A category on UIControl that makes it easy to handle control events with blocks, instead of target-action selectors.

UIControl+BlockActions.h

#import <UIKit/UIKit.h>

@interface UIControl (BlockActions)

- (id)addHandlerForControlEvents:(UIControlEvents)controlEvents block:(void(^)(id))aBlock;
- (void)removeHandlerForControlEventsWithToken:(id)aToken;

@end

UIControl+BlockActions.m

#import <objc/runtime.h>

#import "UIControl+BlockActions.h"

@implementation UIControl (BlockActions)

- (id)addHandlerForControlEvents:(UIControlEvents)controlEvents block:(void (^)(id))aBlock {
    static NSUInteger counter = 0;
    NSString *identifier = [NSString stringWithFormat:@"internalBlockAction_%d:", counter++];
    
    SEL blockSelector = NSSelectorFromString(identifier);
    IMP wrapper = imp_implementationWithBlock(^(id sender, SEL cmd) {
        aBlock(sender);
    });
    class_addMethod([self class], blockSelector, wrapper, "v@:");
    
    [self addTarget:self action:blockSelector forControlEvents:controlEvents];
    
    return identifier;
}

- (void)removeHandlerForControlEventsWithToken:(id)aToken {
    // since we can't really remove methods at runtime, just fake it
    class_replaceMethod([self class],
                        NSSelectorFromString(aToken),
                        imp_implementationWithBlock(^(id realSelf, SEL cmd) {}),
                        "v@:");
}

@end