All my IBOutlet are nil in viewDidLoad

问题:

I've created a UIViewController that we can call MyViewController1. When I call MyViewController1, all my IBOutlet are nil in viewDidLoad (and in the rest of the code too).

When I create this controller by doing
MyViewController1 *vc = [[MyViewController1 alloc] init],

if I replace MyViewController1 by an other one, for example MyViewController2, it works. So I guess the problem is really in MyViewController1.

Last thing you might want to know, is that MyViewController1 is actually a subclass of MySuperViewController1 that is a UIViewController.

Thanks for your help !

---

EDIT

I realized my case was maybe more complicated. Here are my exact files :

// MySuperViewController1

MySuperViewController1.h

MySuperViewController1.m

MySuperViewController1.xib

// MyViewController1

MyViewController1.h

MyViewController1.m

So the nib belongs to the superclass, and not the subclass. Can I do that ?

回答1:

You should probably use :

MyViewController1 *vc = [[MyViewController1 alloc] initWithNibName:@"MyViewController1" bundle:nil]

calling init won't do the match with your xib file and won't alloc your differents IBOutlet

EDIT :

There are two possibles solutions :

First is calling init with super nibName :

MyViewController1 *vc = [[MyViewController1 alloc] initWithNibName:@"MySUperViewController1" bundle:nil]

The second is calling the super initWithNibName: in child init method :

-(id)init {
   if (self = [super initWithNibName:@"MySuperViewController1" bundle:nil]) {
        // Init
   }
   return self;
}

回答2:

I had the same problem after after breaking my head i realised naming the xib same as the class name solved my problem.

回答3:

Check whether IBoulet is linked properly with xib or not. Also check the files owner of your xib.

If your class name or xib name is changed Try to allocate you viewcontroller with proper xibName

MyViewController1 *vc = [[MyViewController1 alloc] initWithNibName:@"NibName" bundle:nil];