How can I send selectedSegmentIndex to containerView in Objective-c? - objective-c

Question

I have a containerView into my viewController. My viewController has a UISegmentedControl.
How can I send this selectedSegmentIndex selected at this moment and everytime when I change this?
I', trying with a property in the next class with prepareForSegue but this only send on first load..
Thanks!
Then Edit I'm getting: -[ViewController containerViewDidChangeSegmentIndex:]: unrecognized selector sent to instance 0x7f8db16286d0
FirstViewController (This contains A select and a containerView)
ViewController.h
#interface ViewController : UIViewController
#property (weak, nonatomic) IBOutlet UISegmentedControl *select;
#property (weak, nonatomic) IBOutlet UIView *container;
#property(nonatomic, assign) ContainerViewController * classLevelReference;
#end
ViewController.m
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[_select addTarget:self action:#selector(segmentChanged:) forControlEvents:UIControlEventValueChanged];
}
- (void)segmentChanged:(UISegmentedControl *)segment{
//since you've reference to your container view here, you can directly call its method here:
[self.classLevelReference containerViewDidChangeSegmentIndex:segment.selectedSegmentIndex];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
//don't forget to check the segue id, if you've multiple segues
ContainerViewController *containerView = [segue destinationViewController];
self.classLevelReference = self;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
ContainerViewController.h
#interface ContainerViewController : UIViewController
- (void)containerViewDidChangeSegmentIndex:(NSInteger)updatedIndex;
#end
ContainerView.m
#implementation ContainerViewController
- (void)containerViewDidChangeSegmentIndex:(NSInteger)updatedIndex{
//Do whatever you want with your updated index
NSLog(#"changing");
}
#end

Answer 1

You might want to make a method in your ContainerViewController.h like this:
#interface ContainerViewController:UIViewController
//.....other implementation here.
- (void)containerViewDidChangeSegmentIndex:(NSInteger)updatedIndex;
#end
Now implement this method in your ContainerViewController.m like this:
- (void)containerViewDidChangeSegmentIndex:(NSInteger)updatedIndex{
//Do whatever you want with your updated index
}
Now in your prepare for segue, save the reference to your ContainerViewController in a class-level variable :
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
//don't forget to check the segue id, if you've multiple segues
ContainerViewController *containerView = [segue destinationViewController];
self.classLevelReference = containerView;
}
Lastly in the FirstViewController.m, tell the container view when segment index changes.
- (void)viewDidLoad{
//.....your other implementation here.....
//add a listener to your segment's value changed action
[youregements addTarget:self action:#selector(segmentChanged:) forControlEvents:UIControlEventValueChanged];
}
- (void)segmentChanged:(UISegmentedControl *)segment{
//since you've reference to your container view here, you can directly call its method here:
[self.classLevelReference containerViewDidChangeSegmentIndex:segment.selectedSegmentIndex];
}
Important: you might've different names for the ContainerViewController and FirstViewController in your case, just apply the changes carefully.
Happy coding!