iOS 13以后, 无法直接去除tabbar上方的线条, 只能设置跟tabbar一样的样色,

iOS 13以后, 无法直接去除tabbar上方的线条, 只能设置跟tabbar一样的样色,

/// 修改线条的颜色
- (void)changeShadowImage{
  if (@available(iOS 13, *)) {
      UIColor *color = [UIColor whiteColor];
      UITabBarAppearance *appearance = [self.tabBar.standardAppearance copy];
      appearance.backgroundImage = [UIImage qmui_imageWithColor:color];
      appearance.shadowImage = [UIImage qmui_imageWithColor:color];
      appearance.shadowColor = color;
      // 重置背景和阴影为透明  如果设置了阴影效果则此代码需要去掉
      //        [appearance configureWithTransparentBackground];
      self.tabBar.standardAppearance = appearance;
      if (@available(iOS 15.0, *)) {
          self.tabBar.scrollEdgeAppearance = appearance;
      } else {
          // Fallback on earlier versions
      }
  } else {
      self.tabBar.backgroundImage = [UIImage new];
      self.tabBar.shadowImage = [UIImage new];
  }
}