Xcode-Swift; 向啟動屏幕添加聲音效果

Question

只是很快，我想詢問一個小問題，我想在我的swift應用程序的啟動屏幕中播放聲音效果。 關於在哪里聲明我的AVAudio播放器（在我的視圖控制器或Appdelegate中）的含義，我更加困惑。 但兩種方法都沒有成功。 這是我目前在我的appDelegate文件中得到的

import UIKit
import AVFoundation

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    var audioPlayer = AVAudioPlayer()

        func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
            // Override point for customization after application launch.

            self.window = UIWindow(frame: UIScreen.main.bounds)
            self.window!.backgroundColor = UIColor(red: 9/255, green: 4/255, blue: 68/255, alpha: 1)
            self.window!.makeKeyAndVisible()

            // rootViewController from StoryBoard
            let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
            let navigationController = mainStoryboard.instantiateViewController(withIdentifier: "navigationController")
            self.window!.rootViewController = navigationController

            // logo mask
            navigationController.view.layer.mask = CALayer()
            navigationController.view.layer.mask!.contents = UIImage(named: "logo.png")!.cgImage
            navigationController.view.layer.mask!.bounds = CGRect(x: 0, y: 0, width: 60, height: 60)
            navigationController.view.layer.mask!.anchorPoint = CGPoint(x: 0.5, y: 0.5)
            navigationController.view.layer.mask!.position = CGPoint(x: navigationController.view.frame.width / 2, y: navigationController.view.frame.height / 2)

            // logo mask background view
            let maskBgView = UIView(frame: navigationController.view.frame)
            maskBgView.backgroundColor = UIColor.white
            navigationController.view.addSubview(maskBgView)
            navigationController.view.bringSubview(toFront: maskBgView)

            // logo mask animation
            let transformAnimation = CAKeyframeAnimation(keyPath: "bounds")
            transformAnimation.delegate = self as? CAAnimationDelegate
            transformAnimation.duration = 1
            transformAnimation.beginTime = CACurrentMediaTime() + 1 //add delay of 1 second
            let initalBounds = NSValue(cgRect: (navigationController.view.layer.mask!.bounds))
            let secondBounds = NSValue(cgRect: CGRect(x: 0, y: 0, width: 50, height: 50))
            let finalBounds = NSValue(cgRect: CGRect(x: 0, y: 0, width: 2000, height: 2000))
            transformAnimation.values = [initalBounds, secondBounds, finalBounds]
            transformAnimation.keyTimes = [0, 0.5, 1]
            transformAnimation.timingFunctions = [CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut), CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseOut)]
            transformAnimation.isRemovedOnCompletion = false
            transformAnimation.fillMode = kCAFillModeForwards
            navigationController.view.layer.mask!.add(transformAnimation, forKey: "maskAnimation")

            // logo mask background view animation
            UIView.animate(withDuration: 0.1,
                           delay: 1.35,
                           options: UIViewAnimationOptions.curveEaseIn,
                           animations: {
                            maskBgView.alpha = 0.0
            },
                           completion: { finished in
                            maskBgView.removeFromSuperview()
            })

            // root view animation
            UIView.animate(withDuration: 0.25,
                           delay: 1.3,
                           options: UIViewAnimationOptions(),
                           animations: {
                            self.window!.rootViewController!.view.transform = CGAffineTransform(scaleX: 1.05, y: 1.05)
            },
                           completion: { finished in
                            UIView.animate(withDuration: 0.3,
                                           delay: 0.0,
                                           options: UIViewAnimationOptions(),
                                           animations: {
                                            self.window!.rootViewController!.view.transform = CGAffineTransform.identity
                            },
                                           completion: nil
                            )

                            do {
                                self.audioPlayer = try AVAudioPlayer(contentsOf: URL.init(fileURLWithPath: Bundle.main.path(forResource: "startup", ofType: "wav")!))
                                self.audioPlayer.prepareToPlay()
                            }
                            catch {
                                print(error)
                            }
            })

            return true

    }



    func applicationWillResignActive(_ application: UIApplication) {
        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
        // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
    }

    func applicationDidEnterBackground(_ application: UIApplication) {
        // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
        // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
    }

    func applicationWillEnterForeground(_ application: UIApplication) {
        // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
    }

    func applicationDidBecomeActive(_ application: UIApplication) {
        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    }

    func applicationWillTerminate(_ application: UIApplication) {
        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
    }


}

Answer 1

我更喜歡使用的方法是聲明

var audioPlayer = AVAudioPlayer()

在AppDelegate中（就像在代碼中一樣）。

並有一種播放音頻的方法

func playSound(file:String, ext:String) -> Void {
    do {
        let url = URL.init(fileURLWithPath: Bundle.main.path(forResource: file, ofType: ext)!)
        audioPlayer = try AVAudioPlayer(contentsOf: url)
        audioPlayer.prepareToPlay()
        audioPlayer.play()
    } catch let error {
        NSLog(error.localizedDescription)
    }
}

這樣你可以打電話

playSound(file: "startup", ext: "wav")

可以在您的應用程序中隨時隨地播放此聲音（以及其他聲音），同時減少代碼重復。

Answer 2

我想在啟動時進行一次握手呼叫時遇到了類似的問題。 但是根據Apple UX，用戶應該能夠盡快上岸。

啟動屏幕之前會准備好視圖和應用程序。 我們無法控制它。 但是，如果我們不執行着陸視圖控制器中的繁重任務或在單獨的線程中執行此任務，則可以減少啟動屏幕的時間。 這樣可以減少啟動屏幕的時間。

要實現這種音效，您可以制作一個初始VC，並調用與啟動屏幕相同的UI進行復制，以使過渡不會可見。 在這里，您可以在viewDidLoad()或viewDidAppear(animated:Bool)執行音頻操作