How to code the delegate pattern in objective C - objective-c

Question

I'm trying to pass JSON to VenueIDController by implementing delegate/protocols. however it doesn't seem to work. Please let me know what I'm missing.
I even put in an log in the fetch method to see if it is getting called but it doesn't even log which means it isn't getting called please help.
I have a FetchVenuesViewController.h
#import "VenueTableViewController.h"
#import "VenueIDController.h"
#interface FetchVenuesViewController : UIViewController< VenueTableViewControllerDelegate, VenueIDControllerDelegate>{
NSDictionary* venueJSON;
NSDictionary* idJSON;
};
#property (strong) NSDictionary* idJSON;
- (void)VenueFetch;
- (void)IDFetch;
#end
In FetchVenuesViewController.m
#synthesize idJSON;
- (void)IDFetch {
//request some webservice
NSData *data = [NSURLConnection sendSynchronousRequest:request
returningResponse:&response
error:&error];
//save the response
if (data) {
id IDJSON = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];
if (!IDJSON) {
//handle error
}
else {
//do something
}
} else {
// fetch failed
}
activityIndicator.hidden = NO;
}
-(NSDictionary *)getID{
[self IDfetch];
NSLog(#"json%#",idJSON);
return idJSON;
}
In VenueIDController.h
#protocol VenueIDControllerDelegate;
#interface VenueIDController : UIViewController{
}
#property (assign) id <VenueIDControllerDelegate> delegate;
-(IBAction)getIDData:(id)sender;
#end
#protocol VenueIDControllerDelegate <NSObject>
-(NSDictionary *)getID;
#end
and in VenueIDController.m
#interface VenueIDController (){
NSMutableArray* IDData;
UIImage* IDBarcode;
}
-(void) displayIDData:(NSDictionary*)data;
#end
#implementation VenueIDController
#synthesize delegate;
-(void) displayIDData:(NSDictionary*)data{
[delegate getID];
NSDictionary* idJSON = data;
}

Answer 1

This seems wrong:
-(void) displayIDData:(NSDictionary*)data{
[delegate getID];
NSDictionary* idJSON = data;
}
You are calling the delegate method and throwing away its result.