相关疑难解决方法(0)

因为我的构建机器仍在使用 Xcode 12.5 ，所以 UITabBar 的scrollEdgeAppearance（在 Xcode 12.5 的 SDK 中不存在）将使构建失败，即使我使用 @available 来检查。

if (@available(iOS 15.0, *)) {
    UINavigationBarAppearance* navBarAppearance = [UINavigationBarAppearance new];
    navBarAppearance.backgroundColor = [UIColor colorNamed:@"navbar_bg"];

    [UINavigationBar appearance].standardAppearance = navBarAppearance;
    [UINavigationBar appearance].scrollEdgeAppearance = navBarAppearance;
    
    UITabBarAppearance* tabBarAppearance = [UITabBarAppearance new];
    tabBarAppearance.backgroundColor = [UIColor colorNamed:@"second_bg"];
    [UITabBar appearance].standardAppearance = tabBarAppearance;
    [UITabBar appearance].scrollEdgeAppearance = tabBarAppearance;
    
    [UITableView appearance].sectionHeaderTopPadding = 0;
}

那么是否可以在代码中做这种SDK签入，当构建的SDK不是最新的SDK时，这些代码就不会参与构建呢？像这样

if (BuilDSDK >= someversion) 
{
   [UITabBar appearance].scrollEdgeAppearance = tabBarAppearance;
}