Creating a nested array from a single array - ios

Question

I have a search function in my app which gets data from a fetchedResultsController. The problem is when I display the filtered data in the tableView everytime it gets to a new section, the array starts over and over (due to indexPath.row being 0 everytime indexPath.section increments). I've never been good at nested arrays and I thought this is the perfect time to learn them, since I can't get over my problem without this array.
So I have this array which is the filtered data out of the fetchedResultsController:
filteredItems = (fetchedResultsController.fetchedObjects?.filter({(budget : Budget) -> Bool in
return (budget.dataDescription?.lowercased().contains(searchText.lowercased()))!
}))!
How can I make an array called filteredObjects which sorts my items for sections? For example
- Section 1 ( filteredObjects[0] ):
item 1 ( filteredObjects[0][1] )
item 2 ( filteredObjects[0][2] )
-
Section 2 ( filteredObjects[1] ):
item 1 ( filteredObjects[1][0] )
etc

Answer 1

Use below method to define number of sections
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return filteredObjects.count
}
And, for number of rows
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return filteredObjects[section].count
}
And Finally, for CellForRowAtIndexpath
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
var cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! TaskTableViewCell
let currentItem = filteredObjects[indexPath.section][indexPath.row]
... Here, use currentItem as whatever it is (Object or dictionary)
return cell
}

Answer 2

let budgets = [Budget]()
let searchResult = [Budget]()
You should always use searchResult array in tableview datasource methods. initially you should add all objects of budgets array to searchResult & load table view.
when search started remove all items from searchResult and add filtered result to search result array & reload tableview.
func search(searchText:String){
searchResult.removeAll()
let result = budgets.filter({
var budget = $0
let filtered = budget.expenses.filter({
if let deptName = $0.deptName{
return deptName.lowercased().contains(searchText.lowercased())
}
return false
})
budget.expenses = filtered
return budget.expenses.count != 0
})
searchResult.append(contentsOf: result)
}
struct Budget {
var expenses = [Expense]()
}
struct Expense{
var deptName:String?
}