UIAlertViewでdelegateをダラダラ書くのは嫌だ

UIAlertView+UIAlertView_BlocksExtension.h

#import <UIKit/UIKit.h>

@interface UIAlertView (UIAlertView_BlocksExtension)
typedef void (^UIAlertViewCallback_t)(NSInteger buttonIndex);

- (id)initWithTitle:(NSString *)title
            message:(NSString *)message
           callback:(UIAlertViewCallback_t)callback
  cancelButtonTitle:(NSString *)cancelButtonTitle
  otherButtonTitles:(NSString *)otherButtonTitles, ...;
@end

UIAlertView+UIAlertView_BlocksExtension.m

#import "UIAlertView+UIAlertView_BlocksExtension.h"
#import "UIAlertViewCallback.h"

@implementation UIAlertView (UIAlertView_BlocksExtension)

- (id)initWithTitle:(NSString *)title message:(NSString *)message callback:(UIAlertViewCallback_t)callback  cancelButtonTitle:(NSString *)cancelButtonTitle otherButtonTitles:(NSString *)otherButtonTitles, ...
{
    self = [self initWithTitle:title message:message delegate:nil cancelButtonTitle:cancelButtonTitle otherButtonTitles:nil];
    if (self) {
        va_list args;
        va_start(args, otherButtonTitles);
        for (NSString *arg = otherButtonTitles; arg != nil; arg = va_arg(args, NSString*)) {
            [self addButtonWithTitle:arg];
        }
        va_end(args);
        
        self.delegate = [[[UIAlertViewCallback alloc] initWithCallback:callback] autorelease];
    }
    return self;
}
@end

UIAlertViewCallback.h

#import <Foundation/Foundation.h>
#import "UIAlertView+UIAlertView_BlocksExtension.h"

@interface UIAlertViewCallback : NSObject<UIAlertViewDelegate>
{
    UIAlertViewCallback_t callback;
}
@property (nonatomic, copy) UIAlertViewCallback_t callback;

- (id)initWithCallback:(UIAlertViewCallback_t) callback;

@end

UIAlertViewCallback.m

#import "UIAlertViewCallback.h"

@implementation UIAlertViewCallback

@synthesize callback;

- (id)initWithCallback:(UIAlertViewCallback_t)aCallback
{
    if(self = [super init]) {
        self.callback = aCallback;
        [self retain];
    }
    return self;
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if (callback) {
        callback(buttonIndex);
    }
    [self release];
}

- (void)dealloc
{
    self.callback = nil;
    [super dealloc];
}

@end