UIDevice extension to identify the front face colour of your device

UIDevice+faceColor.m

typedef NS_ENUM(NSUInteger, UIDeviceFaceColor) {
	UIDeviceFaceColorUnknown = 0,
	UIDeviceFaceColorBlack,
	UIDeviceFaceColorWhite,
};

...

@implementation UIDevice (Utils)

- (UIDeviceFaceColor)faceColor
{
	static UIDeviceFaceColor color = UIDeviceFaceColorUnknown;
#if (TARGET_OS_IOS == 1)
#if !(TARGET_OS_SIMULATOR)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
	static dispatch_once_t onceToken;
	dispatch_once(&onceToken, ^{
		NSString *colStr = nil;
		SEL sel = NSSelectorFromString([@[ @"_", @"device", @"Info", @"ForKey:" ] componentsJoinedByString:@""]);
		if ([self respondsToSelector:sel])
			colStr = [self performSelector:sel withObject:@"DeviceColor"];
		if (![colStr isKindOfClass:[NSString class]]) {}
		else if ([colStr containsSubstring:@"#3b3b"] ||
		  [colStr containsSubstring:@"#2727"] ||
		  [colStr isEqualToString:@"black"])
			color = UIDeviceFaceColorBlack;
		else if ([colStr containsSubstring:@"#e4e7"] ||
		  [colStr containsSubstring:@"#e1e4"] ||
		  [colStr isEqualToString:@"white"])
			color = UIDeviceFaceColorWhite;
	});
#pragma clang diagnostic pop
#endif
#endif
	return color;
}

@end

This UIDevice extension allows you to identify the front face colour of your device. It makes use of an undocumented / private API call _deviceInfoForKey: thus it's not considered to be completely safe, but this approach could give you a change for use, probably even in the App Store release. 🎱 Should work well with iOS7+. For iOS6, perform the call on deviceInfoForKey: without the leading _.