快速入门:在 iOS 上使用语音 SDK 通过 Swift 合成语音Quickstart: Synthesize speech in Swift on iOS using the Speech SDK

在本文中,你将学习如何使用认知服务语音 SDK 从文本合成语音,从而通过 Swift 创建 iOS 应用。In this article, you learn how to create a iOS app in Swift using the Cognitive Services Speech SDK to synthesize speech from text.

先决条件Prerequisites

在开始之前,请满足以下一系列先决条件:Before you get started, here's a list of prerequisites:

获取用于 iOS 的语音 SDKGet the Speech SDK for iOS

重要

下载任何 Azure 认知服务语音 SDK,即表示你已确认接受其许可条款。By downloading any of the Azure Cognitive Services Speech SDKs, you acknowledge its license. 有关详细信息,请参阅:For more information, see:

适用于 iOS 的认知服务语音 SDK 目前以框架捆绑包的形式分发。The Cognitive Services Speech SDK for iOS is distributed as a framework bundle. 可在 Xcode 项目将它作为 CocoaPod 使用,或者从 https://aka.ms/csspeech/macosbinary 下载,然后手动与它建立链接。It can be used in Xcode projects as a CocoaPod, or downloaded from https://aka.ms/csspeech/macosbinary and linked manually. 本指南使用 CocoaPod。This guide uses a CocoaPod.

创建 Xcode 项目Create an Xcode project

启动 Xcode,然后通过单击“文件” > “新建” > “项目”来启动新项目。Start Xcode, and start a new project by clicking File > New > Project. 在模板选择对话框中,选择“iOS 单一视图应用”模板。In the template selection dialog, choose the "iOS Single View App" template.

在随后的对话框中,进行以下选择:In the dialogs that follow, make the following selections:

  1. 项目选项对话框Project Options Dialog
    1. 为快速入门应用输入一个名称,例如 helloworldEnter a name for the quickstart app, for example helloworld.
    2. 如果已经有 Apple 开发人员帐户,请输入相应的组织名称和组织标识符。Enter an appropriate organization name and an organization identifier, if you already have an Apple developer account. 可以直接选取任意名称(例如 testorg)进行测试。For testing purposes, you can just pick any name like testorg. 若要对应用进行签名,需要适当的预配配置文件。To sign the app, you need a proper provisioning profile. 有关详细信息,请参阅 Apple 开发人员站点Refer to the Apple developer site for details.
    3. 确保选择 Swift 作为项目的语言。Make sure Swift is chosen as the language for the project.
    4. 禁用使用情节提要和创建基于文档的应用程序的复选框。Disable the checkboxes to use storyboards and to create a document-based application. 将以编程方式创建示例应用的简单 UI。The simple UI for the sample app will be created programmatically.
    5. 禁用所有用于测试和核心数据的复选框。Disable all checkboxes for tests and core data.
  2. 选择项目目录Select project directory
    1. 选择用于放置该项目的目录。Choose a directory to put the project in. 这样会在所选目录中创建一个 helloworld 目录,其中包含 Xcode 项目的所有文件。This creates a helloworld directory in the chosen directory that contains all the files for the Xcode project.
    2. 禁止创建适用于此示例项目的 Git 存储库。Disable the creation of a Git repo for this example project.
  3. 关闭 Xcode 项目。Close the Xcode project. 稍后在设置 CocoaPods 后,将使用该项目的另一个实例。You will use a different instance of it later after setting up the CocoaPods.

添加示例代码Add the sample code

  1. 将名为 MicrosoftCognitiveServicesSpeech-Bridging-Header.h 的新头文件放置到 helloworld 项目内的 helloworld 目录中,并将以下代码粘贴到其中:Place a new header file with the name MicrosoftCognitiveServicesSpeech-Bridging-Header.h into the helloworld directory inside the helloworld project, and paste the following code into it:

    #ifndef MicrosoftCognitiveServicesSpeech_Bridging_Header_h
    #define MicrosoftCognitiveServicesSpeech_Bridging_Header_h
    
    #import <MicrosoftCognitiveServicesSpeech/SPXSpeechAPI.h>
    
    #endif /* MicrosoftCognitiveServicesSpeech_Bridging_Header_h */
    
  2. 在“Objective-C 桥接头文件”字段标头属性中,将桥接头文件的相对路径 helloworld/MicrosoftCognitiveServicesSpeech-Bridging-Header.h 添加到 helloworld 目标的 Swift 项目设置中Add the relative path helloworld/MicrosoftCognitiveServicesSpeech-Bridging-Header.h to the bridging header to the Swift project settings for the helloworld target in the Objective-C Bridging Header field Header properties

  3. 通过以下方式替换自动生成的 AppDelegate.swift 文件的内容:Replace the contents of the autogenerated AppDelegate.swift file by:

    import UIKit
    
    @UIApplicationMain
    class AppDelegate: UIResponder, UIApplicationDelegate {
    
        var window: UIWindow?
    
        func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
            window = UIWindow(frame: UIScreen.main.bounds)
    
            let homeViewController = ViewController()
            homeViewController.view.backgroundColor = UIColor.white
            window!.rootViewController = homeViewController
    
            window?.makeKeyAndVisible()
            return true
        }
    }
    
  4. 通过以下方式替换自动生成的 ViewController.swift 文件的内容:Replace the contents of the autogenerated ViewController.swift file by:

    import UIKit
    
    class ViewController: UIViewController, UITextFieldDelegate{
        var textField: UITextField!
        var synthesisButton: UIButton!
    
        var inputText: String!
    
        var host: String!
        var sub: String!
    
        override func viewDidLoad() {
            super.viewDidLoad()
    
            // load subscription information
            host = "https://YourServiceRegion.tts.speech.azure.cn/"
            sub = "YourSubscriptionKey"
    
            textField = UITextField(frame: CGRect(x: 100, y:250, width: 200, height: 50))
            textField.textColor = UIColor.black
            textField.borderStyle = UITextField.BorderStyle.roundedRect
            textField.placeholder = "Type something to synthesize."
            textField.delegate = self
    
            inputText = ""
    
            synthesisButton = UIButton(frame: CGRect(x: 100, y: 400, width: 200, height: 50))
            synthesisButton.setTitle("Synthesize", for: .normal)
            synthesisButton.addTarget(self, action:#selector(self.synthesisButtonClicked), for: .touchUpInside)
            synthesisButton.setTitleColor(UIColor.black, for: .normal)
    
            self.view.addSubview(textField)
            self.view.addSubview(synthesisButton)
        }
    
        func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
            if let text = textField.text,
            let textRange = Range(range, in: text) {
                self.inputText = text.replacingCharacters(in: textRange, with: string)
            }
            return true
        }
    
        @objc func synthesisButtonClicked() {
            DispatchQueue.global(qos: .userInitiated).async {
                self.synthesisToSpeaker()
            }
        }
    
        func synthesisToSpeaker() {
            var speechConfig: SPXSpeechConfiguration?
            do {
                try speechConfig = SPXSpeechConfiguration(host: host, subscription: sub)
            } catch {
                print("error \(error) happened")
                speechConfig = nil
            }
            let synthesizer = try! SPXSpeechSynthesizer(speechConfig!)
            if inputText.isEmpty {
                return
            }
            let result = try! synthesizer.speakText(inputText)
            if result.reason == SPXResultReason.canceled
            {
                let cancellationDetails = try! SPXSpeechSynthesisCancellationDetails(fromCanceledSynthesisResult: result)
                print("cancelled, detail: \(cancellationDetails.errorDetails!) ")
            }
        }
    }
    
  5. ViewController.swift 中,将字符串 YourSubscriptionKey 替换为你的订阅密钥。In ViewController.swift, replace the string YourSubscriptionKey with your subscription key.

  6. 将字符串 YourServiceRegion 替换为与订阅关联的区域(例如,对于试用订阅,为 chinaeast2)。Replace the string YourServiceRegion with the region associated with your subscription (for example, chinaeast2 for the trial subscription).

安装用作 CocoaPod 的 SDKInstall the SDK as a CocoaPod

  1. 根据安装说明中所述,安装 CocoaPod 依赖项管理器。Install the CocoaPod dependency manager as described in its installation instructions.

  2. 导航到示例应用所在的目录 (helloworld)。Navigate to the directory of your sample app (helloworld). 在该目录中添加一个包含以下内容的名为 Podfile 的文本文件:Place a text file with the name Podfile and the following content in that directory:

    target 'helloworld' do
        platform :ios, '9.3'
        pod 'MicrosoftCognitiveServicesSpeech-iOS', '~> 1.7'
        use_frameworks!
    end
    
  3. 在终端中导航到 helloworld 目录并运行命令 pod installNavigate to the helloworld directory in a terminal and run the command pod install. 这会生成一个 helloworld.xcworkspace Xcode 工作区,其中包含示例应用以及用作依赖项的语音 SDK。This will generate a helloworld.xcworkspace Xcode workspace containing both the sample app and the Speech SDK as a dependency. 在后续步骤中将使用此工作区。This workspace will be used in the following.

生成并运行示例Build and run the sample

  1. 在 Xcode 中打开 helloworld.xcworkspace 工作区。Open the helloworld.xcworkspace workspace in Xcode.
  2. 使调试输出可见(“视图” > “调试区域” > “激活控制台”)。Make the debug output visible (View > Debug Area > Activate Console).
  3. 从“产品” > “目标”菜单中的列表中,选择 iOS 模拟器或连接到开发计算机的 iOS 设备作为应用的目标位置 。Choose either the iOS simulator or an iOS device connected to your development machine as the destination for the app from the list in the Product > Destination menu.
  4. 在 iOS 模拟器中生成并运行示例代码,方法是在菜单中选择“产品” > “运行”,或者单击“播放”按钮。Build and run the example code in the iOS simulator by selecting Product > Run from the menu or clicking the Play button.
  5. 在输入一些文本并单击应用中的按钮后,你应该会听到播放的合成音频。After you input some text and click the button in the app, you should hear the synthesized audio played.

后续步骤Next steps