启动时的向导页（新手引导）的制作

import UIKit
 
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
 
    var window: UIWindow?
 
    func application(_ application: UIApplication, didFinishLaunchingWithOptions
        launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        //增加标识，用于判断是否是第一次启动应用...
        if (!(UserDefaults.standard.bool(forKey: "everLaunched"))) {
            UserDefaults.standard.set(true, forKey:"everLaunched")
            let guideViewController = GuideViewController()
            self.window!.rootViewController=guideViewController;
            print("guideview launched!")
        }
        return true
    }
 
    func applicationWillResignActive(_ application: UIApplication) {
    }
 
    func applicationDidEnterBackground(_ application: UIApplication) {
    }
 
    func applicationWillEnterForeground(_ application: UIApplication) {
    }
 
    func applicationDidBecomeActive(_ application: UIApplication) {
    }
 
    func applicationWillTerminate(_ application: UIApplication) {
    }
}

import UIKit
 
class GuideViewController:UIViewController,UIScrollViewDelegate
{
    //页面数量
    var numOfPages = 3
     
    override func viewDidLoad()
    {
        let frame = self.view.bounds
        //scrollView的初始化
        let scrollView = UIScrollView()
        scrollView.frame = self.view.bounds
        scrollView.delegate = self
        //为了能让内容横向滚动，设置横向内容宽度为3个页面的宽度总和
        scrollView.contentSize = CGSize(width:frame.size.width * CGFloat(numOfPages),
                                        height:frame.size.height)
        print("\(frame.size.width*CGFloat(numOfPages)),\(frame.size.height)")
        scrollView.isPagingEnabled = true
        scrollView.showsHorizontalScrollIndicator = false
        scrollView.showsVerticalScrollIndicator = false
        scrollView.scrollsToTop = false
        for i in 0.. twidth)
        {
            let mainStoryboard = UIStoryboard(name:"Main", bundle:nil)
            let viewController = mainStoryboard.instantiateInitialViewController()
            self.present(viewController!, animated: true, completion:nil)
        }
    }
}