Ios – How to load a UIView using a nib file created with Interface Builder

cocoa-touchinterface-builderiosiphoneobjective c

I'm trying to do something a bit elaborate, but something that should be possible. So here is a challenge for all you experts out there (this forum is a pack of a lot of you guys 🙂 ).

I'm creating a Questionnaire "component", which I want to load on a NavigationContoller (my QuestionManagerViewController). The "component" is an "empty" UIViewController, which can load different views depending on the question that needs to be answered.

The way I'm doing it is:

  1. Create Question1View object as a UIView subclass, defining some IBOutlets.
  2. Create (using Interface Builder) the Question1View.xib (HERE IS WHERE MY PROBLEM PROBABLY IS). I set both the UIViewController and the UIView to be of class Question1View.
  3. I link the outlets with the view's component (using IB).

  4. I override the initWithNib of my QuestionManagerViewController to look like this:

    - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    if (self = [super initWithNibName:@"Question1View" bundle:nibBundleOrNil]) {
        // Custom initialization
    }
    return self;
}

When I run the code, I'm getting this error:

2009-05-14 15:05:37.152 iMobiDines[17148:20b] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[UIViewController _loadViewFromNibNamed:bundle:] loaded the "Question1View" nib but the view outlet was not set.'

I'm sure there is a way to load the view using the nib file, without needing to create a viewController class.

Best Answer

There is also an easier way to access the view instead of dealing with the nib as an array.

1) Create a custom View subclass with any outlets that you want to have access to later. --MyView

2) in the UIViewController that you want to load and handle the nib, create an IBOutlet property that will hold the loaded nib's view, for instance

in MyViewController (a UIViewController subclass)

  @property (nonatomic, retain) IBOutlet UIView *myViewFromNib;

(dont forget to synthesize it and release it in your .m file)

3) open your nib (we'll call it 'myViewNib.xib') in IB, set you file's Owner to MyViewController

4) now connect your file's Owner outlet myViewFromNib to the main view in the nib.

5) Now in MyViewController, write the following line:

[[NSBundle mainBundle] loadNibNamed:@"myViewNib" owner:self options:nil];

Now as soon as you do that, calling your property "self.myViewFromNib" will give you access to the view from your nib!

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