Creating a “loading…” view using iPhone SDK

Question

How to create that black/gray modal popup kind of view that many apps use, when some long pending operation is in progress?

Like when using location based services, load

Answer 1

I use LoadingHUDView for this purpose, and it works always.

get LoadingHUDView.m and LoadingHUDView.h and do the following in your base class (or whatever)

#pragma mark ActivityIndicator Methods

-(void) showModalActivityIndicator:(NSString *)message 
{
        loadingView = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)]retain];//  origional
        //loadingView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)]; //testing
        loadingView.backgroundColor = [UIColor grayColor]; //[UIColor colorWithRed:1 green:1 blue:1 alpha:0.3];
        LoadingHUDView *loadHud = [[LoadingHUDView alloc] initWithTitle:message];
        loadHud.center = CGPointMake(160, 290);
        [loadingView addSubview:loadHud];
        [loadHud startAnimating];
        [loadHud release];
        [loadingView setAlpha:0.0];
          [self.tableView addSubview:loadingView];
        [UIView beginAnimations:@"fadeOutSync" context:NULL];
        [UIView setAnimationDelegate:self];
        [UIView setAnimationDuration:0.5];
        [loadingView setAlpha:0.5];
        [UIView commitAnimations];
}

-(void) hideModalActivityIndicator {
    if (loadingView) {
    [UIView beginAnimations:@"fadeOutSync" context:NULL];
    [UIView setAnimationDidStopSelector:@selector (removeTranparentView) ];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDuration:0.5];
    [loadingView setAlpha:0];
    [UIView commitAnimations];
        }
}

-(void)removeTranparentView
{
    [loadingView removeFromSuperview];
    [loadingView release];
    loadingView = nil;
}

HOPE THIS HELPS. thank you