Collapse / Expand a specific cell in UITableView - ios

Question

I currently have 2 categories (cat, dog) in 1 UITableView.
This is the illustration:
The cat and dog button are part of the UITableView they are in the header section.
they act as a separator for both categories.
what i'm trying to achieve is when i click the cat button, the list under the cat button should collapse and the dog button should re - adjust it's position.
When i click again the cat button, the list should expand.
what i currently have is :
NSUInteger indexes = (unsigned long)filteredList.count;
for (int i = 0 ; i <= indexes - 1 ; i++)
{
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
[self.accountBalanceTableView cellForRowAtIndexPath:indexPath].hidden = YES;
}
It hides all of my cat list but the dog button is not adjusting it's position where it just leaves a huge amount of white space in the screen.

Answer 1

There are two possibilities you can do this.
Change the height of the rows in the section you want to hide.
Return 0 for the rows in the section you want to hide.

Answer 2

you can use two cell(maincell,subcell)in your table and put this code in cell for row at indexpath.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
if (tableView == _tblDispChapters) {
if(indexPath.row == 0){
TVCDispChapters *cell = [tableView dequeueReusableCellWithIdentifier:#"Cell" forIndexPath:indexPath];
//Accuracy
int acu;
if ([[marrParentChapters objectAtIndex:indexPath.section]valueForKey:#"acuracy"]==[NSNull null] ) {
NSLog(#"%#",[[marrParentChapters objectAtIndex:indexPath.section]valueForKey:#"acuracy"]);
acu=0;
}
else
{
acu=[[[marrParentChapters objectAtIndex:indexPath.section]valueForKey:#"acuracy"] intValue];
NSLog(#"%d",acu);
}
cell.lbl_acu.text=[NSString stringWithFormat:#"Accuracy %d%%",acu];
[cell.pro_cell_chapt.layer setCornerRadius:cell.pro_cell_chapt.frame.size.height/2];
cell.pro_cell_chapt.clipsToBounds = true;
[cell.pro_cell_chapt setTransform:CGAffineTransformMakeScale(1.0f, 2.0f)];
cell.pro_cell_chapt.progress = acu/100.0;
cell.pro_cell_chapt.trackTintColor = [UIColor colorWithHex:0xDDDDDD];
cell.pro_cell_chapt.progressTintColor = [UIColor colorWithHex:0xEF9430];
cell.lblChepterName.text = [[marrParentChapters objectAtIndex:indexPath.section]valueForKey:#"ChapterName"];
[cell.btn_sel_allchptr setTag:indexPath.section];
[cell.btn_sel_allchptr addTarget:self action:#selector(checkBoxClicked:)forControlEvents:UIControlEventTouchUpInside];
if ([[_marrHideShowSection objectAtIndex:indexPath.section] boolValue]){
[cell.imgArrow setImage:[UIImage imageNamed:#"up-arrow1"]];
}else{
[cell.imgArrow setImage:[UIImage imageNamed:#"down-arrow1"]];
}
if ([[_marrAllChapter objectAtIndex:indexPath.section] boolValue]){
[cell.img_cpt_select setImage:[UIImage imageNamed:#"checkbox-selected1"]];
}else{
[cell.img_cpt_select setImage:[UIImage imageNamed:#"checkbox-unselected1"]];
}
return cell;
}else{
TVCDispChapters *cell = [tableView dequeueReusableCellWithIdentifier:#"sub_Cell" forIndexPath:indexPath];
cell.lblSubChapterName.text = [[[marrSubChapters objectAtIndex:indexPath.section] objectAtIndex:indexPath.row-1]valueForKey:#"ChapterName"];
if ([[[_marrSelectionSection objectAtIndex:indexPath.section] objectAtIndex:indexPath.row-1] boolValue])
{
[cell.imgSelection setImage:[UIImage imageNamed:#"checkbox-selected1"]];
}else{
[cell.imgSelection setImage:[UIImage imageNamed:#"checkbox-unselected1"]];
}
return cell;
}
}else{
QuestionTypeTVC *cell1 = [tableView dequeueReusableCellWithIdentifier:#"CellQuesType" forIndexPath:indexPath];
if ([_marrSelectedQuestionypeID containsObject:[[_marrQuestiontype objectAtIndex:indexPath.row] valueForKey:#"QuestionTypeID"]]){
cell1.imgSelection.image = [UIImage imageNamed:#"checkbox-selected1"];
}else{
cell1.imgSelection.image = [UIImage imageNamed:#"checkbox-unselected1"];
}
cell1.lblQuesType.text=#"1";
return cell1;
}
}