Reordering a cell error

[scrumsolutions]

Hi All,

I have a problem with an array.

My array contains data for UITableView cells, the problem I have implemented the reordering ability and used the following code;

- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath
      toIndexPath:(NSIndexPath *)toIndexPath {
    
    NSString *item = [[arryData objectAtIndex:fromIndexPath.row] retain];
    [arryData removeObjectAtIndex:fromIndexPath.row];
    [arryData insertObject:item atIndex:toIndexPath.row];
    [item release];
}

In Xcode I have a warning;

'NSArray' may not respond to 'insertObject:atIndex'

against;

   [arryData removeObjectAtIndex:fromIndexPath.row];
   [arryData insertObject:item atIndex:toIndexPath.row];

When I run the debugger I keep hitting the following error;

Thread 1: Program recieved signal: "SIGABRT"

(Am I the only one who finds the Output feedback pointless? Coming from VS, the error output is very generic)

Can you help?

Cheers

Carl

[dljeffery]

NSArray is immutable. Hence the warnings, and also the crash.

You want NSMutableArray for what you are doing.

Tip: if you see a warning like that, check the docs. There you would see that NSArray doesn't respond to insertObject:atIndex:.

[scrumsolutions]

Hi,

I have used the NSMutableArray, but I still get an error. I have included the code for populating the array in case there is an issue with that as well.

My code is;
*.h

NSMutableArray *arryData;

*.m

- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath
      toIndexPath:(NSIndexPath *)toIndexPath {
    
    NSString *item = [[arryData objectAtIndex:fromIndexPath.row] retain];
    [arryData removeObjectAtIndex:fromIndexPath.row];
    [arryData insertObject:item atIndex:toIndexPath.row];
    [item release];
}

- (void)viewDidLoad
{
    arryData = [[NSArray alloc] initWithObjects:@"iPhone",@"iPod",@"MacBook",@"MacBook Pro",nil];
    [super viewDidLoad];
}

[scrumsolutions]

Originally Posted by scrumsolutions

Hi,

I have used the NSMutableArray, but I still get an error. I have included the code for populating the array in case there is an issue with that as well.

My code is;
*.h

NSMutableArray *arryData;

*.m

- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath
      toIndexPath:(NSIndexPath *)toIndexPath {
    
    NSString *item = [[arryData objectAtIndex:fromIndexPath.row] retain];
    [arryData removeObjectAtIndex:fromIndexPath.row];
    [arryData insertObject:item atIndex:toIndexPath.row];
    [item release];
}

- (void)viewDidLoad
{
    arryData = [[NSArray alloc] initWithObjects:@"iPhone",@"iPod",@"MacBook",@"MacBook Pro",nil];
    [super viewDidLoad];
}

Ignore me, I'm being a plank! I forgot to declare [[NSArray alloc], I forgot to change this to NSMutableArray!