UITableView Crashes when scrolling and [reloadData] - iphone

Question

I'm creating a app using theos (jailbreak) and I have created a UITableView in the loadView method in my RootViewController.mm file:
- (void)loadView {
self.view = [[[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]] autorelease];
self.view.backgroundColor = [UIColor redColor];
NSError * error;
NSArray * directoryContents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:#"/var/mobile/Library/BannerImage" error:&error];
countries = [NSDictionary dictionaryWithObject:directoryContents forKey:#"Themes"];
mainTableView = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, 320, 480) style:UITableViewStyleGrouped];
[mainTableView setDataSource:self];
[mainTableView setDelegate:self];
[self.view addSubview:mainTableView];
}
And the rest of my code:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return [countries count];
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
return [[countries allKeys] objectAtIndex:section];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
NSString *continent = [self tableView:tableView titleForHeaderInSection:section];
return [[countries valueForKey:continent] count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
// Configure the cell...
NSString *continent = [self tableView:tableView titleForHeaderInSection:indexPath.section];
NSString *country = [[countries valueForKey:continent] objectAtIndex:indexPath.row];
cell.textLabel.text = country;
cell.accessoryType = UITableViewCellAccessoryNone;
if([self.checkedIndexPath isEqual:indexPath])
{
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
else
{
cell.accessoryType = UITableViewCellAccessoryNone;
}
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *object = [tableView cellForRowAtIndexPath:indexPath];
[object setSelected:NO animated:YES];
NSString *selectedTheme = [[object textLabel] text];
NSDictionary *plistFile = [NSDictionary dictionaryWithObject:selectedTheme forKey:#"CurrentTheme"];
[plistFile writeToFile:#"/Applications/BannerImage.app/CurrentTheme.plist" atomically:YES];
if(self.checkedIndexPath)
{
UITableViewCell* uncheckCell = [tableView
cellForRowAtIndexPath:checkedIndexPath];
uncheckCell.accessoryType = UITableViewCellAccessoryNone;
}
UITableViewCell* cell = [tableView cellForRowAtIndexPath:indexPath];
cell.accessoryType = UITableViewCellAccessoryCheckmark;
self.checkedIndexPath = indexPath;
}
It crashes when I scroll up and try to scroll back down and it crashes when [mainTableView reloadData] is called. How can I fix this?
Crash Log

Answer 1

I found out that I needed to retain the Dictionary because it was being released. So instead of
NSDictionary *countries;
change to this
#property(nonatomic, retain) NSDictionary *countries;
and
#synthesize countries;
in your .mm file and use
self.countries = [NSDictionary dictionaryWithObject:directoryContents forKey:#"Themes"];
instead of
countries = [NSDictionary dictionaryWithObject:directoryContents forKey:#"Themes"];

Answer 2

Hi, Please check there if is any data in countries and "continent" value key is presented or not in dic before this line
NSString *country = [[countries valueForKey:continent] objectAtIndex:indexPath.row];