Question

I created this view controller which has a XIB file, and contains a UIButton.
I alloc and init the controller, and add the view to the superview:

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.vc = [[MyViewController alloc]init];
    [self.view addSubview:self.vc.view];
    CGRect frame;
    frame.size.height = 200;
    frame.size.width = 200;
    frame.origin.x = 100;
    frame.origin.y = 100;
    self.vc.view.frame = frame;
    [vc setText:@"123"];
}

When I run this, the UIButton is not shown. When I debug this, and put breakpoints in my controller’s viewDidLoad or viewDidAppear, the UIButton is always uninstantiated (memory adress 00000000);

what can be the problem?

Answer 1

Your MyViewController should be initialised with the XIB file:

...
self.vc = [[MyViewController alloc] @"MyViewController" bundle:nil];
...