Delegates with three viewControllers - ios

Question

So I have 3 views as follows: viewController >> viewController2 >> viewController3.
In viewController3 I have created a Delegate Protocol. The protocol method is a simple method that prints out an NSLog.
When I call the delegates from ViewController3, only its parent (viewController2 ) responds not the (first) viewController. There are no errors.I think problem has got something to do with [v2 setDelegate:self]; in the viewController.m file.
Nevertheless,[self.v3 setDelegate:self]; works fine in ViewController2.m file.
Why does the (first) viewController delegate not respond ? Do delegates only work with its immediate child ??
> **ViewController.h**
#import <UIKit/UIKit.h>
#import "ViewController2.h"
#import "ViewController2.h"
#interface ViewController : UIViewController <PassData>{
ViewController2 *v2;
}
#property (strong, nonatomic) ViewController2 *v2;
> Blockquote
- (IBAction)button:(id)sender;
#end
> **ViewController.M**
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize v2;
- (IBAction)button:(id)sender {
v2 = [[ViewController2 alloc]initWithNibName:#"ViewController2" bundle:nil];
[v2 setDelegate:self];
[self.view addSubview:v2.view];
}
-(void)print: (BOOL)success;{
if (success == YES) {
NSLog(#"ViewController called");
}
}
#end
> > ViewController2.h
#import <UIKit/UIKit.h>
#import "ViewController3.h"
#interface ViewController2 : UIViewController <PassData> {
ViewController3 *v3;
}
#property (strong, nonatomic)ViewController3 *v3;
#property (retain) id delegate;
- (IBAction)button:(id)sender;
#end
ViewController2.m
#import "ViewController2.h"
#interface ViewController2 ()
#end
#implementation ViewController2
#synthesize v3,delegate;
- (IBAction)button:(id)sender {
v3 = [[ViewController3 alloc]initWithNibName:#"ViewController3" bundle:nil];
[self.v3 setDelegate:self];
[self.view addSubview:v3.view];
}
-(void)print: (BOOL)success;{
if (success == YES) {
NSLog(#"ViewController2 called");
}
}
#end
> ViewController3.h
#import <UIKit/UIKit.h>
#protocol PassData <NSObject>
#required
-(void)print:(BOOL)success;
#end
#interface ViewController3 : UIViewController {
id<PassData> delegate;
}
#property (retain) id delegate;
- (IBAction)callButton:(id)sender;
#end
ViewController3.m
#import "ViewController3.h"
#interface ViewController3 ()
#end
#implementation ViewController3
#synthesize delegate;
- (IBAction)callButton:(id)sender {
// call all delegates
[[self delegate]print:YES];
}
#end

Answer 1

v2 doesn't have a method "print", that's a protocol method of v3 -- you can't chain delegate messages like this. If you want multiple controllers to respond to something in another controller, then you should use an NSNotification -- any number of objects can register to receive a notification.