由于未捕获的异常“ NSInvalidArgumentException”而终止应用程序，原因：“应用程序试图在目标上显示nil模态视图控制器

Question

I'm new in iphone, I'm trying to open a view when pressing a button, in my class "ReaderViewController" I wrote the following code:

- (void)tappedInToolbar:(ReaderMainToolbar *)toolbar emailButton:(UIButton *)button
{
#ifdef DEBUGX
NSLog(@"%s", __FUNCTION__);
#endif

#if (READER_ENABLE_MAIL == TRUE) // Option

instantiateViewControllerWithIdentifier:@"searchView"];

if (printInteraction != nil) [printInteraction dismissAnimated:NO]; // Dismiss

SearchViewController *searchController = [self.storyboard instantiateViewControllerWithIdentifier:@"searchView"];


searchController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
searchController.modalPresentationStyle = UIModalPresentationFullScreen;

[self presentModalViewController:searchController animated:YES];


[searchController release];


#endif // end of READER_ENABLE_MAIL Option
}

I want when to open the view of this controller "SearchViewController" and in storyboard I gave the view of SearchViewController its identifier name "searchView" but when I run, it gives me the following Exception:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason:    'Application tried to present a nil modal view controller on target <ReaderViewController: 0x6864930>.'

Any Help ?? Thanks in advanced.

Answer 1

There's no view controller with the identifier searchView in your storyboard, so the instantiation fails and the

instantiateViewControllerWithIdentifier:

method returns nil. Double check your Storyboard setup and also note that identifiers and names are generally case-sensitive, maybe you named your view controller SearchView and not searchView .

It also may be the case that

self.storyboard

itself isn't properly initialized or instantiated, and thus is nil.

Edit : so you were creating the storyboard from code, but in fact you weren't. The solution was to manually instantiate UIStoryboard.

As for your own comment, you'd better assign self.storyboard = Storyboard or you'll continue getting these errors...

Answer 2

It looks to me like self.storyboard is nil . This means every message you are passing to it results in nil also.