Expand and collapse the tableview row - ios

Question

I am developing an iOS application. I have one expandable and collapsed tableview. On click the cell of tableview, the tableview cell expands properly but when I click on a second cell I want first cell to collapse and the second to expand. This would leave only one cell expanded at a time.
I am using class HVTableview:-
Code:-
-(void)tableView:(UITableView *)tableView expandCell: (UITableViewCell*)cell withIndexPath:(NSIndexPath*) indexPath;
{
UILabel *detail = (UILabel *)[cell viewWithTag:3];
UIButton *button = (UIButton *)[cell viewWithTag:10];
button.alpha = 0;
button.hidden = NO;
[UIView animateWithDuration:.5 animations:^{
detail.text = #"This is Expand.";
button.alpha = 1;
[cell.contentView viewWithTag:7].transform = CGAffineTransformMakeRotation(3.14);
}];
}
-(void)tableView:(UITableView *)tableView collapseCell: (UITableViewCell*)cell withIndexPath:(NSIndexPath*) indexPath;
{
UILabel *detail = (UILabel *)[cell viewWithTag:3];
UIButton *button = (UIButton *)[cell viewWithTag:10];
button.alpha = 0;
[UIView animateWithDuration:.5 animations:^{
detail.text = #"This is Collapse.";
button.alpha = 0;
[cell.contentView viewWithTag:7].transform = CGAffineTransformMakeRotation(-3.14);
} completion:^(BOOL finished) {
button.hidden = YES;
}];
}
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [_cites count];
}
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath isExpanded: (BOOL)isExpanded;
{
if (isExpanded) {
return 150;
}else
{
return 100;
}
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath isExpanded:(BOOL)isExpanded;
{
static NSString *CellIdentifier = #"cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
UILabel *title = (UILabel *)[cell viewWithTag:2];
UILabel *detail = (UILabel *)[cell viewWithTag:3];
UIImageView *image = (UIImageView *)[cell viewWithTag:1];
UIButton *button = (UIButton *)[cell viewWithTag:10];
[button addTarget:self action:#selector(goToTop) forControlEvents:UIControlEventTouchUpInside];
title.text = [_cites objectAtIndex:indexPath.row % 9];
NSString* bundlePath = [[NSBundle mainBundle] bundlePath];
NSString* imageFileName = [NSString stringWithFormat:#"%d.jpg", indexPath.row % 9 + 1];
image.image = [[UIImage alloc] initWithContentsOfFile:[NSString stringWithFormat:#"%#/%#", bundlePath, imageFileName]];
if (indexPath.row %2 ==1)
cell.backgroundColor = [UIColor colorWithRed:.9 green:.9 blue:.9 alpha:1];
else
cell.backgroundColor = [UIColor colorWithRed:.8 green:.8 blue:.8 alpha:1];
if (!isExpanded)
{
detail.text = #"This is collapse";
[cell.contentView viewWithTag:7].transform = CGAffineTransformMakeRotation(0);
button.hidden = YES;
}
else
{
detail.text = #"This is Expand";
[cell.contentView viewWithTag:7].transform = CGAffineTransformMakeRotation(3.14);
button.hidden = NO;
}
return cell;
}

Answer 1

- (void) collapseExpandButtonTap:(id) sender
{
UIButton* aButton = (UIButton*)sender; //It's actually a button
NSIndexPath* aPath = [self indexPathForCellWithButtonTag:aButton.tag]; //Let's assume that you have only one section and button tags directly correspond to rows of your cells.
//expandedCells is a mutable set declared in your interface section or private class extensiont
if ([expandedCells containsObject:aPath])
{
[expandedCells removeObject:aPath];
}
else
{
[expandedCells addObject:aPath];
}
[myTableView beginEditing];
[myTableView endEditing]; //Yeah, that old trick to animate cell expand/collapse
}
In UITableViewDelegate method:
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
if ([expandedCells containsObject:indexPath])
{
return kExpandedCellHeight; //It's not necessary a constant, though
}
else
{
return kNormalCellHeigh; //Again not necessary a constant
}
}
Key thing here is to determine if your cell should be expanded/collapsed and return right height in delegate method. So accordingly design your requirements.