UITableviewController - Update specific Cells - objective-c

Question

I have created custom cells with a button that changes the state of a row from "availible" to "bought", and I also have an UIImageview which shows the state. I want the cell to redraw with the new state when the user presses the button.
I have been able to get the UIImage to be redrawn after the User scrolls the cell out of view. This is what I have so far:
Initialization
- (void)viewDidLoad
{
[super viewDidLoad];
self.clearsSelectionOnViewWillAppear = YES;
self.contentSizeForViewInPopover = CGSizeMake(600.0, 560.0);
//[self.tableView setSeparatorStyle:UITableViewCellSeparatorStyleNone];
[self.tableView setRowHeight:60];
[self.tableView setBackgroundColor:[UIColor blackColor]];
}
Got only one section:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
And all items are in the "paketListe" array:
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [paketListe count];
}
The cellForRow function only gets called, when the cell is out of view and when the cell is initially drawn.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(#"CellForRow called!");
PaketTableViewCell *cell = [[[PaketTableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:nil] autorelease];
[cell setDelegate:self];
Paket *tempPaket = [paketListe objectAtIndex:[indexPath row]];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *userDocumentsPath = [paths objectAtIndex:0];
NSString *fileName = [NSString stringWithFormat:#"%#/%#/%#",userDocumentsPath, [tempPaket productID], [tempPaket previewPic]];
[cell setProductIndex:[indexPath row]];
//... Setting some Attributes in my custom cell, cut out for simplicity....
cell.backgroundColor = [UIColor clearColor];
return cell;
}
The code for the Button, this is a delegate call, so my custom sell calls [delegate buttonPushed:(int)];
- (void) buttonPushed:(int) myProductIndex {
NSLog(#"Pushed: %#", [[paketListe objectAtIndex:myProductIndex] productID]);
CoreDataWrapper *tempCDW = [[CoreDataWrapper alloc] init];
[tempCDW initCoreData];
Paket *tempPaket = [paketListe objectAtIndex:myProductIndex];
//Doing some work in Core Data an my "paketListe" array. Left out for simplicity...
[tempCDW release];
//Here it begins....
[[self tableView] reloadData];
[[self tableView] beginUpdates];
[[self tableView] reloadRowsAtIndexPaths:[NSArray arrayWithObject:[NSIndexPath indexPathForRow:myProductIndex inSection:0]] withRowAnimation:UITableViewRowAnimationFade];
[[self tableView] endUpdates];
}
Now I tried the reloading with different commands... Reload the whole thing with just reloadData or the begin-/endUpdate thing. Nothing refreshes the cell. After several hours of reading I think I did everything right, but no refresh.
I appreciate any help.

Answer 1

Quick and dirty:
- (void)configureCell:(PaketTableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath {
//Any cell-specific code
[cell setNeedsLayout]; //or [cell setNeedsDisplay];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
//Code to create any/a general cell
[self configureCell:cell];
return cell;
}
- (void) buttonPushed:(int) myProductIndex {
//Code to identify the cell in which your button is (use "super")
[self configureCell:cellForPushedButton];
}

Answer 2

I got to know your problem you have missed in reloadRowsAtIndexPaths "nil".
Do as i wrote below, it will work.
[self.tableView beginUpdates];
[self.tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:[NSIndexPath indexPathForRow:myProductIndex inSection:0], nil] withRowAnimation:UITableViewRowAnimationNone];
[self.tableView endUpdates];