Re: Getting started with NSTableView

[Andrew Merenbach]

On Nov 7, 2008, at 8:37 AM, Benjamin Dobson wrote:

Hi all,



// snipped

.m:
@implementation FetchHighscores

- (IBAction)fetchResults:(id)sender
{

        NSArray *components = [results componentsSeparatedByString:@"\n"];

        int loops = [components count];
        int loop;
        for (loop = 0; loop < loops; loop++)
        {
                currentData = [NSMutableArray arrayWithCapacity:4];
                [currentData addObject:@"0"];

                {
                        [currentData addObject:@"0"];
                }

                [finalScores insertObject:dict atIndex:loop];
        }
        [theTable reloadData];
}


// snipped

I'm getting strange errors. In the console, I get:




What needs changing?

Thanks.

I'm trying to use an NSTableView for the first time. I've got a four- column table view set up in IB, and class files for the dataSource as follows: finalData = [NSMutableArray arrayWithCapacity:4]; // To prevent it being (null) NSString *string = @"1,1,1 2,2,2 3,3,3 4,5,6 7,3,4" // etc. Loaded from an external source. NSArray *template = [NSArray arrayWithObjects:@"Col1", @"Col2", @"Col3", @"Col4", nil]; [currentData addObjectsFromArray:[[scores objectAtIndex:loop] componentsSeparatedByString:@","]]; while ([currentData count] < 4) // External source isn't entirely consistent. This is just a placeholder. NSDictionary *dict = [NSDictionary dictionaryWithObjects:currentData forKeys:template]; *** -[NSRectSet objectAtIndex:]: unrecognized selector sent to instance 0x1516c220 But sometimes I get a different error: the NSParameterAssert isn't satisfied.

Greetings, Benjamin,





Be sure to release it somewhere, typically -dealloc.



Cheers,
        Andrew

This one looks fairly easy to solve to me; when you get random errors involving classes that you're not using, it's often a memory problem. In this case, you are not retaining finalData in the -fetchResults: -- so finalData is in fact *still* null, as you're initializing it with a method that returns an autoreleased array. Try this instead: finalData = [[NSMutableArray alloc] initWithCapacity:4]; // To prevent it being (null) Also, if you're using Garbage Collection, this may not hold -- but I suspect from the situation that you aren't.

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