iOS viewDidLoad未被触发

Question

In my app I am putting a sub view into a view:

subViewController = [[SubViewController alloc] init];
NSArray *nibContents = [[NSBundle mainBundle] loadNibNamed:@"SubView" owner:subViewViewController options:nil];
UIView *view = [nibContents objectAtIndex:0];
view.frame = CGRectMake(2, 0, myView.frame.size.width - 4, myView.frame.size.height);
[myView addSubview:view];

But viewDidLoad inside SubViewController is never fired.

Here is the code:

- (void)viewDidLoad
{
  [super viewDidLoad];
   NSLog(@"ViewDidLoad");
}

In IB I have set files owner as SubViewController . I don't know where the problem is. Any ideas? Thank you.

Answer 1

-viewDidLoad is not called because you are not executing any code to force it to load. A view controller's view is lazy loaded . If you try to access or do something with subViewController.view it will call viewDidLoad on the controller because it will create the view then.

Answer 2

Just adding UIViewControllers view to another view wont make it "active" and it won't receive viewDidLoad, viewDidAppear, viewDidDisappear nor others.

I would do this:

subViewController = [[SubViewController alloc] initWithNibName:@"SubView" bundle:nil];
subViewController.view.frame = CGRectMake(2, 0, myView.frame.size.width - 4, myView.frame.size.height);
[self addChildViewController:subViewController];
[self.view addSubview:subViewController.view];
[subViewController didMoveToParentViewController:self];