iphone - UITableView 滚动时崩溃并且 [reloadData]

Question

我正在使用 theos (越狱)创建一个应用程序，并且我在 RootViewController.mm 文件的 loadView 方法中创建了一个 UITableView:

- (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];
}

我的其余代码:

- (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;
}

当我向上滚动并尝试向下滚动时，它会崩溃，并且当调用 [mainTableView reloadData] 时，它会崩溃。我怎样才能解决这个问题？ Crash Log

Answer 1

我发现我需要保留词典，因为它正在发布。所以而不是

NSDictionary *countries;

改成这个

@property(nonatomic, retain) NSDictionary *countries;

和

@synthesize countries;

在您的 .mm 文件中并使用

self.countries = [NSDictionary dictionaryWithObject:directoryContents forKey:@"Themes"];

而不是

countries = [NSDictionary dictionaryWithObject:directoryContents forKey:@"Themes"];