Hi guys.

I have an NSMutableArray object(retained, synthesized as all) that is initiated just fine and I can easily add objects to it using the 'addObject:' method. But if I want to replace an object at a certain index with a new one in that NSMutableArray, it doesn't work.

For example:

ClassA.h

@interface ClassA : NSObject {

NSMutableArray *list;

}

@property (nonatomic, copy, readwrite) NSMutableArray *list;

end

ClassA.m

import "ClassA.h"

@implementation ClassA

@synthesize list;

• (id)init

{

[super init];

NSMutableArray *localList = [[NSMutableArray alloc] init];

self.list = localList;

[localList release];

//Add initial data

[list addObject:@"Hello "];

[list addObject:@"World"];

}

// Custom set accessor to ensure the new list is mutable

• (void)setList:(NSMutableArray *)newList

{

if (list != newList) 

{

    [list release];

    list = [newList mutableCopy];

}

}

-(void)updateTitle:(NSString *)newTitle:(NSString *)theIndex

{

int i = [theIndex intValue]-1;

[self.list replaceObjectAtIndex:i withObject:newTitle];

    NSLog((NSString *)[self.list objectAtIndex:i]);  // gives the correct output

}

However, the change remains true only inside the method. from any other method, the

NSLog((NSString *)[self.list objectAtIndex:i]);

gives the same old value.

How can I actually get the old object replaced with the new one at a specific index so that the change can be noticed from within any other method as well.

I even modified the method like this, but the result is the same:

-(void)updateTitle:(NSString *)newTitle:(NSString *)theIndex

{

int i = [theIndex intValue]-1;


NSMutableArray *localList = [[NSMutableArray alloc] init];

localList = [localList mutableCopy];

for(int j = 0; j < [list count]; j++)

{

    if(j == i)

    {

        [localList addObject:newTitle];

        NSLog(@"j == 1");

        NSLog([NSString stringWithFormat:@"%d", j]);

    }

    else

    {

        [localList addObject:(NSString *)[self.list objectAtIndex:j]];

    }

}

[self.list release];

//self.list = [localList mutableCopy];
[self setList:localList];

[localList release];

}

Please help out guys :)