路徑：NSString *parh = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject] stringByAppendingPathComponent:@"searchHistory.plist"];

獲取：NSMutableArray *searchHistories = [NSKeyedUnarchiver unarchiveObjectWithFile:parh];

插入某條：[searchHistories removeObject:@"historyText"];

                   [searchHistories insertObject:@"historyText" atIndex:0];

                   [NSKeyedArchiver archiveRootObject:searchHistories toFile:parh];

刪除某條：[searchHistories removeObject:@"historyText"];

                   [NSKeyedArchiver archiveRootObject:searchHistories toFile:parh];

清空：[searchHistories removeAllObjects];

            [NSKeyedArchiver archiveRootObject:searchHistories toFile:parh];