How can I check whether dark mode is enabled in iOS/iPadOS?

Question

Starting from iOS/iPadOS 13, a dark user interface style is available, similar to the dark mode introduced in macOS Mojave. How can I check whether the user has enabled the

Answer 1

Objective C

To detect when dark mode is enabled or disabled via the Control Centre use an "appDidBecomeActive" notification that will be triggered when you return to your app.

//----------------------------------------------------------------------------
//                          viewWillAppear
//----------------------------------------------------------------------------
- (void)viewWillAppear {
    [super viewWillAppear];

    [[NSNotificationCenter defaultCenter]addObserver:self
                                   selector:@selector(appDidBecomeActive:)
                                   name:UIApplicationDidBecomeActiveNotification
                                   object:nil];

}

Don't forget to remove it when you're finished:

//------------------------------------------------------------------------------------
//                    viewWillDisappear
//------------------------------------------------------------------------------------
- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];

    [[NSNotificationCenter defaultCenter] removeObserver:self        
                                 name:UIApplicationDidBecomeActiveNotification 
                                 object:nil];

}

Do what ever you need to when dark mode changes:

//----------------------------------------------------------------------------
//                          appDidBecomeActive
//----------------------------------------------------------------------------
-(void)appDidBecomeActive:(NSNotification*)note {
    if (@available(iOS 13.0, *)) {
        if( self.traitCollection.userInterfaceStyle == UIUserInterfaceStyleDark ){
            //dark mode
        }
        else {
            //not dark mode
        }
    }
    else {
        //fall back for older versions
    }
}