Question

My custom delegate does not receive a call. Here is my setup. ViewController has a SliderView object which is a subclass of UIScrollView:

SlideView.h

#import <UIKit/UIKit.h>

@protocol SlideViewDelegate <NSObject
@required
-(void) didTapImageData:(NSMutableArray*)imageData atIndex:(int)index;
@end

@interface SliderView : UIScrollView<UIGestureRecognizerDelegate> {
   __weak id<SlideViewDelegate> slideViewDelegate;
}

@property (nonatomic, weak) id<SlideViewDelegate> slideViewDelegate;

@end

SlideView.m

#import "SliderView.h"
@implementation SliderView
@synthesize slideViewDelegate;

- (void) handleTap:(UITapGestureRecognizer *)recognizer{
    NSLog(@"tapped");
   [[self slideViewDelegate] didTapImageData: imageData atIndex:0 ];
}

ViewController.h

@interface ViewController : UIViewController <
                                        UIScrollViewDelegate,
                                        SlideViewDelegate>{
   SliderView *thumbGalleryView;//delegate and reference are set in XCode
}

ViewController.m

#import "ViewController.h"
@implementation ViewController

-(void)didTapImageData:(NSMutableArray*) imageData atIndex:(int)index{
    NSLog(@"NOT WORKING HERE");
}

So ViewController never receives a call at the method above. The thumbGalleryView is linked to ViewController and delegate is set to ViewController too. SlideView‘s handleTap is printing message fine but [[self slideViewDelegate] didTapImageData: imageData atIndex:0 ]; is ignored. Why?

Answer 1

You have set the delegate which is ivar of scroll view.

You have to set the slideViewDelegate to ViewController

---

Edited

Add IBOutlet

IBOutlet __weak id<SlideViewDelegate> slideViewDelegate;

Then from your xib connect slideViewDelegate to ViewController
Also remember to change the class of scroll view to SliderView
Added Image for clarity