UIAlert View-for yes/no condition

Question

Hi friends,my app needs alert msg and if yes button pressed then one more alert msg and then i have to called a method.This is my code:

-(IBAction)resetPressed:(id)sender
{
    NSString *title= [NSString stringWithFormat:@"Warning"];
    NSString *message = [NSString stringWithFormat:@"Are you sure you want to Reset"];
    NSString *ok = [NSString stringWithFormat:@"No"];

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title
                                                    message:message
                                                   delegate:self 
                                          cancelButtonTitle:ok otherButtonTitles:@"Yes",nil];
    [alert show];
    [alert release];
}


- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
    if (alertView.tag ==1)
    {
        NSString *title= [NSString stringWithFormat:@"Warning"];
        NSString *message = [NSString stringWithFormat:@"Are you sure you want to Reset"];
        NSString *ok = [NSString stringWithFormat:@"No"];

        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title
                                                        message:message
                                                       delegate:self 
                                              cancelButtonTitle:ok otherButtonTitles:@"Yes",nil];
        alert.tag =2;
        [alert show];
        [alert release];

    }
    else if(alertView.tag ==2)
    {
        [self resetArray];
    }
}

Thanks.

Answer 1

Please define two separate UIAlertView in .h file

@interface XYZViewController:UIViewController
{
     UIAlertView  *firstAlertView;
     UIAlertView  *secondAlertView;
}

Now in your .m file modify as below:

-(IBAction)resetPressed:(id)sender
{
    NSString *title= [NSString stringWithFormat:@"Warning"];
    NSString *message = [NSString stringWithFormat:@"Are you sure you want to Reset"];
    NSString *ok = [NSString stringWithFormat:@"No"];

    if(firstAlertView == nil)
    {
       firstAlertView = [[UIAlertView alloc] initWithTitle:title message:message delegate:self cancelButtonTitle:ok otherButtonTitles:@"Yes",nil];
    }
    [firstAlertView show];

}

 - (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
    if (alertView == firstAlertView)
    {
        NSString *title= [NSString stringWithFormat:@"Warning"];
        NSString *message = [NSString stringWithFormat:@"Are you sure you want to Reset"];
        NSString *ok = [NSString stringWithFormat:@"No"];

        if(secondAlertView == nil)
        {
            secondAlertView = [[UIAlertView alloc] initWithTitle:title message:message delegate:self cancelButtonTitle:ok otherButtonTitles:@"Yes",nil];
        }
        [secondAlertView show];
    }
    else if(alertView == secondAlertView)
    {
        [self resetArray];
    }
}

and in dealloc method please release the allocated UIAlertviews.

Hope i am clear to you.

Thanks,
Jim.

Answer 2

Hi,

I'm not sure what your goal is but a few things look wrong to me anyways:

First of all you should create your strings this way:

NSString *title= @"Warning";

There's no need to use stringWithFormat in your case.

Then, it doesn't seem you properly set the first UIAlert's tag to 1, and the default value for tags is 0 so I guess the if statements in didDismissWithButtonIndex are never true.

Also, you should check which button was pressed using buttonIndex, otherwise you are going to show both alert and call [self resetArray] whichever button is pressed by the user.

Hope that helps.

Answer 3

In your code, you create the first alert, but never actually set the tag on it. You should do:

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title
                                                    message:message
                                                   delegate:self 
                                          cancelButtonTitle:ok otherButtonTitles:@"Yes",nil];

alert.tag = 1; //Or 2, or something.
[alert show];
[alert release];

Then the code in your delegate method will run.