Objective-C method to detect whether the iOS device has a "notch," à la iPhone X.

detect_notch.m

#import <UIKit/UIKit.h>

/**
 * Return YES if iOS device has a notch; NO, otherwise.
 */
- (BOOL)hasDeviceNotch
{
    if (([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad)) {
        // Only iPhones may have a notch.
        return NO;
    }
    
    UIWindow* keyWindow = nil;

    for (id aScene in [[UIApplication sharedApplication] connectedScenes]) {
        UIWindow* window = [[aScene delegate] window];
        
        if ([window isKeyWindow]) {
            keyWindow = window;
            break;
        }
    }

    if (!keyWindow) {
        NSLog(@"[%@] WARNING: Unable to determine key window! Returning NO.", NSStringFromSelector(_cmd));
        return NO;
    }
    
    return [keyWindow safeAreaInsets].bottom > 0.0;
}