，在iOS7中运行时发生崩溃:app -[NSCFString containsString:]: unrecognized selector sent to instance 0x7f9902724da0 查询API文档可知containsString的定义以下测试 - (BOOL)containsString:(NSString *)
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