change the content of the datasource for a tableView from a different class

[Martin Batholdy]

Hi,

I have a singleton class that manages a tableView (and provides the datasource).

Now I would like to update this tableView from another class.

Since the class that manages the tableView is a singleton I don't have to 
initiate a new instance of that class.
So I thought there should be no problem to change the content of the datasource 
for the tableView and then update the tableView with [table reloadData]; from a 
different class.

I indeed can change the datasource (a mutable Array) but the reloadData command 
doesn't update the content of the table in the window.

What am I doing wrong?
Why has the [table reloadData]; command in the updateView-method no effect on 
the table when it is evoked from a different class (see updateTest.h)?

I tried to isolate the code from my main project;

This test-project contains three classes:
The one that is connected to the preferences.xib providing the datasource for 
the tableView – tableViewController.h
the tableview_testAppDelegate.h
and a class that tries to change the data datasource and tries to send a 
request to update the tableView – updateTest.h

I have a preference.xib file with a tableView that is connected to the 
preference-object (provides the datasource).


I would be really glad for any help!
I hope someone can understand my problem ... I am still a bloody beginner.




// Here the tableViewController gets invoked - a window with a table appears 
showing the content of an array with two dictionaries (the array is called 
content)

tableview_testAppDelegate.h
————————————————————
#import <Cocoa/Cocoa.h>
#import "tableViewController.h"

@interface tableview_testAppDelegate : NSObject <NSApplicationDelegate> {

        tableViewController *test;      
}


@end


tableview_testAppDelegate.m
————————————————————
#import "tableview_testAppDelegate.h"
#import "tableViewController.h"
#import "updateTest.h"

@implementation tableview_testAppDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {

        test = [tableViewController sharedPrefsWindowController];
        [test showWindow:self];

        updateTest *deleteEntry;
        deleteEntry = [[updateTest alloc] init];
}

@end




// Here the tableViewController gets the an updateView-command – one element of 
the array gets deleted and the tableView gets an update command (with no effect)

updateTest.h
————————————————————

#import <Cocoa/Cocoa.h>
#import "tableViewController.h"

@interface updateTest : NSObject {

        tableViewController *update;
}

@end


updateTest.m
————————————————————

#import "updateTest.h"
#import "tableViewController.h"

@implementation updateTest

- (id) init {

        update = [tableViewController sharedPrefsWindowController];
        [update updateView];
        return self;
}

@end





tableViewController.h
————————————————————
#import <Cocoa/Cocoa.h>

@interface tableViewController : NSWindowController <NSToolbarDelegate> {

        IBOutlet NSTableView *table;
        NSMutableArray *content;        
        
}


@property (assign) IBOutlet NSWindow *window;


+ (tableViewController *)sharedPrefsWindowController;
+ (NSString *)nibName;
- (int)numberOfRowsInTableView:(NSTableView *)tableView;
- (id)tableView:(NSTableView *)tableView
objectValueForTableColumn:(NSTableColumn *)tableColumn
                        row:(int)row;
- (IBAction)tableViewSelected:(id)sender;

- (void)updateView;

@end


tableViewController.m
————————————————————

#import "tableViewController.h"

static tableViewController *_sharedPrefsWindowController = nil;

@implementation tableViewController


+ (tableViewController *)sharedPrefsWindowController
{
        if (!_sharedPrefsWindowController) {
                _sharedPrefsWindowController = [[self alloc] 
initWithWindowNibName:[self nibName]];
        }
        
        return _sharedPrefsWindowController;
}

- (void) dealloc {
        [super dealloc];
}

+ (NSString *)nibName
{
        return @"preferences";
}

-(void)awakeFromNib {

        NSDictionary *dict;
    
    dict = [NSDictionary dictionaryWithObjectsAndKeys: @"test",  @"title",  
nil];       
        
        content = [[NSMutableArray alloc] init];
        [content addObject:dict];
        [content addObject:dict];
        
        NSLog(@"content %@", content);
}       
        

- (int)numberOfRowsInTableView:(NSTableView *)tableView
{
        return [content count];
}

- (id)tableView:(NSTableView *)tableView 
objectValueForTableColumn:(NSTableColumn *)tableColumn row:(int)row
{
        return [[content objectAtIndex:row] valueForKey:@"title"];
}

- (IBAction)tableViewSelected:(id)sender
{
        char row;
    row = [sender selectedRow];
        NSIndexSet * selected;
        selected = [[NSIndexSet alloc] init];
        selected = [sender selectedRowIndexes];
}

- (void)updateView {
        
        [content removeObjectAtIndex:0];
        [table reloadData];     
        
        NSLog(@"updated content %@", content);

}

@end



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