iOS15适配

导航栏

if #available(iOS 15.0, *) {
     //UINavigationBarAppearance属性从iOS13开始
      let navBarAppearance = UINavigationBarAppearance()
      // 背景色
      navBarAppearance.backgroundColor = UIColor.clear
      // 去掉半透明效果
      navBarAppearance.backgroundEffect = nil
      // 去除导航栏阴影（如果不设置clear，导航栏底下会有一条阴影线）
      navBarAppearance.shadowColor = UIColor.clear
      // 字体颜色
      navBarAppearance.titleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.white]
      self.navigationController?.navigationBar.scrollEdgeAppearance = navBarAppearance
}

if #available(iOS 15, *) {
    let bar = UITabBarAppearance.init()
    bar.backgroundColor = UIColor.white
    bar.shadowImage = UIColor.init(0xEEEEEE).image
    let selTitleAttr = [
        NSAttributedString.Key.font: itemFont,
        NSAttributedString.Key.foregroundColor: UIColor.theme
    ]
    bar.stackedLayoutAppearance.selected.titleTextAttributes = selTitleAttr // 设置选中attributes
    self.tabBar.scrollEdgeAppearance = bar
    self.tabBar.standardAppearance = bar
}

UITableView

    UITableView.appearance.sectionHeaderTopPadding = 0;
    UITableView.appearance.fillerRowHeight = 0;