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UINavigationController 背景设置

# ios 13 前
self.navigationBar.barTintColor = C_THEME_2;//#2266EF;
self.navigationBar.backgroundColor = C_THEME_2;
self.navigationBar.titleTextAttributes = [NSDictionary dictionaryWithObject:[UIColor whiteColor] forKey:NSForegroundColorAttributeName];
self.navigationBar.tintColor = [UIColor whiteColor];
self.navigationBar.shadowImage = [[UIImage alloc] init];
self.navigationBar.translucent = YES;

# ios 13 后
if (@available(iOS 13.0, *)) {
		UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc] init];
		[appearance configureWithOpaqueBackground];
		appearance.backgroundColor = C_THEME_2;
		appearance.titleTextAttributes = [NSDictionary dictionaryWithObject:[UIColor whiteColor] forKey:NSForegroundColorAttributeName];
		appearance.largeTitleTextAttributes = [NSDictionary dictionaryWithObject:[UIColor whiteColor] forKey:NSForegroundColorAttributeName];
		
		self.navigationController.navigationBar.scrollEdgeAppearance = appearance;
		self.navigationController.navigationBar.standardAppearance = appearance;
		self.navigationController.navigationBar.compactAppearance = appearance;
}


	UIColor *bgcolor = isWhite ? [UIColor whiteColor] : C_THEME_2;
UIColor *fontcolor = isWhite ? [UIColor blackColor] : [UIColor whiteColor];

self.navigationController.navigationBar.translucent = NO;
self.navigationController.navigationBar.shadowImage = [[UIImage alloc] init];
[self.navigationController setNeedsStatusBarAppearanceUpdate];
[self.navigationController.navigationBar setTintColor:fontcolor];

if (@available(iOS 13.0, *)) {
    UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc] init];
    [appearance configureWithOpaqueBackground];
    [appearance setBackgroundColor:bgcolor];
    [appearance setBackgroundEffect:nil];
    appearance.titleTextAttributes = [NSDictionary dictionaryWithObject:fontcolor forKey:NSForegroundColorAttributeName];
    appearance.largeTitleTextAttributes = [NSDictionary dictionaryWithObject:fontcolor forKey:NSForegroundColorAttributeName];
    
    self.navigationController.navigationBar.scrollEdgeAppearance = appearance;
    self.navigationController.navigationBar.standardAppearance = [appearance copy];
    self.navigationController.navigationBar.compactAppearance = [appearance copy];
    
    if (@available(iOS 15.0, *)) {
        self.navigationController.navigationBar.compactScrollEdgeAppearance = [appearance copy];
    }
} else {
    self.navigationController.navigationBar.barTintColor = bgcolor;//#2266EF;
    self.navigationController.navigationBar.backgroundColor = bgcolor;
    self.navigationController.navigationBar.titleTextAttributes = [NSDictionary dictionaryWithObject:fontcolor forKey:NSForegroundColorAttributeName];
    self.navigationController.navigationBar.tintColor = fontcolor;
}

###

- (void)hiddenNavigationBarUnderImageView:(BOOL)isHidden {
if (!self.navigationController || !self.navigationController.navigationBar) {
    return;
}

UIImageView *underImageview = [self findNavigationBarUnderImageView:self.navigationController.navigationBar];
if (underImageview)
    underImageview.hidden = isHidden;
	}

	- (UIImageView *)findNavigationBarUnderImageView:(UIView *)view {
			if ([view isKindOfClass:UIImageView.class] && view.bounds.size.height <= 1.0) {
					return (UIImageView *)view;
			}
			
			for (UIView *subview in view.subviews) {
					UIImageView *imageView = [self findNavigationBarUnderImageView:subview];
					if (imageView) {
							return imageView;
					}
			}
			return nil;
	}

Reference

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