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

This is actually the undocumented (in 2.2.1 anyway) UIProgressHUD. Create one like this:

In your .h:

@interface UIProgressHUD : NSObject 
- (UIProgressHUD *) initWithWindow: (UIView*)aWindow; 
- (void) show: (BOOL)aShow; 
- (void) setText: (NSString*)aText; 
@end 

In your .m:

- (void) killHUD: (id)aHUD 
{ 
[aHUD show:NO]; 
[aHUD release]; 
} 

- (void) presentSheet 
{ 
id HUD = [[UIProgressHUD alloc] initWithWindow:[contentView superview]]; 
[HUD setText:@"Doing something slow. Please wait."]; 
[HUD show:YES]; 
[self performSelector:@selector(killHUD:) withObject:HUD afterDelay:5.0]; 
}