iOS NSInvalidArgumentException: Unrecognized selector sent to instance

Question

I am trying to follow the code in this example: iOS 6: How do I restrict some views to portrait and allow others to rotate?

I created a subclass of UINavigationController called customNavigationController:

customNavigationController.m

@implementation CustomNavigationController
- (BOOL)shouldAutorotate
{
    return YES;
}

- (NSUInteger)supportedInterfaceOrientations
{
    if (self.landscapeOK) {
        NSLog(@"all orientation ok");
        return UIInterfaceOrientationMaskAllButUpsideDown;
    }
    NSLog(@"only portrait orientation");
    return UIInterfaceOrientationMaskPortrait;
}

@end

CustomNavigationController.h

@interface CustomNavigationController : UINavigationController

@property (nonatomic) BOOL landscapeOK;

@end

Then in my app, I try setting the landscapeOK property in viewWillAppear:

-(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:YES];
    [(CustomNavigationController*)[self navigationController] setLandscapeOK:NO];
}

When I run [(CustomNavigationController*)[self navigationController] setLandscapeOK:NO]; I get the error

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UINavigationController setLandscapeOK:]: unrecognized selector sent to instance 0x10091ee00'

What am I doing wrong?

You need to actually create a `CustomNavigationController` instead of a `UINavigationController` where you are creating it, you can't just cast something and have it magically change types. — dan, Sep 01 '15 at 21:00
@dan can you explain how that would look different than what I've done? — scientiffic, Sep 01 '15 at 21:09
That would depend on where you are creating it. If you create it in the storyboard then you should select the navigation controller and set a custom class in the identity inspector. If you create it in code then change `[UINavigationController alloc]` to `[CustomNavigationController alloc]` — dan, Sep 01 '15 at 21:11
@dan thanks, I was missing that critical element! Adding a custom class to my storyboard fixed the problem. If add this as an answer, I will mark it as correct. — scientiffic, Sep 01 '15 at 21:17

score 1 · Accepted Answer · answered Sep 01 '15 at 21:19

1

You have to set the custom class in the identity inspector for your navigation controller in your storyboard to CustomNavigationController.

answered Sep 01 '15 at 21:19

dan

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iOS NSInvalidArgumentException: Unrecognized selector sent to instance

1 Answers1