Problems with storyboard - objective-c

Question

recently I started using storyboard and I've the following situation: I want to set the text of an UILabel from the AppDelegate. So I created an instance of my ViewController
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:#"MainStoryboard"
bundle: nil];
ViewController *controller = (ViewController*)[mainStoryboard
instantiateViewControllerWithIdentifier: #"mainViewController"];
myViewController = controller;
[window addSubview:myViewController.view];
[window makeKeyAndVisible];
and called the following method from the delegate
- (void) updateParameterLabel:(NSString *)parameter {
NSLog(#"URL-2: %#", parameter);
parameterLabel.text = parameter;
}
But the parameter is not shown in the UI.
Another think, which is kind of strage:
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
NSLog(#"View did Appear");
}
The "View did appear" is logged twice ...
Any hints?
Regards,
Sascha

Answer 1

Setting the text of a UILabel from your application delegate isn't great design. Your view controllers should be managing the content of your views, hence their name. Typically your storyboard is instantiated automatically, and you don't need any of the storyboardWithName et code you've got, assuming you're working with Apple's default templates.
Maybe think about re-architecting your application to follow the 'model-view-controller' pattern more strictly, and also look at how Apple instantiate storyboards automatically (just create a new storyboard project in XCode to see this).

Answer 2

If you still want to make it work, make the UILabel a property of your viewcontroller and set the label by using
In delegate :
- (void) updateParameterLabel:(NSString *)parameter {
NSLog(#"URL-2: %#", parameter);
[myViewController updateParemeter:parameter];
}
In myViewController:
- (void) updateParameterLabel:(NSString *)parameter {
NSLog(#"URL-2: %#", parameter);
parameterLabel.text = parameter;
[self.view setNeedsDisplay];//edit
}
So use the viewController to update your label. Of course you need the label as a property in your viewController

Answer 3

For what I see you are trying to update the label before it appears, so why don't you try calling your updateLabel method in the viewWillAppear, it would be something like this
-(void)viewWillAppear:(BOOL)animated{
[self updateParameterLabel:#"Some Text"];
[super viewWillAppear:YES];
}
And updateParameterLabel has to be implemented in the viewController.