Loading bar over status bar?

Question

I've seen several apps do this, and i've been wondering how it's done. If you look at the Wunderkit app, when it loads something, there's a blue animated bar that slides down to cover the status bar until it finishes loading. How is this done?

Answer 1

you can subclass UIWindow. And set it windowLevel = UIWindowLevelStatusBar;

code:

@interface CHLoadingWindow : UIWindow

@implementation CHLoadingWindow
- (id)init
{
  self = [super init];
  if (self) {
    self.windowLevel = UIWindowLevelStatusBar;
    // then draw your UI
  }
  return self;
} 
@end

use it:

CHLoadingWindow *loading = [[CHLoadingWindow alloc] init];
[loading makeKeyAndVisible];

discover it:

[loading release];
loading = nil;

[[[[UIApplication sharedApplication] windows] objectAtIndex:0] makeKeyWindow];