Uitableview when scrolling past a certain point - ios

Question

i have looked through basically every single stack overflow question on this, but i cant find an answer. None of the answers seem to work.
I am writing an application that has a tableview in it, with a uitableview as a subview.
The uitableview is datasource and delegate connected to a class called xvalues, which is a subclass of uitableviewcontroller. i also have a class, where i load a custom uitableviewcell. This all doesn't cause any errors.
Here is my code for the uitableview, in xvalues:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
tableviewcell *cell = [[tableviewcell alloc]initWithFrame:CGRectZero];
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
// Navigation logic may go here. Create and push another view controller.
/*
<#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:#"<#Nib name#>" bundle:nil];
// ...
// Pass the selected object to the new view controller.
[self.navigationController pushViewController:detailViewController animated:YES];
[detailViewController release];
*/
}
I removed some commented out methods such as can edit row at index path and commit editing style.
In cellforrowatindexpath, tableviewcell is my custom cell class.
From this, when i run my code, it loads up my uitableview, with 1 cell, with my custom cell.
However, now, if i click and drag, it works for dragging about an inch, and then suddenly crashes with the error:
2012-07-16 12:14:16.957 spreadsheet[68717:f803] -[__NSCFString tableView:cellForRowAtIndexPath:]: unrecognized selector sent to instance 0x6894400
2012-07-16 12:14:16.960 spreadsheet[68717:f803] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString tableView:cellForRowAtIndexPath:]: unrecognized selector sent to instance 0x6894400'
*** First throw call stack: blah blah blah
It also happens when i click on the row, but i think that is because of my did select row at index path method.
If anyone could help me it would be amazingly helpful.

Answer 1

Your table view controller is getting deallocated. Make sure you’re retaining your xvalues instance (or assigning it to a strong property on something, like your app delegate) wherever you’re creating it.