Question

This is my first interface using a button to call another xib interface

-(IBAction)poli

UIViewController *ll = [[UIViewController alloc] initWithNibName:@"ViewController" bundle:nil];
[self presentModalViewController:ll animated:YES];

and second interface calling the previous one ….

-(IBAction)popaa

UIViewController *ui = [[UIViewController alloc] initWithNibName:@"Ra" bundle:nil];
[self presentModalViewController:ui animated:YES];

but there occurs a problem that shows

terminating app due to uncaught exception ‘NSUnknownKeyException‘, reason: [<UIViewController 0x7433230> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key pol

could someone explain the problem, i just want the first xib to show the second and second to show the first xib via a button.

Answer 1

Check if your xibs has any warning. Usually setValue:forUndefinedKey: is thrown when you have added some view in xib but the same is not added to your class code or the outlet is not defined properly. In this case you have added some view pol to your xib but the same is not present in your ll or ui class.

Also your dismiss method should be,

- (IBAction)popaa

  [self dismissViewControllerAnimated:YES];
}