一个大的猫窝,voidcat

    if (@available(iOS 13.0, *)) {
        UINavigationBarAppearance *appearance = [UINavigationBarAppearance new];
        appearance.shadowImage = [UIImage imageWithColor:KWhiteColor];
        [appearance configureWithOpaqueBackground];
        appearance.backgroundColor =  KWhiteColor;
        
        nav.navigationBar.standardAppearance = appearance;
        nav.navigationBar.scrollEdgeAppearance = appearance;
        [nav.navigationBar setShadowImage:nil];
        [nav.navigationBar setShadowImage:[UIImage imageWithColor:KWhiteColor]];
        
        [nav.navigationBar setBackgroundImage:       [UIImage imageWithColor:KWhiteColor] forBarMetrics:UIBarMetricsDefault];
        
        
    } else {
        // Fallback on earlier versions
    }

//全局设置   
 if (@available(iOS 13.0, *)) {
        UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc] init];
        [appearance configureWithOpaqueBackground];
        appearance.backgroundColor = kWhiteColor;

        [[UINavigationBar appearance] setStandardAppearance:appearance];
        [[UINavigationBar appearance] setScrollEdgeAppearance:appearance];
    } else {
        // Fallback on earlier versions
        [[UINavigationBar appearance] setBarTintColor:kWhiteColor];
        [[UINavigationBar appearance] setTranslucent:NO];
    }