Skipping rows when iterating through NSMutableArray in TableView - ios

Question

I got this code in my UITableView
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *identifier = #"Cell2";
GamesInfoTableViewCell *cell = (GamesInfoTableViewCell *)[tableView dequeueReusableCellWithIdentifier:identifier];
GameInfo *gameInfoObject;
gameInfoObject =[LiveGamesArray objectAtIndex:indexPath.row];
if ([gameInfoObject.GameTime isEqual: #"FT"] | ([gameInfoObject.GameTime rangeOfString:#":"].location != NSNotFound)){
--------------> What to do here? <----------------------------
}
cell.backgroundColor = TABLECOLOR;
cell.homeTeamLabel.textColor = TEXT;
cell.awayTeamLabel.textColor = TEXT;
cell.gameTimeLabel.textColor = TEXT;
cell.liveButton.image = [UIImage imageNamed:#"1675447.png"]; //Load the green image
cell.awayTeamLabel.text = gameInfoObject.AwayTeam;
cell.homeTeamLabel.text = gameInfoObject.HomeTeam;
cell.homeTeamScoreLabel.text = gameInfoObject.HomeScore;
cell.awayTeamScoreLabel.text = gameInfoObject.AwayScore;
cell.gameTimeLabel.text = gameInfoObject.GameTime;
// Configure the cell...
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
return cell;
}
So i have a NSMutableArray that contains some objects. And i would only like to populate the table cells with some of the objects. The If statement checks that and if its true then i would like it to go on with the next object/row in the array. I have tried a couple of things but neither did work. Is the only solution to make another NSMutableArray so i can store the ones i want to populate there and then iterate through that one?
Thanks for all the help!!

Answer 1

Yes, you should, you are filtering the array in cellForRowAtIndexPath, which will be called many times. So what I would recommend is to make the array prepared before you load the table.

Answer 2

The key issue that prevents you from coding this up with a conditional inside cellForRowAtIndexPath is that the row from the index path represents a cumulative value of all items that have not been skipped. Hence you need to consider all values in your array in deciding what to print.
Is the only solution to make another NSMutableArray so i can store the ones i want to populate there and then iterate through that one?
This would be a good solution. This is much better than an alternative of traversing the array from the beginning each time, counting the matching objects until you skip row-1 objects, and taking the next one.
Another alternative is building a translation table - i.e. an array of indexes that maps a row to the index in the original NSMutableArray. You can build this table in the method that supplies the row count to your UITableView, and keep it until the next refresh.
Suppose your NSMutableArray looks like this:
0 1 2 3 4 5 6 7 8 9
N Y Y N N Y N Y N N
Top row shows element index. Y is the item you want to keep; N is the item you don't want to show. Your row count method returns 4 (the number of Ys), and builds a table that looks like this:
0 1 2 3
1 2 5 7
The top row is the index of the index array. The bottom row is the index into the original array. Your cellForRowAtIndexPath code needs to pick
gameInfoObject =[LiveGamesArray objectAtIndex:translation[indexPath.row]];
For row 0, translation[indexPath.row] is 1; for row 1, translation is 2; for row 2, translation is 5, and for row 3 it is 7.

Answer 3

as you say "So i have a NSMutableArray that contains some objects. And i would only like to populate the table cells with some of the objects."so there hould be ideally two arrays, 1.LiveGamesArray, 2. create a new filter array like this:
NSMutableArray * filterArray = [NSMutableArray array];
for (GameInfo *gameInfoObject in LiveGamesArray)//can use predicate also
{
#autorelease{
if ([gameInfoObject.GameTime isEqual: #"FT"] || ([gameInfoObject.GameTime rangeOfString:#":"].location != NSNotFound)) {
[filterArray addObject:gameInfoObject];
}
}
}
3.use this filterArray in all data source/ delegate method of your tableview.
hope it will help you.