Objective-c我需要从UItableview获取一个数组的字符串

I have a tableview that the rows are been filled with the name of .csv files that are in the document directory, i need to open the .csv that is been selected in the row and then show the info in a detail view. I'm trying to get the indexPath.row that it's been selected to get the correct element in the array but is crashing here's is that part of the code and above i will post the full code:I have a tableview that the rows are been fille