判读字符串中是否包含中文

    -(BOOL)isChinese:(NSString *)str{

        NSString *match=@"(^[\u4e00-\u9fa5]+$)";

        NSPredicate *predicate = [NSPredicatepredicateWithFormat:@"SELF matches %@", match];

        return [predicateevaluateWithObject:str];

    }