UIAlertView in iOS,Iphone

Declare  UIAlertView in .h file like following...

UIAlertView * alert;

-(void)alertProgress

{

    alert = [[UIAlertView alloc]initWithTitle:@"Alert" message:@"wait..." delegate:self cancelButtonTitle:nil otherButtonTitles:nil, nil];

    UIActivityIndicatorView* activity = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];

    [alert addSubview:activity];

    activity.center = CGPointMake(140,80);

    activity.color = [UIColor whiteColor];

    [activity startAnimating];

    [alert show];

}

-(void)stopAlertProgress

{

    [alert dismissWithClickedButtonIndex:0 animated:YES];

}