saving checkmark accessory value in nsuserdefaults and then retreving them - iphone

Question

hi
i am trying to save state of ticked row in nsuserdefaults.Some how i am getting error
:setObject undeclared.
my code is as:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *newCell = [tableView cellForRowAtIndexPath:indexPath];
NSInteger newRow = [indexPath row];
NSInteger oldRow = (lastIndexPath != nil) ? [lastIndexPath row] : -1;
if(newRow != oldRow)
{
newCell.accessoryType = UITableViewCellAccessoryCheckmark;
UITableViewCell *oldCell = [tableView cellForRowAtIndexPath:lastIndexPath];
oldCell.accessoryType = UITableViewCellAccessoryNone;
lastIndexPath = indexPath;
}
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
prefs = [setObject:lastIndexPath forKey:#"lastIndexPath"];
}
also i am trying to fetch row state in viewdidload method(should i fetch here?in view did load).my code is as:
- (void)viewDidLoad {
menuList=[[NSMutableArray alloc] initWithObjects:
[NSArray arrayWithObjects:#"LOCATION1",nil],
[NSArray arrayWithObjects:#"LOCATION2",nil],
[NSArray arrayWithObjects:#"LOCATION3",nil],
[NSArray arrayWithObjects:#"LOCATION4",nil],
[NSArray arrayWithObjects:#"LOCATION5",nil],
[NSArray arrayWithObjects:#"LOCATION6",nil],
[NSArray arrayWithObjects:#"LOCATION7",nil],
nil];
[self.navigationController setNavigationBarHidden:NO];
self.navigationController.navigationBar.tintColor=[UIColor blackColor];
self.navigationController.navigationBar.barStyle=UIBarStyleBlackTranslucent;
self.title=#"Location Selection";
[table reloadData];
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
if([[prefs objectForKey:#"lastIndexPath"] compare: indexPath]== NSOrderedSame){
cell.AccessoryType = UITableViewCellAccessoryCheckMark;
}
[super viewDidLoad];
}
and getting errors: indexPath Undeclared and cell undeclared.
i am getting why these errors are coming coz both of them(indexpath and cell) are not in scope,then where to place this code(nsuserdefaults data retriving code).Please guide my.
Thanks!

Answer 1

Try replacing this:
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
prefs = [setObject:lastIndexPath forKey:#"lastIndexPath"];
With this:
[[NSUserDefaults standardUserDefaults] setObject:lastIndexPath forKey:#"lastIndexPath"];
Your error is because you are invoking setObject:forKey: without specifying that your prefs object is calling it. So the compilor is not identifying it as a valid message. You are also trying to assing that messages output to your prefs object, which is not correct.
This said, I am pretty sure you cant store an NSIndexPath inside of a plist directly, you would either have to store as an NSNumber, NSString, or NSData.
This would look like this:
[[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithInt:lastIndexPath.row] forKey:#"lastIndexPath"];