實例分享iOS App初次啟動時的用戶引導頁的制作

2020-02-19 15:50:00

字體：大中小

來源：轉載

供稿：網友

應用程序一般有一個引導頁面，可以作為操作指南，引導用戶熟悉使用該產品，也可以向用戶顯示，讓用戶了解應用程序的功能，下面就請大家跟著武林技術頻道小編來共同學習吧！

下面我們來看具體的實例：

我們用NSUserDefaults類來判斷程序是不是第一次啟動或是否更新，在 AppDelegate.swift中加入以下代碼：

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

??? // 得到當前應用的版本號
??? let infoDictionary = NSBundle.mainBundle().infoDictionary
??? let currentAppVersion = infoDictionary!["CFBundleShortVersionString"] as! String

??? // 取出之前保存的版本號
??? let userDefaults = NSUserDefaults.standardUserDefaults()
??? let appVersion = userDefaults.stringForKey("appVersion")

??? let storyboard = UIStoryboard(name: "Main", bundle: nil)

??? // 如果 appVersion 為 nil 說明是第一次啟動；如果 appVersion 不等于 currentAppVersion 說明是更新了
??? if appVersion == nil || appVersion != currentAppVersion {
??????? // 保存最新的版本號
??????? userDefaults.setValue(currentAppVersion, forKey: "appVersion")

??????? let guideViewController = storyboard.instantiateViewControllerWithIdentifier("GuideViewController") as! GuideViewController
??????? self.window?.rootViewController = guideViewController
??? }

??? return true
}

在GuideViewController中，我們用UIScrollView來裝載我們的引導頁:

class GuideViewController: UIViewController {

??? @IBOutlet weak var pageControl: UIPageControl!
??? @IBOutlet weak var startButton: UIButton!

??? private var scrollView: UIScrollView!

??? private let numOfPages = 3

??? override func viewDidLoad() {
??????? super.viewDidLoad()

??????? let frame = self.view.bounds

??????? scrollView = UIScrollView(frame: frame)
??????? scrollView.pagingEnabled = true
??????? scrollView.showsHorizontalScrollIndicator = false
??????? scrollView.showsVerticalScrollIndicator = false
??????? scrollView.scrollsToTop = false
??????? scrollView.bounces = false
??????? scrollView.contentOffset = CGPointZero
??????? // 將 scrollView 的 contentSize 設為屏幕寬度的3倍(根據實際情況改變)
??????? scrollView.contentSize = CGSize(width: frame.size.width * CGFloat(numOfPages), height: frame.size.height)

??????? scrollView.delegate = self

??????? for index? in 0..<numOfPages {
??????????? // 這里注意圖片的命名
??????????? let imageView = UIImageView(image: UIImage(named: "GuideImage/(index + 1)"))
??????????? imageView.frame = CGRect(x: frame.size.width * CGFloat(index), y: 0, width: frame.size.width, height: frame.size.height)
??????????? scrollView.addSubview(imageView)
??????? }

??????? self.view.insertSubview(scrollView, atIndex: 0)

??????? // 給開始按鈕設置圓角
??????? startButton.layer.cornerRadius = 15.0
??????? // 隱藏開始按鈕
??????? startButton.alpha = 0.0
??? }

??? // 隱藏狀態欄
??? override func prefersStatusBarHidden() -> Bool {
??????? return true
??? }
}

最后我們讓GuideViewController遵循UIScrollViewDelegate協議，在這里判斷是否滑動到最后一張以顯示進入按鈕：

// MARK: - UIScrollViewDelegate
extension GuideViewController: UIScrollViewDelegate {
??? func scrollViewDidScroll(scrollView: UIScrollView) {
??????? let offset = scrollView.contentOffset
??????? // 隨著滑動改變pageControl的狀態
??????? pageControl.currentPage = Int(offset.x / view.bounds.width)

??????? // 因為currentPage是從0開始，所以numOfPages減1
??????? if pageControl.currentPage == numOfPages - 1 {
??????????? UIView.animateWithDuration(0.5) {
??????????????? self.startButton.alpha = 1.0
??????????? }
??????? } else {
??????????? UIView.animateWithDuration(0.2) {
??????????????? self.startButton.alpha = 0.0
??????????? }
??????? }
??? }
}

在上面的代碼中，為了顯得自然我們給進入按鈕加入了一點動畫 :]

最終效果如下：

20163991437107.gif (372×663)