I am trying to push a ViewController programmatically into a navigation controller, And I'm using my storyboard to create it.
here is my code :
+ (void) pushViewController:(NSString *) identifier ForItems:(NSMutableArray *) items sender:(UIViewController *) sender {
GenericViewController *viewController = (GenericViewController *)[sender.storyboard instantiateViewControllerWithIdentifier:identifier];
viewController.items = [[NSMutableArray alloc] init];
[viewController.items removeAllObjects];
[viewController.items addObject:[[NSMutableArray alloc] init]];
[viewController.items[0] addObjectsFromArray:items];
[sender.navigationController pushViewController:viewController animated:YES];
}
In GenericViewController viewDidLoad
I'm using my items
. Thanks to some break points I've seen that GenericViewController viewDidLoad
juste after the instantiateViewControllerWithIdentifier
with an items
equal to nil.
I thought that MyViewController viewDidLoad
is called during the pushViewController
method.
Any idea why viewDidLoad
is called during instantiateViewControllerWithIdentifier
?
---Update :---
Here my viewDidLoad
- (void)viewDidLoad
{
for (MyItem *currentItem in self.items[0]) {
[Do Something]
}
[super viewDidLoad];
[...]
}
self.items
is nil. so nothing is done.
To anyone that might still have the same problem.
I had a similar situation and solved it by just calling loadViewIfNeeded().
I could then access everything inside the view.
See: https://developer.apple.com/library/ios/documentation/uikit/reference/UIViewController_Class/Reference/Reference.html#//apple_ref/occ/instm/UIViewController/viewDidLoad
viewDidLoad
is called when the controller's view is loaded into memory.viewWillAppear
Notifies the view controller that its view is about to be added to a view hierarchy. I think this is when[self.navigationController pushViewController:viewController animated:YES];
is called.viewDidAppear
Notifies the view controller that its view was added to a view hierarchy. This is whenMyViewController
is added intonavigationController
.As voyage11 mentioned, viewDidLoad is called when the controller's view is loaded into memory, although someone has pointed out that this does not necessarily occur during the instantiateViewControllerWithIdentifier method.
Following your example code, I'd put the loop in the viewWillAppear method:
You can try to use "[self loadViewIfNeeded]" for obj-c or "self.loadViewIfNeeded()" for swift; 'self' = Your ViewController
apple: loadViewIfNeeded