How to set an image in table cell permanently after reload?

Question

I have a test for whether a cell was clicked by the user. If it was clicked, the image changes. I want that image to remain checked, even if the user clicks it again or the app reloads.

It's really close to working. Right now, the image changes from the grey version to the green version when the cell was selected. The problem is the grey image shows back up when the user clicks the cell again. What do I need to do to fix this?

 //begin checking for selected row and add checkmark
- (NSString *)getKeyForIndex:(int)index
{
    return [NSString stringWithFormat:@"KEY%d",index];
}

- (BOOL) getCheckedForIndex:(int)index
{
    if([[[NSUserDefaults standardUserDefaults] valueForKey:[self getKeyForIndex:index]] boolValue]==YES)
    {
        return YES;
    }
    else
    {
        return NO;
    }
}



- (void) checkedCellAtIndex:(int)index
{
    BOOL boolChecked = [self getCheckedForIndex:index];

    [[NSUserDefaults standardUserDefaults] setValue:[NSNumber numberWithBool:!boolChecked] forKey:[self getKeyForIndex:index]];
    [[NSUserDefaults standardUserDefaults] synchronize];
}


// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [tableList count];
}


// Customize the content and the look of table view cells.
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    static NSString *CellIdentifier = @"Cell";
    UIImage *greyck =[UIImage imageNamed:@"greycheck-sd.png"];
    UIImage *greenck =[UIImage imageNamed:@"greencheck-sd.png"];

    //step 1 check to see if we can reuse a cell that has just rolled off the screen
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath: indexPath];

    //step 2: if there are no cells to be reused, create a new cell
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"];
    }

    //step 3: set the text in the cell using items from the array
    cell.textLabel.text  = [tableList objectAtIndex:indexPath.row];

    //set custom font
    cell.textLabel.font = [UIFont fontWithName:@"Chalkboard SE" size:18.0f];


    //check for previously viewed then set the image
    if([self getCheckedForIndex:indexPath.row]==YES)
    {
        //sets green checkmark after user clicks
        cell.imageView.image = greenck;
    }
    else
    {
        cell.imageView.image = greyck;
    }

    return cell;
}



- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    UIImage *greyck =[UIImage imageNamed:@"greycheck-sd.png"];
    UIImage *greenck =[UIImage imageNamed:@"greencheck-sd.png"];

    NSString *str= [tableList objectAtIndex:indexPath.row];
    if ([str isEqual:@"introduction"])
    {
        NSBundle *bundle = [NSBundle mainBundle];
        NSString *moviePath = [bundle pathForResource:@"Step1-Intro" ofType:@"mp4"];
        NSURL *movieURL = [NSURL fileURLWithPath:moviePath];

        MPMoviePlayerController *theMovie = [[MPMoviePlayerController alloc] initWithContentURL:movieURL];
        theMovie.scalingMode = MPMovieScalingModeAspectFill;
        [theMovie play];
        MPMoviePlayerViewController *moviePlayer = [[MPMoviePlayerViewController alloc] initWithContentURL:movieURL];
        [self presentMoviePlayerViewControllerAnimated:moviePlayer];

    }

    else if ([str isEqual:@"skating"])
    {
        NSBundle *bundle = [NSBundle mainBundle];
        NSString *moviePath = [bundle pathForResource:@"Step2-Skating" ofType:@"mp4"];
        NSURL *movieURL = [NSURL fileURLWithPath:moviePath];

        MPMoviePlayerController *theMovie = [[MPMoviePlayerController alloc] initWithContentURL:movieURL];
        theMovie.scalingMode = MPMovieScalingModeAspectFill;
        [theMovie play];
        MPMoviePlayerViewController *moviePlayer = [[MPMoviePlayerViewController alloc] initWithContentURL:movieURL];
        [self presentMoviePlayerViewControllerAnimated:moviePlayer];
    }




    [tableView deselectRowAtIndexPath:indexPath animated:NO];

    //Use checkedCellAtIndex for check or uncheck cell
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];

    [self checkedCellAtIndex:indexPath.row];

    if([self getCheckedForIndex:indexPath.row]==YES)
    {
        cell.imageView.image = greenck;
    }
    else
    {
        cell.imageView.image = greyck;
    }

}


- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

Answer 1

You do set the displayed image to green at 2 places with

   if([self getCheckedForIndex:indexPath.row]==YES)
    {
        cell.imageView.image = greenck;
    }

But getCheckedForIndex: returns YES

if([[[NSUserDefaults standardUserDefaults] valueForKey:[self getKeyForIndex:index]] boolValue]==YES)  

So far, so good. But it seems to me that you never update your user defaults. If so, you always would return the same value, and nothing will change.