Objective-C check if item exists in NSMutableArray

Question

I have this section of code here:

for (int i = 0; i<[taskData count]; i++)
    {
        for (int j=0; j<[allJobTaskArray count]; j++)
        {
            NSLog(@"%d", i);
            NSLog(@"%d", j);
            PunchListDataCell *pldCell = [[[PunchListDataCell alloc]init] autorelease];
            pldCell.stringData= [self reverseStringDate:[[[allJobTaskArray objectAtIndex:j] objectAtIndex:i] substringToIndex:10]];
            pldCell.cellSelected = NO;
            [punchListData addObject:pldCell];
        }

    }

Now let me explain:

taskData count is 57 and is a NSArray
allJobTaskArray count is 12 and is a NSMutableArray
This code will crash at this line: pldCell.stringData= [self reverseStringDate:[[[allJobTaskArray objectAtIndex:j] objectAtIndex:i] substringToIndex:10]]; when j is 6 and i is 36 simple because in allJobTaskArray objectAtIndex: 6 objectAtIndex: 36 does not exist.
This is the error I am getting: [__NSCFArray objectAtIndex:]: index (36) beyond bounds (36)
What I am trying to do is if the item does not exist, then pldCell should equal @"";
- My question is how would I check if I am item exist or not ?

I have tried the following:

if([[allJobTaskArray objectAtIndex:j] objectAtIndex:i] == [NSNull null]){
                pldCell.stringData = @"";
            }else{
                pldCell.stringData= [self reverseStringDate:[[[allJobTaskArray objectAtIndex:j] objectAtIndex:i] substringToIndex:10]];
            }

tpatiern · Accepted Answer · 2015-05-19 03:50:00Z

1

Altogether it should look something like -

for (int i = 0; i<[taskData count]; i++)
    {
        for (int j=0; j<[allJobTaskArray count]; j++)
        {
            NSLog(@"%d", i);
            NSLog(@"%d", j);


            PunchListDataCell *pldCell = [[[PunchListDataCell alloc]init] autorelease];
            if ([[allJobTaskArray objectAtIndex:j] count] > i) {                    
                pldCell.stringData= [self reverseStringDate:[[[allJobTaskArray objectAtIndex:j] objectAtIndex:i] substringToIndex:10]];
            } else {
                pldCell.stringData = @"";
            }

            pldCell.cellSelected = NO;
            [punchListData addObject:pldCell];
        }
    }

edited May 19, 2015 at 3:50

answered May 19, 2015 at 3:33

tpatiern

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4 Comments

user979331 Over a year ago

nope, still crashes, it always goes into the else I added which is pldCell.stringData= [self reverseStringDate:[[[allJobTaskArray objectAtIndex:j] objectAtIndex:i] substringToIndex:10]];

tpatiern Over a year ago

It should actually be >= i, sorry @user979331

tpatiern Over a year ago

Can you update the question with your current code? I updated my answer with the complete loops @user979331

user979331 Over a year ago

Turns out this works...I just had pldCell.stringData= [self reverseStringDate:[[[allJobTaskArray objectAtIndex:j] objectAtIndex:i] substringToIndex:10]]; before the condition.

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