iOS Container View and Parent ViewController communication? - ios

Question

How can I communicate with container view controller and parent view controller? I've tried to make a communication and pass the value between them. I've added a container view in the green view controller. And I had set segue name with "communicateSegue". I've searched some methods, I know we can set the prepareForSegue to pass the value at initial.
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"communicateSegue"]) {
NSLog(#"call prepare for segue at parent view controller");
}
}
But now I want to pass value and change the label in the different viewcontroller . Not at the initial.
I don't know how to do?
Question:
Have anyone know how to implement ParentViewController pass value to Container View Controller and show the label in the ContainerViewController?
And reverse , Container View Controller click the button then pass the value and change the label show in the ParentViewController with objective-c?
Thanks.
My declare variable in parentViewController.h:
#import
#interface ParentViewController : UIViewController
#property (weak, nonatomic) IBOutlet UITextField *parentTF;
#property (weak, nonatomic) IBOutlet UIButton *passValToChildVCBtn;
#property (weak, nonatomic) IBOutlet UILabel *showContainerValLB;
#property (weak, nonatomic) IBOutlet IBAction *passValueToContainerEvent;
#end
In the ContainerChildViewController.h
#import
#interface ContainerChildViewController : UIViewController
#property (weak, nonatomic) IBOutlet UILabel *showParentValLB;
#property (weak, nonatomic) IBOutlet UITextField *childTF;
#property (weak, nonatomic) IBOutlet UIButton *passToParentBtn;
#property (weak, nonatomic) IBOutlet IBAction *passValueToParentBtnEvent;
#end
test project in the here.
thank you very much.

Answer 1

Regarding passing value to the containerView controller, you can make a property in the ChildViewController of the value you want it to be passed. Then in your ParentViewController do something like the following:
self.ChildViewController.yourProperty = yourValue
The opposite can be done in 4 ways:
You can make a delegate protocol to communicate the data between your controllers.
You can post a notification in your ChildViewController and add the parent controller as an observer.
You can use KVO.
And the easiest way out, you can make a property in your parentviewController and access it like the following
((YourParentViewControllerClassType *)self.parentViewController).yourParentProperty = TheValueYouWant;

Answer 2

I do it like this:
set identifier for segue from your containerView to viewController
make property/variable myChildViewController in your parent view controller and property/variable myParentViewController in your child view controller
in your prepareForSegue method set this properties to be the reference to right objects
Now you can access to properties of parent/child view controller through this references.
Example in Swift:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "YourIdentifier" {
// Set references
myChildViewController = segue.destinationViewController as! YourChildViewController
myChildViewController.myParentViewController = self
}
}
Example in Objective C
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"YourIdentifier"]) {
// Set references
myChildViewController = [segue destinationViewController];
myChildViewController.myParentViewController = self
}
}
I did't try the objective C code becouse I don't ever use it. It is just an example to get the idea.
After that you can set any property of parent from child view controller as:
myParentViewController.property = value
and in your parent view controller:
myChildViewController.property = value
Hope this helps anyone!

Answer 3

Is pretty simple, the UIStoryboardSegue contains a reference to your destination view controller using the property -destinationViewController.
In the method -prepareForSegue you can access it and pass the data that you need.
If you need to pass data from child to parent, I strongly suggest you to avoid hard coupling and use something such as delegation or notification pattern.
Remember that your parent view controller already contains a reference to you child view controllers and you can simply access it by using -childViewControllers property.

Answer 4

you can use NSNotificationCenter for updating all screens or you can do this way..
create a property in ContainerChildViewController.h
#property(nonatomic,copy)NSString * mytextString;
this property will be accessible in your ParentViewController.h if you import ContainerChildViewController.h
you have to create a NSString in ParentViewController.h
in this you can set button action to copy textfielddata.text
then you can assign this value to your ContainerChildViewcontroller's
as
// create an instance of 2nd view controller as second in ParenViewController
UIStoryboard *mystoryboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
ContainerChildViewController * second= [mystoryboard instantiateViewControllerWithIdentifier:#"ContainerChildViewController"];
second.mytextString = self.mytextString;
// either you directly pass this value or use the string it should work both ways
NSLog(#"%#",second.orderID);
[self.navigationController pushViewController:second animated:YES];
Reply if it works

Answer 5

try this
- (IBAction)showDetail:(UIButton *)sender {
DetailViewController *detailVc = [self.childViewControllers firstObject];
detailVc.lable.text = sender.titleLabel.text;
}