Custom AlertView with Interface Builder

CustomAlertView.h

//
//  CustomAlertView.h
//  CustomAlert
//
//  Created by masaki.fuke on 2012/08/23.
//  Copyright (c) 2012年 masaki.fuke. All rights reserved.
//

#import <UIKit/UIKit.h>


@interface CustomAlertView : UIAlertView <UIAlertViewDelegate>

typedef void(^CustomAlertViewDismissBlock)(CustomAlertView *alertView, id sender);

-(id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil;
-(void)setDismissBlock:(CustomAlertViewDismissBlock)dismiss;


@property (strong, nonatomic) IBOutlet UIView *customView;
@property (strong, nonatomic) IBOutletCollection(UIButton) NSArray *alertButtons;

@end

CustomAlertView.m

//
//  CustomAlertView.m
//  CustomAlert
//
//  Created by masaki.fuke on 2012/08/23.
//  Copyright (c) 2012年 masaki.fuke. All rights reserved.
//

#import "CustomAlertView.h"

@implementation CustomAlertView
{
    CustomAlertViewDismissBlock _dismiss;
    id _pressedSender;
}

-(id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super init];
    if (self) {
        NSString *nibName = (nibNameOrNil) ? nibNameOrNil : NSStringFromClass([self class]);
        UINib *nib = [UINib nibWithNibName:nibName bundle:nibBundleOrNil];
        [nib instantiateWithOwner:self options:nil];
        self.delegate = self;
    }
    return self;
}

-(void)setDismissBlock:(CustomAlertViewDismissBlock)dismiss
{
    _dismiss = [dismiss copy];
}

-(void)show
{
    [super show];
    
    // アラートビューの要素をすべて隠す
    for (UIView *subview in self.subviews) {
        subview.hidden = YES;
    }
    
    // 中心を一時保存
    CGPoint c = self.center;
    // ビューの大きさをカスタムビューの大きさに合わせる
    self.bounds = self.customView.bounds;
    // 中心を戻す
    self.center = c;

    
    [self addSubview:_customView];
    _customView.hidden = NO;
    
    //ボタンにActionを仕込む
    for (UIButton *btn in self.alertButtons) {
        [btn addTarget:self action:@selector(pressedAction:) forControlEvents:UIControlEventTouchUpInside];
    }
}

-(void)pressedAction:(id)sender
{
    _pressedSender = sender;
    [self dismissWithClickedButtonIndex:0 animated:YES];
}

#pragma mark - UIAlertViewDelegate

-(void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
    if (_dismiss) {
        _dismiss(self, _pressedSender);
    }
}


@end