Question

I have 3 segmented controls in each cell of a tableview on an iPad. The orientation is always landscape for the app and the number of cells vary for each run on the app. The app performs fine if the number of rows are around less than 10, but anywhere above that, the glitches start to appear.

For the kind of application I’m building, I could have as many as 70 rows ==> meaning, 210 UISegmentedControls, all alloced in the memory at once.

Is there a work around? Is there a way I can reuse these UISegmentedControls? If yes, how can I preserve the state of the segmented control?

Otherwise, can anybody propose a new solution? (Each segmented control has items ‘A’ and ‘B’ and there are three segmented controls representing three different parameters for each object corresponding to each row of the table).

UPDATE:

Here’s the code:

- (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] autorelease];
    }

    // Configure the cell...
    segmentedControl1 = (UISegmentedControl*)[array1 objectAtIndex:[indexPath row]];
    segmentedControl1.frame = CGRectMake(180, 15, 100, 30);
    [cell.contentView addSubview:segmentedControl1];

    segmentedControl2 = (UISegmentedControl*)[array2 objectAtIndex:[indexPath row]];
    segmentedControl2.frame = CGRectMake(450, 15, 100, 30);
    [cell.contentView addSubview:segmentedControl2];

    segmentedControl3 = (UISegmentedControl*)[array3 objectAtIndex:[indexPath row]];
    segmentedControl3.frame = CGRectMake(725, 15, 100, 30);
    [cell.contentView addSubview:segmentedControl3];

    cell.selectionStyle = UITableViewCellSelectionStyleNone;

    return cell;
}

Answer 1

Create a custom UITableViewCell subclass. Have three properties in it for your three UISegmentedControls and add them in the init method:

@interfate MyCell : UITableViewCell
@property (nonatomic, retain, readonly) UISegmentedControl *control1;
@property (nonatomic, retain, readonly) UISegmentedControl *control2;
@property (nonatomic, retain, readonly) UISegmentedControl *control3;
@end

@implementation

@synthesize control1 = _control1;
@synthesize control2 = _control2;
@synthesize control3 = _control2;

- (id)init
{
if ((self = [super init]))
{
    _control1 = [[UISegmentedControl alloc] init...];
    _control1.frame = CGRectMake(...);
    [self addSubView:_control1];

    // repeat with control2 & control3
}
//...
@end

Then, rather than storing arrays of UISegmentedControls you can then have arrays of NSNumber holding the selected index.

You’d then do something like:

cell.control1.selectedIndex = [[array1 objectAtIndex:indexPath.row] integerValue];

You could also create custom objects to hold this data and store them in one array.