Question

I have some NSMutableArray in tableView which contain class Lesson

@interface Lesson : NSObject <NSCoding>{

    NSString *time1;
    NSString *time2;
    NSString *predmet;
    NSString *namPrepod;
    NSString *zamet;
}

I move row in tableview………………………………………………………………………………………………………………..

- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath 
{
    if(segmentedControl.selectedSegmentIndex==0)
    {
    if(fromIndexPath.section==0)
    {
       NSMutableArray *r = [[Singleton sharedInstance].chetNedel.monday objectAtIndex:fromIndexPath.row]; 
       [[Singleton sharedInstance].chetNedel.monday  removeObjectAtIndex:fromIndexPath.row];
       [[Singleton sharedInstance].chetNedel.monday  insertObject:r atIndex:toIndexPath.row];
    }
    if(fromIndexPath.section==1)
    {
        NSMutableArray *r = [[Singleton sharedInstance].chetNedel.tuesday objectAtIndex:fromIndexPath.row]; 
        [[Singleton sharedInstance].chetNedel.monday  removeObjectAtIndex:fromIndexPath.row];
        [[Singleton sharedInstance].chetNedel.monday  insertObject:r atIndex:toIndexPath.row];
    }

but when I move row in program I have got error on this lines

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
      ..........
if(segmentedControl.selectedSegmentIndex==0)
    {
        time1 = [[[UILabel alloc] init] autorelease];
        time1.font = [UIFont fontWithName:@"Arial-BoldMT" size:13];
        time1.tag = tagtime1;
        time1.backgroundColor = [UIColor clearColor];
        if(indexPath.section ==0)
            time1.text =[(Lesson *) [[Singleton sharedInstance].chetNedel.monday objectAtIndex:indexPath.row] time1];
        if(indexPath.section ==1)
            time1.text =[(Lesson *) [[Singleton sharedInstance].chetNedel.tuesday objectAtIndex:indexPath.row] time1];
        if(indexPath.section ==2)
            time1.text =[(Lesson *) [[Singleton sharedInstance].chetNedel.wednesday objectAtIndex:indexPath.row] time1];
        if(indexPath.section ==3)
            time1.text =[(Lesson *) [[Singleton sharedInstance].chetNedel.thirsday objectAtIndex:indexPath.row] time1];
        if(indexPath.section ==4)
            time1.text =[(Lesson *) [[Singleton sharedInstance].chetNedel.friday objectAtIndex:indexPath.row] time1];
        if(indexPath.section ==5)
            time1.text =[(Lesson *) [[Singleton sharedInstance].chetNedel.saturday objectAtIndex:indexPath.row] time1];
        time1.frame = CGRectMake(8, 12, 300-124, 11);
     ...........
 [cell.contentView addSubview:time1];

what i do wrong?

Answer 1

What error are you getting exactly? Looking at your code however I think the problem happens when you do the removeObjectAtIndex followed by insertObject:atIndex:. After you remove the object, the indexes of the array are recalculated and now you have 1 less object in your array. So if you then do the insertObject:atIndex without decreasing the index where you want to put it, you’re not going to end up with it where you want. I suggest you combine both lines into one and use exchangeObjectAtIndex:withObjectAtIndex: instead. Here’s updated code:

    if(fromIndexPath.section==0)
{
   [[Singleton sharedInstance].chetNedel.monday exchangeObjectAtIndex:fromIndexPath.row withObjectAtIndex:toIndexPath.row];
}
if(fromIndexPath.section==1)
{
    [[Singleton sharedInstance].chetNedel.tuesday exchangeObjectAtIndex:fromIndexPath.row withObjectAtIndex:toIndexPath.row];
}