Setting self.window.rootViewController causes SIGABRT

Question

I am trying to do an application where you press a button then a UIAlertView comes up and there is a UIView inside it with 3 custom button. So far everything work. When i click on one of the 3 button i want to change the image of an UIImageView and that works as well. The problem is that out of nowhere a sigabrt is now happening each time i try to start my apps.

The SIGABRT happen in my AppDelegate.m on this line:

self.window.rootViewController = self.viewController;

If somebody can help me that would be great and by the way im not very used to xcode and objective-c so i don't have a clue why this is happening.

Here is my viewController.h

#import UIKit/UIKit.h (i removed < > cause they were hiding everything inbetween in the post.)

@interface savingstatusViewController : UIViewController {

    UIView *loginView;
    UIImageView *statusImage;
    UIAlertView * MyTicketAlert;

}

- (IBAction)status:(id)sender;

@property (nonatomic, retain) IBOutlet UIView *loginView;    
@property (nonatomic, retain) IBOutlet UIImageView *statusImage;
@property (nonatomic, retain) IBOutlet UIAlertView * MyTicketAlert;

- (IBAction)green:(id)sender;
- (IBAction)yellow:(id)sender;
- (IBAction)red:(id)sender;

@end

Here is my viewController.m

#import "savingstatusViewController.h"

@implementation savingstatusViewController

@synthesize loginView;
@synthesize statusImage,MyTicketAlert;

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

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

 #pragma mark - View lifecycle

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

- (void)viewDidUnload
{
    [self setLoginView:nil];
    [self setStatusImage:nil];
    [super viewDidUnload];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return YES;
}

- (IBAction)status:(id)sender
{
    MyTicketAlert = [[UIAlertView alloc] initWithTitle:nil message:nil  delegate:self cancelButtonTitle:nil
                                     otherButtonTitles: nil];
    [MyTicketAlert addSubview:loginView];
    [MyTicketAlert show];
    MyTicketAlert.frame = CGRectMake(0, 1000, 440, 110);
}

- (IBAction)green:(id)sender 
{
    statusImage.image = [UIImage imageNamed:@"etat_controle.png"];

     [MyTicketAlert dismissWithClickedButtonIndex:0 animated:YES];
}

- (IBAction)yellow:(id)sender
 {
    statusImage.image = [UIImage imageNamed:@"etat_attention.png"];

     [MyTicketAlert dismissWithClickedButtonIndex:0 animated:YES];
}

- (IBAction)red:(id)sender
 {
    statusImage.image = [UIImage imageNamed:@"etat_danger.png"];

     [MyTicketAlert dismissWithClickedButtonIndex:0 animated:YES];
}

@end

Answer 1

The UIWindow rootViewController property doesn't exist before iOS4. If you're trying to run this code on an device with iOS 3 or older, it will crash.

In your AppDelegate, you can use addSubview instead.

//self.window.rootViewController = self.viewController; // Only iOS >= 4
[self.window addSubview:self.viewController.view];
[self.window makeKeyAndVisible];
return YES;