Adding Transparent Modal View Programatically– iPhone

Assuming you have a long process  taken so long that you want to show a transparent view, you can do it very easily by just adding the following method to your .m file and you will get the following transparent loading view

-(void)showLoadingView
{
	CGRect transparentViewFrame = CGRectMake(0.0, 0.0,320.0,480.0);
	transparentView = [[UIView alloc] initWithFrame:transparentViewFrame];
	transparentView.backgroundColor = [UIColor lightGrayColor];
	transparentView.alpha = 0.9;

	UIActivityIndicatorView *spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
	spinner.center = transparentView.center;
	[spinner startAnimating];

	UILabel *messageLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 280, 320, 30)];
	messageLabel.textAlignment = UITextAlignmentCenter;
	messageLabel.text = @"please wait...";

	[transparentView addSubview:spinner];
	[transparentView addSubview:messageLabel];

	[self.view addSubview:transparentView];

	[messageLabel release];
	[spinner release];
	[transparentView release];
}

Now, you should call this function whenever needed. Let’s say you have a background process that will run while the transparent loading view is shown, below is the code to handle this situation:

-(void)myAction:(id)sender
{
	[self showLoadingView];

	[self performSelectorInBackground:@selector(myActionBackground:) withObject:sender];
}

-(void)myActionBackground:(id)sender
{
        NSAutoreleasePool *apool = [[NSAutoreleasePool alloc] init];
	//your code
        [apool release];
}