removeobject from nsmutablearray

Question

I m doing a quiz application in which I have stored the correctanswer and its question Id in a NSMutableArray.I m displaying it in a section tableView.Now if I mark another answer in the same section then the prevoius have to be removed and this one has to be attached to the array. But Im unable to get it .

 NSMutableArray *cellSection = [self.finalarray objectAtIndex:indexPath.section];
    int n=[cellSection count];
    NSString *questionId=[[cellSection objectAtIndex:n-1]objectForKey:@"QId"];
 for (NSDictionary *dict in selectedOptionandQIdArray) {

        NSString *str=[dict valueForKey:@"QId"];

        [arr1 addObject:str];

    }

    BOOL isTheObjectThere = [arr1 containsObject:questionId];


    if(isTheObjectThere==YES)
    {
         //remove the prevoius answer and replace by the new answer for the same question id 
    }
 [selectedOptionsArray addObject:dictionary1];


    NSDictionary *dictinary2 =[[NSDictionary alloc] initWithObjectsAndKeys:questionId, @"QId",  nil];
    [selectedOptionsArray addObject:dictinary2];

    [selectedOptionandQIdArray addObject:selectedOptionsArray];

But isTheObjectThere is always 'NO' eventhough there is same question Id.

How can I remove prevoius one and replace by the new one

what values in arr1, NSLog it?

Rajneesh071
– Rajneesh071

2013-02-12 08:42:38 +00:00
Commented Feb 12, 2013 at 8:42 — Rajneesh071
– Rajneesh071, Commented Feb 12, 2013 at 8:42

Vishal · Accepted Answer · 2013-02-12 07:21:08Z

1

id object = [[array objectAtIndex:0] retain];
[array removeObjectAtIndex:0];
[array insertObject:object atIndex:2];

Use these lines.

answered Feb 12, 2013 at 7:21

Vishal

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4 Comments

Vishal Over a year ago

Here id has no data type so we use this for removing & adding at new index in array...

Honey Over a year ago

But I dont know the index of that Question Id.How can I find it and the compare.?

Honey Over a year ago

First I have to check whether the same questionId exists or not .If exists then replace

Vishal Over a year ago

Ok see this link may it helps you in your work: stackoverflow.com/questions/10457527/…

Ravindra Bagale · Accepted Answer · 2013-02-12 07:33:20Z

0

use replaceObjectAtIndex:withObject:. just replace your answer.like this

[selectedOptionsArray replaceObjectAtIndex:indexofrepacingElement withObject:@"newAnswer"];

answered Feb 12, 2013 at 7:33

Ravindra Bagale

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