iOS容器视图和父ViewController通信？

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:

1. set identifier for segue from your containerView to viewController
2. make property/variable myChildViewController in your parent view controller and property/variable myParentViewController in your child view controller
3. in your prepareForSegue method set this properties to be the reference to right objects
4. 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;

}