Detecting iOS UIDevice orientation

Question

I need to detect when the device is in portrait orientation so that I can fire off a special animation. But I do not want my view to autorotate.

How do I override a

Answer 1

If you do not want to create device object, you can also use

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


- (void) orientationChanged:(NSNotification *)note
{
    if (UIDeviceOrientationIsLandscape([UIDevice currentDevice].orientation)){
        //Do something in landscape
    }
    else {
        //Do something in portrait
    }
}

Answer 2

In Swift 5.0.

DeviceOrientation vs. ScreenSize vs StatusBar.isLandscape?

If you want to detect changes of orientation in background, and also need to detect face up/down changes, check this link In Swift, how to get the device orientation correctly right after it's launched?

It covers how to correctly detect the orientation in Swift using 3 alternate ways to do it: - viewWillTransitionToSize() - Using Observer - Using the status bar