UIView above an UIAlertView

I have an UIAlertView which has an Button. By pressing that button I need to load a Camera controller(Image Picker) above the UIAlertView. Pressing cancel in ImagePicker will go back to UIAlertView of Previous view.

Any Help is Greatly appreciated. Thanks in Advance.

{

    UIButton *aStartTimer = [[UIButton alloc]initWithFrame:CGRectMake(90, 170, 45, 45)];
    [aStartTimer setImage:[UIImage imageNamed:@"timer.png"] forState:UIControlStateNormal];

    [alertView addSubview:aS开发者_JAVA百科tartTimer];
}

Thanks in advance

        UIAlertView * alertAddImage = [[UIAlertView alloc] init];
        [alertAddImage setDelegate:self];
        [alertAddImage setTitle:@"Add Images"];

        [alertAddImage addButtonWithTitle:@"Take a New Picture"];
        [alertAddImage addButtonWithTitle:@"Cancel"];
        [alertAddImage setNeedsLayout];
        [alertAddImage show];
        [alertAddImage release];

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
if (buttonIndex == 0)
    [self imageFromCamera];
}

-(void)imageFromCamera{
 imgPicker.sourceType = UIImagePickerControllerSourceTypeCamera;
 [self presentModalViewController:imgPicker animated:YES];
}