tableview在xcode 4.2中重新加载

Question

我曾在一个应用程序上工作过。我以编程方式添加了表视图。这个应用程序在低于4.2的任何xcode中正常工作，但当我尝试在xcode 4.2发布版本上运行它时，它会在表视图重新加载时出现问题。如何修复错误。请给我一些解决方案来解决xcode 4.2中的错误。

-(void)viewDidAppear:(BOOL)animated{
    DebugLog(@"start");
    [self.tableView reloadData];

    execountarray=[[NSMutableArray alloc]init];
    for(int k=0;k<[mSubUnitsArray count];k++)
    {
        SubUnit *subUnit = (SubUnit*)[mSubUnitsArray objectAtIndex:k];
        NSArray *subUnitExercises = [subUnit.subUnitExercise allObjects];
        [execountarray addObject:[NSString stringWithFormat:@"%d",[subUnitExercises count]]];
    }

    ///////////////
    if (managedObjectContext){

        NSFetchRequest *request = [[NSFetchRequest alloc] init];
        NSEntityDescription *entity = [NSEntityDescription entityForName:@"TSubUnitExerciseProgress" inManagedObjectContext:managedObjectContext];
        [request setEntity:entity];

        // Order the events by creation date, most recent first.
        NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"editDate" ascending:YES];
        NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];
        [request setSortDescriptors:sortDescriptors];
        [sortDescriptor release];
        [sortDescriptors release];

        // Execute the fetch -- create a mutable copy of the result.
        NSError *error = nil;
        NSMutableArray *mutableFetchResults = [[managedObjectContext executeFetchRequest:request error:&error] mutableCopy];
        if (mutableFetchResults == nil) {
            // Handle the error.
            myNotes = nil;
            [myNotes removeAllObjects]; 
        }
        else
        {
            [myNotes setArray: mutableFetchResults];
        }



        //NSLog(@"My notes count:--------unitviewcontroller--------------->%d",[myNotes count]);
        if([myNotes count] ==0)
        {
        setExer1Done:NO;
        setExer2Done:NO;
        }
        else 
        {
            NSLog(@"hey :P");

        }

    }
    [self.tableView reloadData];  

}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    //DebugLog(@"-start- \n");

    CGFloat height = 0.0;

    SubUnit *subUnit = (SubUnit*)[mSubUnitsArray objectAtIndex:indexPath.row];
    NSArray *subUnitExercises = [self sortArray:[subUnit.subUnitExercise allObjects]];



    NSLog(@"mSelectedSubUnitIndex:%d",mSelectedSubUnitIndex.row);
    NSLog(@"subUnitExercises:%d",[subUnitExercises count]);


    if (indexPath.row==mSelectedSubUnitIndex.row && [subUnitExercises count]>1) {
        height =CELL_EXPAND_HEIGHT ;
    }
    else {
        height = CELL_NORMAL_HEIGHT;
    }


    return height;
}

它在NSLog崩溃（@“mSelectedSubUnitIndex：％d”，mSelectedSubUnitIndex.row）;可能是它没有加载索引路径。这里mSelectedSubUnitIndex是索引路径。 非常感谢。