問題人生[20160330] -[NSCFString containsString:]: unrecognized selector sent to instance 0x7f9902724da0

進行字符串搜索比對時用到的方法 containsString，在iOS7中運行時發生崩潰:app -[NSCFString containsString:]: unrecognized selector sent to instance 0x7f9902724da0 查詢API文檔可知containsString的定義以下測試 - (BOOL)containsString:(NSString *)

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