Adding Strings to An Array

Question

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{

BOOL isChecked; 

//check if there is checkmark there

if([tableView cellForRowAtIndexPath:indexPath].accessoryType == UITableViewCellAccessoryCheckmark){

    isChecked = YES; 

}

else {
    isChecked = NO; 
}

//adds or moves checkmark

if(isChecked == YES){

    NSLog(@"Checkmark removed...");



    UITableViewCell *newCell = [tableView cellForRowAtIndexPath:indexPath];
    newCell.accessoryType = UITableViewCellAccessoryNone; 

    lastIndexPath = indexPath; 

}


if(isChecked == NO){

    NSLog(@"Checkmark added...");

    [chosenSports addObject:[sports objectAtIndex:[indexPath row]]]; 

    NSLog(@"%@",[chosenSports objectAtIndex:0]); 

    UITableViewCell *newCell = [tableView cellForRowAtIndexPath:indexPath]; 
    newCell.accessoryType = UITableViewCellAccessoryCheckmark; 

    lastIndexPath = indexPath; 

}


[tableView deselectRowAtIndexPath:indexPath animated:YES];

}

For some reason the result of my NSLog is NULL, indicating that the "chosenSports" array is empty, but I don't know why! Any suggestions?

If your array was really empty, this would actually crash and not log null. — omz
– omz, Commented Aug 17, 2012 at 23:51
@omz, in Objective C there is no NullPointerException...compiler returns random garbage from memory if the pointer points to null valued address. So it won't crash, it will keep runing — TeaCupApp
– TeaCupApp, Commented Aug 17, 2012 at 23:53
@Owl I know, that's why it's actually not crashing (the array is nil, not empty). But trying to get the first object of an empty array would raise an exception. — omz
– omz, Commented Aug 17, 2012 at 23:59
@omz, My bad, apologies! I didn't understood at first time. Peace! — TeaCupApp
– TeaCupApp, Commented Aug 18, 2012 at 0:00

Stunner · Accepted Answer · 2012-08-17 23:51:09Z

2

Make sure you initialize your array like so (in your viewDidLoad function):

self.chosenSports = [[NSMutableArray alloc] initWith...];

answered Aug 17, 2012 at 23:51

Stunner

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Comments

user836218 · Accepted Answer · 2012-08-18 04:09:09Z

0

Make sure that your array is an instance of NSMutableArray. If that is done correctly, then you know that [sports objectAtIndex:[indexPath row]] is evaluating to zero (nil/NULL). Try querying the array for its count.

answered Aug 18, 2012 at 4:09

user836218

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