Question

In my app i have reset button which delete all the data of tables and database.but before deleting i have to put alert view and ask the question as follows:

- (IBAction)resetData:(id)sender
{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Bills Data Entry"
                      message:@"Are you sure want to reset data?" delegate:nil
                      cancelButtonTitle:@"No" otherButtonTitles:@"Yes", nil];
    [alert show];
    [alert release];
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if (buttonIndex == 1) {

        [self databaseOpen];
        NSString *deleteData=[NSString stringWithFormat:@"delete from tbl_Bills"];
        [database executeQuery:deleteData];
        NSLog(@"inert query: %@",deleteData);
        NSLog(@"records deleted");
        [table reloadData];
        [database close];

        // DO STUFF
    }
}

This method is not called when i click on yes.

Answer 1

UIAlertView’s delegate must not be nil if you want to invoke its delegate method.

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Bills Data Entry"
                        message:@"Are you sure want to reset data?" delegate:self
                        cancelButtonTitle:@"No" otherButtonTitles:@"Yes", nil];