Question

I want to pass values from a segmented controller in one view controller to another. I found another question about this, but i don’t understand how to actually implement the delegate method. (original question: Passing UISegmentedControl values from FlipSideViewController in an Utility application to the mainviewcontroller… )

FlipsideViewController.h

@protocol FlipsideViewControllerDelegate;
-(void)flipsideViewControllerSelectionChangedToIndex:(int)index;

@interface FlipsideViewController : UIViewController {
            id <FlipsideViewControllerDelegate> delegate;

        IBOutlet UISegmentedControl *mapType_;

    }
    @property (nonatomic, retain) UISegmentedControl *mapType_;

    @end

MainViewController.h

@interface MainViewController : UIViewController <XXXX> {
}

@property (nonatomic, retain) UISegmentedControl *mapType;

@end

MainViewController.m

-(void)flipsideViewControllerSelectionChangedToIndex:(int)index {
    if (index == 0) mapView.mapType = MKMapTypeStandard;
    if (index == 1) mapView.mapType = MKMapTypeSatellite;
    if (index == 2) mapView.mapType = MKMapTypeHybrid;
  }

How do I call the method in the MainViewController???

  -(void)flipsideViewControllerSelectionChangedToIndex:(int)index {

Very thankful for any answers.
Thanks in advance.

Answer 1

your utility view controller needs a pointer to the delegate
so

@property(weak) id< FlipsideViewControllerDelegate> delegate;

---

then in your utility view controller has a IBAction when the view changes and calls the delegate

- (IBAction)segmentedControlClicked:(id)sender {
    [self.delegate flipsideViewControllerSelectionChangedToIndex:[sender selectedSegment]];
}