Showing UIAlertView and calling back by blocks

a.md

The block syntax was introduced to iOS 4.0. This class enable you to write the code for showing alert and the call back blocks gathered in one place as bellow,

[MyAlertView alertWithTitle:@"Title" message:"some message"
                      cancelButtonTitle:@"OK"
clickedBlock:^(UIAlertView *alertView, NSInteger buttonIndex) {
                          switch (buttonIndex) {
                                //do something depending on the button index.
                          }
                      } cancelBlock:^(UIAlertView *alertView) {
                          // do something on cancel button
                      } otherButtonTitles:@"Hoge", nil];

MyAlertView.h

#import <Foundation/Foundation.h>

@interface MyAlertView : NSObject<UIAlertViewDelegate>{
    void (^clickedButtonAtIndex_)(UIAlertView* alertView, NSInteger buttonIndex);
    void (^cancel_)(UIAlertView* alertView);
}

@property(nonatomic,copy) void (^clickedButtonAtIndex)(UIAlertView* alertView, NSInteger buttonIndex);
@property(nonatomic,copy) void (^cancel)(UIAlertView* alertView);

+(void) alertWithTitle:(NSString*)title message:(NSString*)message cancelButtonTitle:(NSString*)cancelButtonTitle
          clickedBlock:(void (^)(UIAlertView* alertView, NSInteger buttonIndex))clickedButtonAtIndex cancelBlock:(void (^)(UIAlertView* alertView))cancel
     otherButtonTitles:(NSString*)titles,...;
-(id)initWithClickedBlock:(void (^)(UIAlertView* alertView, NSInteger buttonIndex))clickedButtonAtIndex cancelBlock:(void (^)(UIAlertView* alertView))cancel;

@end

MyAlertView.m

#import "MyAlertView.h"

@implementation MyAlertView

@synthesize clickedButtonAtIndex = clickedButtonAtIndex_;
@synthesize cancel = cancel_;

+(void) alertWithTitle:(NSString*)title message:(NSString*)message cancelButtonTitle:(NSString*)cancelButtonTitle
     clickedBlock:(void (^)(UIAlertView* alertView, NSInteger buttonIndex))clickedButtonAtIndex cancelBlock:(void (^)(UIAlertView* alertView))cancel
     otherButtonTitles:(NSString*)titles,...;
{
    
    MyAlertView* myAlertView = [[MyAlertView alloc] initWithClickedBlock:clickedButtonAtIndex cancelBlock:cancel];
    
    UIAlertView* alertView = [[UIAlertView alloc] initWithTitle:title message:message delegate:myAlertView cancelButtonTitle:cancelButtonTitle otherButtonTitles:titles, nil];
    [[alertView autorelease] show];
}

- (void) dealloc;
{
    [clickedButtonAtIndex_ release];
    [clickedButtonAtIndex_ release];
    [super dealloc];
}

-(id)initWithClickedBlock:(void (^)(UIAlertView* alertView, NSInteger buttonIndex))clickedButtonAtIndex cancelBlock:(void (^)(UIAlertView* alertView))cancel;{
    self = [super init];
    if (self) {
        self.clickedButtonAtIndex = clickedButtonAtIndex;
        self.cancel = cancel;
    }
    
    return self;
}

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

-(void)alertViewCancel:(UIAlertView *)alertView;
{
    cancel_(alertView);
    [self release];
}
@end