Question

Hello
I have problem with didFinishLaunching methods. I am really getting confused about what was the problem and that’s why I pasted all my code. The problem was the application didn’t launch, it crashed, and it show me this message in console:

**[Demo1AppDelegate setMapViewController:]: unrecognized selector sent to instance 0x5649a30
2011-05-25 14:17:58.724 Demo1[10630:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[Demo1AppDelegate setMapViewController:]: unrecognized selector sent to instance 0x5649a30'**

I am using this code
In Demo1appDelegate.h file

#import <UIKit/UIKit.h>
#import "MapViewController.h"

@interface Demo1AppDelegate : NSObject <UIApplicationDelegate> {
    UIWindow *window;
    MapViewController *mapViewController;
}

@property (nonatomic, retain) IBOutlet UIWindow *window;

@end

And in
Demo1AppDelegate.m file

#import "Demo1AppDelegate.h"
@interface Demo1AppDelegate ()
@property (nonatomic, retain) MapViewController *mapViewController;
@end

@implementation Demo1AppDelegate

@synthesize window;


#pragma mark -
#pragma mark Application lifecycle

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    

    MapViewController *viewController = [[MapViewController alloc] init];
    self.mapViewController = viewController;

    [viewController release];

    [window addSubview:self.mapViewController.view];
    [window makeKeyAndVisible];

    return YES;
}


- (void)dealloc {
    [mapViewController release];

    [window release];
    [super dealloc];
}


@end

Answer 1

I think

self.mapViewController = viewController;

is the problem. You do not have @synthesize for mapViewController. So you cannot access through self

Or another option is to try this

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    

    mapViewController = [[MapViewController alloc] init];
    [window addSubview:mapViewController.view];
    [window makeKeyAndVisible];

    return YES;
}