Question

I’m trying to use NSTableView (it’s my first attempt at it) but it’s showing nothing.
I created a project (ARC), i have a tableview in my xib, i dragged the “Data Source” and “Delegate” to my AppDelegate Object.
I have the following code on AppDelegate.h :

#import <Cocoa/Cocoa.h>

@interface AppDelegate : NSObject <NSApplicationDelegate, NSTableViewDelegate, NSTableViewDataSource>{
    NSMutableArray* array;
}

@property (assign) IBOutlet NSWindow *window;
@property (assign) IBOutlet NSTableView *tableView;

@end

And .m :

#import "AppDelegate.h"

@implementation AppDelegate

@synthesize window = _window;
@synthesize tableView = _tableView;

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    [array addObject:@"1"];
    [array addObject:@"2"];
    [array addObject:@"3"];
    [array addObject:@"4"];
    [_tableView reloadData];
}

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

- (NSInteger)numberOfRowsInTableView:(NSTableView *)aTableView{
    return [array count];  
}

@end

What could be the error? Thank you

Answer 1

Assuming the code you’ve posted is complete, the problem seems to be that you never initialize the array instance variable. Add the following line to the top of -applicationDidFinishLaunching::

array = [NSMutableArray array];