Question

I initialize an UINavigationController with my custom UIViewController subclass. But as soon as I want to present the view controller I get a SIGABRT error in Xcode. I have done this many times before and I assume that this problem existis because of other things that might not be correct in my current project. However, I find it very difficult to find the problem behind this phenomenon. So are there some things that you can do which somehow prevent the presentation of a modal view controller?

This is how I present my view controller:

- (IBAction)tutorialTouched:(id)sender {

    TutorialViewController *tutorialVC = [[TutorialViewController alloc]init];
    UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:tutorialVC];
    nav.modalPresentationStyle = UIModalPresentationFormSheet;

    // This line leads to `SIGABRT`
    [self presentModalViewController:nav animated:NO];
}

Deployment target is 5.0.

Update:
This is the information I get when typing bt into the console:

#0  0x945919c6 in __pthread_kill ()
#1  0x9645bf78 in pthread_kill ()
#2  0x9644cbdd in abort ()
#3  0x003169dc in uncaught_exception_handler ()
#4  0x032010fc in __handleUncaughtException ()
#5  0x02f00f0f in _objc_terminate ()
#6  0x0349e8de in safe_handler_caller ()
#7  0x0349e946 in std::terminate ()
#8  0x0349fb3e in __cxa_rethrow ()
#9  0x02f00e15 in objc_exception_rethrow ()
#10 0x03137de0 in CFRunLoopRunSpecific ()
#11 0x03137c9b in CFRunLoopRunInMode ()
#12 0x035ca7d8 in GSEventRunModal ()
#13 0x035ca88a in GSEventRun ()
#14 0x016b3626 in UIApplicationMain ()
#15 0x00002fad in main (argc=1, argv=0xbffff5a8) at /Users/myProject/main.m:14

Answer 1

The problem was caused due to an Outlet error inside my ViewController. I could not figure it out because the compiler never told me this. Only when I added a try / catch around the presentation of the view controller did I get the exception object, which finally told me what was wrong. Sorry for the confusion and thanks for your help.