Attempt to create two animations for cell - ios

Question

I would like to create cell by expand and collapse. To do this i animate the cell by reloading. When i expand it works fine. But when i collapse it crashes and the reason is Attempt to create two animations for cell. I know Ive given same array paths and it wont reload two cell at the time. Is there a way to fix this.
I am new to coding, so i would be happy to get a simple solution.
Code:
The reason am using lastSelIPath is when first cell is expanded and touch the second cell the first cell would collapse and the second cell would expand.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSIndexPath* lastSelIPath = [ NSIndexPath indexPathForRow:selectedIndex_ inSection:0 ];
[ tableView deselectRowAtIndexPath:indexPath animated:YES ];
if (selectedIndex_ == indexPath.row)
{
selectedIndex_ = -1;
}
else
{
selectedIndex_ = indexPath.row;
}
NSIndexPath* ipath = [ NSIndexPath indexPathForRow:indexPath.row inSection:0 ];
NSArray* indexPathArr = [ NSArray arrayWithObjects:lastSelIPath, ipath, nil ];
[ tableView beginUpdates ];
[ tableView reloadRowsAtIndexPaths:indexPathArr withRowAnimation:UITableViewRowAnimationAutomatic ];
[ tableView endUpdates ];
}
So what i did now I set a condition and reload the one i wanted. Is it a correct method to follow please help.
Modified code:
if ( lastSelIPath.row == ipath.row )
{
[tableView reloadRowsAtIndexPaths:#[ipath] withRowAnimation:UITableViewRowAnimationAutomatic];
}
else
{
[tableView reloadRowsAtIndexPaths:#[lastSelIPath] withRowAnimation:UITableViewRowAnimationAutomatic];
[tableView reloadRowsAtIndexPaths:#[ipath] withRowAnimation:UITableViewRowAnimationAutomatic];
}

Answer 1

Crash is right, you are trying to attempt two animation. Your indexPathArr contains two objects. Do not create this array and try this:
[tableView reloadRowsAtIndexPaths:#[lastSelIPath] withRowAnimation:UITableViewRowAnimationAutomatic];
[tableView reloadRowsAtIndexPaths:#[ipath] withRowAnimation:UITableViewRowAnimationAutomatic];
Let me know, if it helps

Answer 2

[tableView reloadRowsAtIndexPaths:#[newIndexPath, oldIndexPath] withRowAnimation:UITableViewRowAnimationNone];
If newIndexPath is same as oldIndexPath, it will crash in iOS8, but this is fixed in iOS9 and later.

Answer 3

You can use third party library for expanding cell.
https://github.com/bennyguitar/CollapseClick
& implement there delegate method as
-(int)numberOfCellsForCollapseClick
{
}
-(NSString *)titleForCollapseClickAtIndex:(int)index {
}
-(UIView *)viewForCollapseClickContentViewAtIndex:(int)index {
}

Answer 4

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if (selectedTag==1) {
selectedIndex=indexPath.row;
[self performSelector:#selector(Write Your Action) withObject:nil];
}
NSMutableArray *modifiedRows = [NSMutableArray array];
if ([indexPath isEqual:self.expandedIndexPath]) {
[modifiedRows addObject:self.expandedIndexPath];
self.expandedIndexPath = nil;
}
else {
if (self.expandedIndexPath)
[modifiedRows addObject:self.expandedIndexPath];
self.expandedIndexPath = indexPath;
[modifiedRows addObject:indexPath];
}
// This will animate updating the row sizes
[tableView reloadRowsAtIndexPaths:modifiedRows withRowAnimation:UITableViewRowAnimationAutomatic];
// Preserve the deselection animation (if desired)
[tableView selectRowAtIndexPath:indexPath animated:NO scrollPosition:UITableViewScrollPositionNone];
[tableView deselectRowAtIndexPath:indexPath animated:YES];
}
Using Selected Tag write the condition of your cell expand action. may be it helps.