对uialertview进行子类化并将子类用作委托时出现问题

我有点问题。我将uiAlertView子类化,并将其命名为uiDisclaimerAlertView。

到目前为止,子类工作得很好。但现在我想用这个类作为自己的代理。所以在我的子类中,我使用了: self.delegate = self; 我这么做是因为我想把所有的都放在同一个类文件中。

现在我面临的问题是我的委托方法被调用,但是参数是 (null) .

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    NSLog(@"Trying: %@", buttonIndex);
}

[super setDelegate: self];

#import "UIDisclaimerAlertView.h"
#import "PremierSoinsAppDelegate.h"
#import "BlocTexte.h"

@implementation UIDisclaimerAlertView

@synthesize dialogKey, plist, plistPath;

- (id)initWithKeyAndBlocTexteId:(NSString *)key BlocTexteId:(NSString *)blocTexteId
{
    if (self = [super init])
    {       
        //  Fetching content
        BlocTexte *blocTexte = [[BlocTexte alloc] init];
        NSString *messageString = [[blocTexte getBlocTextes:blocTexteId] objectAtIndex:1];

        //  Setting superclass' properties
        self.title = @"Disclaimer";
        self.message = messageString;
        [super setDelegate: self];

        [self addButtonWithTitle: @"Ok"];
        [self addButtonWithTitle: @"Toujours"];

        //  Setting plist key
        self.dialogKey = key;

        //  Loading plist content
        PremierSoinsAppDelegate *AppDelegate = (PremierSoinsAppDelegate *)[[UIApplication sharedApplication] delegate];
        self.plistPath = [AppDelegate saveFilePath:@"disclaimers.plist"];
        self.plist = [[NSMutableDictionary alloc] initWithContentsOfFile:self.plistPath];

        [blocTexte release];
    }

    return self;
}

- (void)show {

    [super show];
}

- (void)toujours
{
    [self.plist setValue:@"1" forKey:self.dialogKey];
    [self.plist writeToFile:self.plistPath atomically:YES];
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    NSLog(@"Trying: %@", buttonIndex);
}

@end