Passing values between views using UISegmentedControl - iphone

Question

I'm trying to pass an integer between two views. When I return from View1 to MainView, the value is not passed and the NSLog(#"Changed map") is not showing in the console. I looked for the answer and tried everything, but it just won't work! Feels like somethings wrong with the delegate...
Any ideas?
View1.h
#class FlipsideViewController;
#protocol FlipsideViewControllerDelegate
- (void)flipsideViewControllerDidFinish:(FlipsideViewController *)controller;
-(void)flipsideViewControllerSelectionChangedToIndex:(int)index;
#end
#interface FlipsideViewController : UIViewController {
}
#property (weak, nonatomic) id <FlipsideViewControllerDelegate> delegate;
#property (nonatomic, retain) IBOutlet UISegmentedControl *mapType;
- (IBAction)valueChangedMap:(id)sender;
#end
View1.m
-(IBAction)valueChangedMap:(id)sender {
[self.delegate flipsideViewControllerSelectionChangedToIndex:[sender selectedSegmentIndex]];
NSLog (#"%d",[sender selectedSegmentIndex]);
[self dismissViewControllerAnimated:YES completion:nil];
}
MainView.h
#interface MainViewController : UIViewController <FlipsideViewControllerDelegate, UIPopoverControllerDelegate, MKMapViewDelegate> {}
#property (weak, nonatomic) IBOutlet MKMapView *mapView;
#property(weak) id<FlipsideViewControllerDelegate> delegate;
#end
MainView.m
-(void)flipsideViewControllerSelectionChangedToIndex:(int)index {
NSLog(#"Changed map");
if (index == 0) mapView.mapType = MKMapTypeStandard;
if (index == 1) mapView.mapType = MKMapTypeHybrid;
if (index == 2) mapView.mapType = MKMapTypeSatellite;
}

Answer 1

You only need an actual delegate property on your view1, and your mainView simply needs to respond to that delegate protocol. Here is what your delegate protocol should look like:
#property(nonatomic,unsafe_unretained) id delegate;
Now in your code when, mainview presents or pushes view1 you need to wire up the delegate like this (pseudo code):
view1.delegate = self;
Also a few nitpicks... you should never have a viewcontroller dismissing itself, mainView should dismiss the view1 when that 'finished' delegate method fires. In addition you should always check that a delegate responds to a selector before firing:
if([self.delegate respondsToSelector:#selector(yourselectorname)]) {
[self.delegate yourselectorname];
}