Add UIView subclass to UIViewController subclass programatically

Question

Hi.
I've been trying to find out how to add a UIView subclass to a UIViewController subclass all in code with no IB.
I've googled and searched forums but nothing seems to work for me.
How would you go about making the most simple app that has an appDelegate, view controller, and a view?
I load the view controller (MainViewController) and anchor it to the window in appDelegate.
Then I make a UIView subclass (MainView) and add the class to mainViewController and create an instance of it.
I import the .h and in the loadView method of the viewController I add this:
[self.view addSubview:mainView];
That doesn't seem to work and I have also tried initializing it like so:
CGRect = screenBounds = [[UIScreen mainScreen] applicationFrame];
CGRect = windowBounds = screenBounds;
windowBounds.origin.y = 0.0;
self.view = [[UIWindow alloc] initWithFrame:screenBounds];
mainView = [[MainView alloc] initWithFrame:windowBounds];
[self.view addSubview:mainView];
All this results in absolutely nothing except for the white background of the view controller to show.
Just to see if it works, I initialized the mainView's background to a greenColor;
Any help would be much appreciated as this is the only thing preventing me from completing an app.

Answer 1

Here are the .m files for a project named AllCode. I started it by removing the nib file from the Window-Based Application template:
// main.m - since there's no nib the app delegate class must be specified here
#import <UIKit/UIKit.h>
int main(int argc, char *argv[]) {
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
int retVal = UIApplicationMain(argc, argv, nil, @"AllCodeAppDelegate");
[pool release];
return retVal;
// AllCodeAppDelegate.m
#import "AllCodeAppDelegate.h"
#import "MyViewController.h"
@implementation AllCodeAppDelegate
@synthesize window;
@synthesize myViewController;
- (void)applicationDidFinishLaunching:(UIApplication *)application {
CGRect frame = [[UIScreen mainScreen] applicationFrame];
UIWindow *aWindow = [[UIWindow alloc] initWithFrame:frame];
self.window = aWindow;
[aWindow release];
MyViewController *aViewController = [[MyViewController alloc] init];
self.myViewController = aViewController;
[aViewController release];
[window addSubview:myViewController.view];
[window makeKeyAndVisible];
- (void)dealloc {
[window release];
[myViewController release];
[super dealloc];
@end
// MyViewController.m
#import "MyViewController.h"
#import "MyView.h"
@implementation MyViewController
@synthesize label;
- (void)loadView {
CGRect frame = [[UIScreen mainScreen] bounds];
self.view = [[MyView alloc] initWithFrame:frame];
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor lightGrayColor];
CGRect rect = CGRectMake(100, 210, 120, 21);
UILabel *aLabel = [[UILabel alloc] initWithFrame:rect];
self.label = aLabel;
[aLabel release];
label.text = @"Hello World!";
label.textAlignment = UITextAlignmentCenter;
label.backgroundColor = [UIColor clearColor];
[self.view addSubview:label];
- (void)dealloc {
[label release];
[super dealloc];
@end
Edit Info.plist to remove the Main nib file base name--i.e. just delete the default name to leave that field blank--and you should be good to go.