How to pass Data to a ViewController created using instantiateViewControllerWithIdentifier? - ios

Question

I've created an app that uses a bunch load of Container views. Today i've found out that embedded segues are not supported in iOS 5 (thanks Xcode for letting me know.)
So right now I have a lot of embedded segues that passes data between one another.
I'm using this code to load ViewControllers inside a UIView instead of the Container from the IB:
RootViewController:
- (void)viewDidLoad
{
[super viewDidLoad];
UIStoryboard* storyboard = [UIStoryboard storyboardWithName:#"MainStoryboard" bundle:nil];
NewsViewController *news = [storyboard instantiateViewControllerWithIdentifier:#"NewsViewControllerID"];
news.view.frame = self.newsSection.bounds;
[self.newsSection addSubview:news.view];
[self addChildViewController:news];
[news didMoveToParentViewController:self];
// Do any additional setup after loading the view.
}
How can I use the above and still pass data to NewsViewController (something like prepare for segue)
I've tried inserting in the above something like
NewsViewController *news = [storyboard instantiateViewControllerWithIdentifier:#"NewsViewControllerID"];
news.view.frame = self.newsSection.bounds;
news.myLabel.text = #"Test";
[self.newsSection addSubview:news.view];
But the label won't change.
I prefer just to pass the data and not use a singleton or delegation.
Thanks

Answer 1

I would recommend creating a public method, from where you could pass the data you need on your NewsViewController controller. Still, the issue right now is that the you are updating the UI before it has been initialised. Also I would recommend you to have a look on how to create content UIViewControllers, because right now you are only adding its UIView. Check this document from Apple, look at the section Implementing a Custom Container View Controller. And this part of the code:
- (void) displayContentController: (UIViewController*) content;
{
[self addChildViewController:content]; // 1
content.view.frame = [self frameForContentController]; // 2
[self.view addSubview:self.currentClientView];
[content didMoveToParentViewController:self]; // 3
}
So in your case, after the step 3 has been made, you could pass the values you want to use inside your NewsViewController.

Answer 2

The problem could be that at the moment you are setting the text of the label, the label is still nil.
Try adding an NSString property to your NewsViewController (e.g. labelText), and in viewDidLoad do self.myLabel.text = self.labelText;.

Answer 3

you have pass the string your next view controller and viewDidLoad you have to the string.
Its not working because your view not yet created and if check the instance of UIlabel it will nil. So you have set the text in your next viewcontroller when it loaded in the memory.
Edit
you have create a property variable of NSString type(textString) in NewsViewController and pass the string as news.textString = #"Test";
and the in ViewDidLoad of NewsViewController set that string to label as myLabel.text = textString;
Better Explanation
-Declare NSString property in the NewsViewController.h
#property (strong, nonatomic) NSString *assignText;
-Instantiate normally, but assign the string and not the label.
UIStoryboard* storyboard = [UIStoryboard storyboardWithName:#"MainStoryboard" bundle:nil];
NewsViewController *news = [storyboard instantiateViewControllerWithIdentifier:#"NewsViewControllerID"];
news.assignText = #"Test";
[self addChildViewController:news];
-Then in your NewsViewController viewDidload, assign the label to the string.
-(void)viewDidLoad {
[super viewDidLoad];
self.myLabel.text = self.assignText;
}