iOS - UIImageView+Block

UIImageView+Block.h

//
//  UIImageView+Block.h
//
//  Created by Josh Holtz on 5/17/12.
//  Copyright (c) 2012 __MyCompanyName__. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface UIImageView (Block)

- (void) setOnTap:(void(^)())block;

@end

UIImageView+Block.m

//
//  UIImageView+Block.m
//
//  Created by Josh Holtz on 5/17/12.
//  Copyright (c) 2012 __MyCompanyName__. All rights reserved.
//

#import "UIImageView+Block.h"

#import "/usr/include/objc/runtime.h"

@implementation UIImageView (Block)

static char overviewKey;

- (void) setOnTap:(void(^)())block {
    
    [self setBlock:block];
    
    self.userInteractionEnabled = YES;
    UITapGestureRecognizer *tapGesturePearls =
    [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(onTap)];
    [self addGestureRecognizer:tapGesturePearls];
    
}

- (void)setBlock:(void(^)())block {
    objc_setAssociatedObject (self, &overviewKey,block,OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (void(^)())block {
    return objc_getAssociatedObject(self, &overviewKey);
}

- (void)onTap {
    void(^block)();
    block = [self block];
    block();
}

@end

UIImageViewBlock.h

//
//  UIImageView+Block.h
//
//  Created by Josh Holtz on 5/17/12.
//  Copyright (c) 2012 __MyCompanyName__. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface UIImageView (Block)

- (void) setOnTap:(void(^)())block;

@end

UIImageViewBlock.m

//
//  UIImageView+Block.m
//
//  Created by Josh Holtz on 5/17/12.
//  Copyright (c) 2012 __MyCompanyName__. All rights reserved.
//

#import "UIImageView+Block.h"

#import "/usr/include/objc/runtime.h"

@implementation UIImageView (Block)

static char overviewKey;

- (void) setOnTap:(void(^)())block {
    
    [self setBlock:[block copy]];
    
    self.userInteractionEnabled = YES;
    UITapGestureRecognizer *tapGesturePearls =
    [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(onTap)];
    [self addGestureRecognizer:tapGesturePearls];
    
}

- (void)setBlock:(void(^)())block {
    objc_setAssociatedObject (self, &overviewKey,block,OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (void(^)())block {
    return objc_getAssociatedObject(self, &overviewKey);
}

- (void)onTap {
    void(^block)();
    block = [self block];
    block();
}

@end

ViewController.m

- (void)someMethod {

        [imageView setOnTap:^{
            NSLog(@"Do some stuff in this block");
        }];

}