从AppDelegate调用之后，performSegueWithIdentifier NSInvalidArgumentException

Question

Hey together,

I am calling a void with some parameters from the AppDelegate on my main view. This is done if a push notification is received:

MainViewController *mainView = [[MainViewController alloc] init];
[mainView showPushView:pushDataObject];

The called void @ the MainView doing some data operating stuff and after that it should load the pushView:

- (void)showPushView: (PFObject *)pushDataObject {
    NSLog(@"Push Data object transfered %@", pushDataObject);
    pushItem = pushDataObject;
    //All working fine to this point 
    [self performSegueWithIdentifier:@"showPushObject" sender:self];
}

Now the problem is that the app is crashing at [self performSegueWithIdentifier:@"showPushObject" sender:self]; with this Error:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 
'Receiver (<MainViewController: 0x145b80e0>) has no segue with identifier 'showPushObject''
*** First throw call stack:
(0x2e51fe83 0x3887c6c7 0x30f656d9 0xbeb11 0xb2a23 0x1745f7 0x38d610c3 0x38d610af 0x38d639a9 0x2e4ea5b1 0x2e4e8e7d 0x2e453471 0x2e453253 0x3318d2eb 0x30d08845 0xafecd 0x38d75ab7)
libc++abi.dylib: terminating with uncaught exception of type NSException

I think that there is a problem because I call the void from the AppDelegate, am I right?

Those anyone know a fix for that problem?

Thanks a lot! Best regards from Germany :)

PS If I call [self performSegueWithIdentifier:@"showPushObject" sender:self]; with a button or something on the MainViewController all working fine... :/

Answer 1

Your problem is this line:

MainViewController *mainView = [[MainViewController alloc] init];

because it means that the mainView instance doesn't have a storyboard (so it can't have any segues).

When you run it from a button the controller instance must have been created from a storyboard.

So, to fix, load the storyboard and instantiate mainView from it. Then the segue will work.

---

UIStoryboard *storyboard4Inch = [UIStoryboard storyboardWithName:@"Storyboard4Inch" bundle:nil];
UIViewController *mainViewController = [storyboard4Inch instantiateViewControllerWithIdentifier:@"MainViewController"];
[mainViewController showPushView:pushDataObject];

Answer 2

In order for the segue to work, you need to have the storyboard loaded in the mainView when you start it that way. Try instead something like this:

self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
UIViewController *firstViewController = [storyboard instantiateViewControllerWithIdentifier:@"kYourMainViewControllerIdentifier"];
self.window.rootViewController = firstViewController;
[self.window makeKeyAndVisible];

Remember to give an identifier to your root view controller and change it in this piece of code.