self.alphaWindow = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.alphaWindow.backgroundColor = [UIColor blackColor];
self.alphaWindow.windowLevel = UIWindowLevelAlert+1;
self.alphaWindow.hidden = NO;
self.alphaWindow.userInteractionEnabled = NO;
self.alphaWindow.rootViewController = [UIViewController new];
self.alphaWindow.alpha = 1-NIGHT_MODE_BRIGHTNESS;