iPhone center activity indicator regardless of screen orientation

Question

How can I center an activity indicator programmatically regardless of screen orientation?

Answer 1

Try setting the center property of your activity view, like this:

 activity.center = CGPointMake(self.view.frame.size.width/2,self.view.frame.size.height/2);

---

In viewDidLoad, register for notifications for the device rotation:

- (void)viewDidLoad {
   [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
   [[NSNotificationCenter defaultCenter] addObserver:self
        selector:@selector(didRotate:)
        name:UIDeviceOrientationDidChangeNotification object:nil];
}

and implement didRotate:

-(void)didRotate:(NSNotification *)notification {   
   if (activity) {
    activity.center = CGPointMake(self.view.frame.size.width/2,self.view.frame.size.height/2);
    }
}

Answer 2

I suggest you use https://github.com/jdg/MBProgressHUD Which is a great library for doing all kinds of "Loading" screens.