macOS Adding new item to NSTableView

[Samppaa]

Hello I am currently making my first mac app and I would like to know how can I add item to the NSTableview I already made the datasource thing here is the code

TableDataSource.h

//
//  TableDataSource.h
//  Macohjelma
//
//  Created by Samuli Lehtonen on 29.5.2010.
//  Copyright 2010 Test. All rights reserved.
//

#import <Foundation/Foundation.h>


@interface TableDataSource : NSObject {
	
	@private
	NSArray *aBuffer;

}

@end

TableDataSource.m

//
//  TableDataSource.m
//  Macohjelma
//
//  Created by Samuli Lehtonen on 29.5.2010.
//  Copyright 2010 Test. All rights reserved.
//

#import "TableDataSource.h"


@implementation TableDataSource


- (id)     tableView:(NSTableView *) aTableView
objectValueForTableColumn:(NSTableColumn *) aTableColumn
				 row:(int) rowIndex
{  
	return [aBuffer objectAtIndex:rowIndex];  
}


- (int)numberOfRowsInTableView:(NSTableView *)aTableView
{
	return [aBuffer count];
}

@end

And here is the code where I try to add the item,

[Notes setDataSource:DataSource];
[DataSource addItemWithTitle:@"Hello"];
[Notes reloadData];

I was wondering whats wrong as I don't see it there when I try to add, do I have to implement the additemwithtitle method inside my datasource class?

 

[chown33]

Post more code.

You don't show how your variables Notes and DataSource are declared.

You don't show how the aBuffer ivar in an instance of TableDataSource is assigned a value. Unless and until you assign it a value, then that ivar will be nil.

You don't show the definition of any method addItemWithTitle:. Why would you expect it to do anything if you don't define a method that does something?

If you're following a tutorial or a book, tell us exactly what it is. If you're not, you probably should be, because you're missing a whole lot of really important things.

 

[Samppaa]

v

I guess I just download a book and follow it as this is amazingly hard compared what I have done before on windows development. I guess it starts to make sense sometime...

 

[fernandovalente]

Hello I am currently making my first mac app and I would like to know how can I add item to the NSTableview I already made the datasource thing here is the code

TableDataSource.h

//
//  TableDataSource.h
//  Macohjelma
//
//  Created by Samuli Lehtonen on 29.5.2010.
//  Copyright 2010 Test. All rights reserved.
//

#import <Foundation/Foundation.h>


@interface TableDataSource : NSObject {
	
	@private
	NSArray *aBuffer;

}

@end

TableDataSource.m

//
//  TableDataSource.m
//  Macohjelma
//
//  Created by Samuli Lehtonen on 29.5.2010.
//  Copyright 2010 Test. All rights reserved.
//

#import "TableDataSource.h"


@implementation TableDataSource


- (id)     tableView:(NSTableView *) aTableView
objectValueForTableColumn:(NSTableColumn *) aTableColumn
				 row:(int) rowIndex
{  
	return [aBuffer objectAtIndex:rowIndex];  
}


- (int)numberOfRowsInTableView:(NSTableView *)aTableView
{
	return [aBuffer count];
}

@end

And here is the code where I try to add the item,

[Notes setDataSource:DataSource];
[DataSource addItemWithTitle:@"Hello"];
[Notes reloadData];

I was wondering whats wrong as I don't see it there when I try to add, do I have to implement the additemwithtitle method inside my datasource class?

Show us your code. But let me try to understand what you're trying to do.

If DataSource is a NSMutableArray, it's

[DataSource addObject:@"Hello"];

Not

[DataSource addItemWithTitle:@"Hello"];

Also, I think you're trying to set the datasource for the same class you're calling those methods from, so it's:

[Notes setDataSource:self];

Not

[Notes setDataSource:DataSource];

But really, unless you post your entire code, we will not be able to help you

 

[BadWolf13]

It's actually quite simple. I'm assuming that "Notes" is your outlet for the tableView and that "DataSource" is your array. First thing is that fernandovalente is right, addItemWithTitle: is not a valid method for an NSMutableArray, what you're looking for is addItem:. Second, I'm not sure if it's a big deal, but object names should start with a lower case letter, which you did not follow with DataSource and Notes. Your program may not be able to access the setter because of this small difference.

 

[Samppaa]

Can you tell me good book what teaches all these things and gives some exercises... Seems so hard to learn alone

 

[fernandovalente]

Can you tell me good book what teaches all these things and gives some exercises... Seems so hard to learn alone

This is the best one I know:

http://www.amazon.com/Cocoa-Programming-Mac-OS-3rd/dp/0321503619

Also, add me on iChat and I could help you if you have any question

fernandovalente@mac.com

 

[CarlJ]

Indeed, Aaron Hillegass' Cocoa Programming for Mac OS X (as linked in the previous post) has been helpful to legions of Mac programmers; you might also want to take a look at his new iPhone Programming: The Big Nerd Ranch Guide (I've not read it yet).

 

[BadWolf13]

I concur with Aaron Hillegass' book. It's what I am using, and I find it very good. I'm trying to be good and actually read the whole thing before I bug everyone on here with silly questions, but so far I'm not succeeding.