UITableView Cell highlight / retain selected value IOS - objective-c

Question

I have UIView(LeftMenu) with UITableView (UITableViewStylePlain). I have around 7 controllers , Where on selection of each cell I wanna push corresponding controller. I tried custom highlight for cell with yellow color as below ,
UIColor *yel=[[UIColor alloc]initWithRed:240/255.0 green:197/255.0 blue:67/255.0 alpha:1.0];
UIView *bgColorView = [[UIView alloc] init];
[bgColorView setBackgroundColor:yel];
[cell setSelectedBackgroundView:bgColorView];
in cellForRowAtIndexPath. But I am unable to retain selected cell If I move to next controller. In didSelectRowAtIndexPath , I am capturing last selected index ( When I select new cell , old should be unhighlighted). But it seems , If I make custom its not retaining. If I keep UITableViewCellSelectionStyleNone , cell.backgroundColor it works. But not highlighting :(
[[NSUserDefaults standardUserDefaults]setInteger:indexPath.row forKey:#"SSLastSelectedLeftMenuIndex"];
I am initializing UIView(LeftMenu) with frame.
Issue : Gray Color on Highlight after few mins custom yellow highlight coming and Not retaining selected cell color.
I know I am missing some silly thing. But its eating my time. Advance thanks :)
Update:-
below is my -cellForRowAtIndexpath method
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
if([[NSUserDefaults standardUserDefaults]integerForKey:#"SSLastSelectedLeftMenuIndex"]==indexPath.ro‌w)
{
///<HIGHLIGHT CODE>;
}

Answer 1

to select the last selectd cell .. (try)
- (void)viewWillAppear
{
[uper viewWillAppear];
//hear u can set the selected cell
//get indexpath of row
int k = your saved row
NSIndexPAth *path = [NSIndexPath indexPathWithIndex:k];//if u hav single section or u can use other class method
[tableView selectRowAtIndexPath:_selctedIndex animated:NO scrollPosition: UITableViewScrollPositionNone];//hear u are directly setting the last selected cell once view will appear
}
hop this helps u :)
if u are using UITableViewCell then u do something like this,for yellow color for selecting the cell
//in controller do like this
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"cell"];
if(cell == nil)
{
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"cell"];
UIColor *yel=[[UIColor alloc]initWithRed:240/255.0 green:197/255.0 blue:67/255.0 alpha:1.0];
UIView *bgColorView = [[UIView alloc] init];
[bgColorView setBackgroundColor:yel];
[cell setSelectedBackgroundView:bgColorView];
}
return cell;
}
in the subclassed table cell there is one method, to display yellow color for selecting the cell
//in CustomCell.m
//in the custom cell set the color for selected state
//override this method
- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
[super setSelected:selected animated:animated];
// Configure the view for the selected state
if(selected)
{
//same code of urs
UIColor *yel=[[UIColor alloc]initWithRed:240/255.0 green:197/255.0 blue:67/255.0 alpha:1.0];
UIView *bgColorView = [[UIView alloc] initWithFrame:self.bounds];//for entaire cell,set the frame
[bgColorView setBackgroundColor:yel];
[self setSelectedBackgroundView:bgColorView];
}
}

Answer 2

You have misunderstood selection and highlighting a cell you should change your cellForRowAtIndexPath like below to select the previously selected item.
before that Declare a globle variable _selctedIndex of type NSIndexpath to store the last selected cell
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
UIColor *yel=[[UIColor alloc]initWithRed:240/255.0 green:197/255.0 blue:67/255.0 alpha:1.0];
UIView *bgColorView = [[UIView alloc] init];
[bgColorView setBackgroundColor:yel];
[cell setSelectedBackgroundView:bgColorView];
}
if([[NSUserDefaults standardUserDefaults]integerForKey:#"SSLastSelectedLeftMenuIndex"]==indexPath.row)
{
//<HIGHLIGHT CODE>;
_selctedIndex=indexPath; //code Updated
}
return cell;
}
After your tableView has reloaded call the below line of code
[tableView selectRowAtIndexPath:_selctedIndex animated:NO scrollPosition:UITableViewScrollPositionTop];
}
The UITableViewCell class will assign the view you have mentioned to the property selectedBackgroundView instead of the Default blue color view for showing in the background when a cell is selected

Answer 3

I ran into the exact same problem in a project, when tapping on a cell long enough to engage highlight then moving to a scroll the UITableView holds onto the highlighted index somehow so that the next attempt to select uses that previous indexPath.
To resolve I did the following
Add Property to Track Offending indexPath
...
#property (nonatomic,strong) NSIndexPath *cachedPath;
...
Track indexPath with didUnhighlightRowAtIndexPath
- (void)tableView:(UITableView *)tableView didUnhighlightRowAtIndexPath:(NSIndexPath *)indexPath
{
self.cachedPath = indexPath;
}
On Drag reload offending indexPath
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
if (self.cachedPath)
{
[self.tableView reloadRowsAtIndexPaths:#[self.cachedPath] withRowAnimation:UITableViewRowAnimationNone];
}
self.cachedPath = nil;
}
For good measure clear the property on selection
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
self.cachedPath = nil;
}