Swift 3 range exception?

Asked Jul 19 '17 at 15:11

Active Oct 04 '17 at 22:16

Viewed 151 times

let x = self.tableProduct.count
self.tableProduct = products
self.tableView.beginUpdates()
var insertedIndexPaths = [IndexPath]()
for i in x..<self.tableProduct.count {
    print("No : \(i)")
    insertedIndexPaths.append(IndexPath(row: i, section: 0))
}
print("Count = \(self.tableProduct.count)")
print(insertedIndexPaths)
self.tableView.insertRows(at: insertedIndexPaths, with: .none)
self.tableView.endUpdates()

Here x is the current array count. Since I'm fetching in background after assigning I update array in second line. Then I start updating table view. Lets say initially my table has 50 records that is x, then I want to add row from 51 to self.tableProduct.count which is 100. In for loop I add index path my first index path is [0,51] and last index path looks like [0,99]. Then I start to insert my new rows, here it throws

Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 17 beyond bounds [0 .. 16]'

error.When I add breakpoint to error it shows error in tableView.endUpdates() line.Here what I'm doing wrong? How can I solve this error? Thanks in advance.

edited Jul 20 '17 at 02:44

Dávid Pásztor

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asked Jul 19 '17 at 15:11

e.k

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remove the line `tableview.endUpdates()` – Samarth Kejriwal Jul 19 '17 at 15:19
then It won't update the table Samarth Kejriwal – e.k Jul 19 '17 at 15:25
use `tableView.reloaddata()` instead of `tableview.endUpdates()` – Samarth Kejriwal Jul 19 '17 at 15:27
then it will start from beginning.There is no use in adding rows. – e.k Jul 19 '17 at 15:28
Why do you want to add rows manually in the tableview? Whenever you fetch data dynamically then store it in your array and load the cell with your data.Simple – Samarth Kejriwal Jul 19 '17 at 15:38
I'm having minimum of 20k records. If I did tableview.reloaddata() it will again reload all the data. – e.k Jul 19 '17 at 15:46
read my latest comment – Samarth Kejriwal Jul 19 '17 at 15:49
I think you don't understand reload will reload all the records which means it reloads from 0 to 100 but add adds from 51 to 100 there is a huge difference in it. – e.k Jul 19 '17 at 16:05
If you're doing this in the background, it's likely that you have some kind of race condition. It looks like you're changing the range values while you're looping. – u84six Jul 19 '17 at 17:56
no it is in main thread. I create new instance of array before looping so the count won't change. – e.k Jul 20 '17 at 04:44

Swift 3 range exception?

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