How do i close instance of NSWindowController - objective-c

Question

I'm learning some obj-c and therefore i'm building a small cocoa application.
From the MainMenu.xib i have added a menu to the "Main menu" in the top. When click, this triggers a IBAction that opens an instance of a window, in this case a window for managing categories.
This category window has a NSWindowController, looks like this:
// CategoriesWindow.h
#import <Cocoa/Cocoa.h>
#interface CategoriesWindow : NSWindowController
-(IBAction)OpenCategoriesWindow:(id)sender;
#end
// CategoriesWindow.m
#import "CategoriesWindow.h"
#implementation CategoriesWindow
-(IBAction)OpenCategoriesWindow:(id)sender
{
CategoriesWindow *Categories = [[CategoriesWindow alloc] initWithWindowNibName:#"CategoriesWindow"];
[Categories showWindow:self];
}
#end
To this i have a CategoriesWindow.xib with a NSTableView that does some things, so there for i have a CategoryTableController.h and .m that handles the data for this table.
When i hit a button i want it to do a bunch of things, and then i want the window to close it self. That is, i want this window to close itself from a IBAction in the CategoryTableController.m.
How do I do this? One bad thing with this setup (followed from a tutorial somewhere...) is that I can open a lots of instances of this window by clicking the menu-button.
Any tips or ideas where to begin?

Answer 1

From there Reference:
[Categories close];
However there is something wrong with your implementation as you are creating an instance of the class from an instance method of the class. That doesn't look right to me. Also you aren't retaining the new instance anywhere, so it will be possibly destroyed under ARC or leaked under MRR.
I think you might want:
-(IBAction)OpenCategoriesWindow:(id)sender
{
[self showWindow:sender];
}
-(IBAction)CloseCategoriesWindow:(id)sender
{
[self close];
}
Although I can't be sure.