How do I use a subclass of NSDocumentController in XCode 4?

Question

I am currently in the process of trying to teach myself Cocoa development. Toward this end, I purchased a mostly-excellent book, Cocoa Recipes for Mac OS X: Vermont Reci

Answer 1

The answer marked correct (@Bavarious'answer) fails to work on document-based apps because documents often load before any applicationWillFinishLaunching: is called. After reading the helpful clues in @Graham Perks answer, I tried a few different approaches and this seems to work reliably:

@implementation AppDelegate

- (id)init
{
    self = [super init];
    if (self) {
        MyDocumentController *dc = [[MyDocumentController alloc] init];
        if (dc) {};
    }
    return self;
}

Note Obviously (if not already created) you'll need to create an AppDelegate yourself first and link it in your MainMenu.XIB.