Why does my iOS app crash when trying presentModalViewController?
- by user555807
I've been banging my head against this all day, it seems like something simple but I can't figure it out.
I've got an iOS app that I created using the "View-based Application" template in XCode. Here is essentially the code I have:
AppDelegate.h:
#import <UIKit/UIKit.h>
@interface AppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
MainViewController *viewController;
}
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet MainViewController *viewController;
@end
AppDelegate.m:
#import "AppDelegate.h"
#import "MainViewController.h"
@implementation AppDelegate
@synthesize window, viewController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
[self.window addSubview:viewController.view];
[self.window makeKeyAndVisible];
return YES;
}
- (void)dealloc {
[viewController release];
[window release];
[super dealloc];
}
@end
MainViewController.h:
#import <UIKit/UIKit.h>
@interface MainViewController : UIViewController {
}
-(IBAction) button:(id)sender;
@end
MainViewController.m:
#import "MainViewController.h"
#import "ModalViewController.h"
@implementation MainViewController
...
-(IBAction) button:(id)sender {
ModalViewController *mvc = [[[ModalViewController alloc] initWithNibName:NSStringFromClass([ModalViewController class]) bundle:nil] autorelease];
[self presentModalViewController:mvc animated:YES];
}
@end
There's nothing of interest in the ModalViewController.
So the modal view should display when the button is pressed. When I press the button, it hangs for a second then crashes back to the home screen with no error message.
I am stumped, please show me what I'm doing wrong!
