Re: Getting started with NSTableView
Re: Getting started with NSTableView
- Subject: Re: Getting started with NSTableView
- From: Andrew Merenbach <email@hidden>
- Date: Fri, 7 Nov 2008 08:58:05 -0800
On Nov 7, 2008, at 8:37 AM, Benjamin Dobson wrote:
Hi all,
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:
// snipped
.m:
@implementation FetchHighscores
- (IBAction)fetchResults:(id)sender
{
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 *components = [results componentsSeparatedByString:@"\n"];
NSArray *template = [NSArray arrayWithObjects:@"Col1", @"Col2",
@"Col3", @"Col4", nil];
int loops = [components count];
int loop;
for (loop = 0; loop < loops; loop++)
{
currentData = [NSMutableArray arrayWithCapacity:4];
[currentData addObject:@"0"];
[currentData addObjectsFromArray:[[scores objectAtIndex:loop]
componentsSeparatedByString:@","]];
while ([currentData count] < 4) // External source isn't entirely
consistent. This is just a placeholder.
{
[currentData addObject:@"0"];
}
NSDictionary *dict = [NSDictionary
dictionaryWithObjects:currentData forKeys:template];
[finalScores insertObject:dict atIndex:loop];
}
[theTable reloadData];
}
// snipped
I'm getting strange errors. In the console, I get:
*** -[NSRectSet objectAtIndex:]: unrecognized selector sent to
instance 0x1516c220
But sometimes I get a different error: the NSParameterAssert isn't
satisfied.
What needs changing?
Thanks.
Greetings, Benjamin,
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)
Be sure to release it somewhere, typically -dealloc.
Also, if you're using Garbage Collection, this may not hold -- but I
suspect from the situation that you aren't.
Cheers,
Andrew
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