Question

我试图将语音识别代码转换为Swift，ViewController.h中定义的协议为：

@interface ViewController : UIViewController<SpeechRecognitionProtocol>
{
    NSMutableString* textOnScreen;
    DataRecognitionClient* dataClient;
    MicrophoneRecognitionClient* micClient;
    SpeechRecognitionMode recoMode;
    bool isMicrophoneReco;
    bool isIntent;
    int waitSeconds;
}

我在ViewController.h的下面转换了函数：

micClient = [SpeechRecognitionServiceFactory createMicrophoneClient:(recoMode)
                                                       withLanguage:(language)
                                               withKey:(primaryOrSecondaryKey)
                                                          withProtocol:(self)];

此功能在SpeechSDK.framework中定义为：

@interface SpeechRecognitionServiceFactory : NSObject
/*
@param delegate The protocol used to perform the callbacks/events upon during speech recognition.
*/
+(MicrophoneRecognitionClient*)createMicrophoneClient:(SpeechRecognitionMode)speechRecognitionMode
                              withLanguage:(NSString*)language
                              withKey:(NSString*)primaryOrSecondaryKey
                              withProtocol:(id<SpeechRecognitionProtocol>)delegate;
@end

这个协议在我转换的ViewController.Swift中看起来像这样：

import UIKit    
protocol SpeechRecognitionProtocol {
    func onIntentReceived(result: IntentResult)
    func onPartialResponseReceived(response: String)
    func onFinalResponseReceived(response: RecognitionResult)
    func onError(errorMessage: String, withErrorCode errorCode: Int)
    func onMicrophoneStatus(recording: DarwinBoolean)
    func initializeRecoClient()
}

class ViewController: UIViewController, SpeechRecognitionProtocol {
    var myDelegate: SpeechRecognitionProtocol?

最后我在ViewController.swift中调用了这个函数。在withProtocol之后我收到以下错误：无法转换类型＆＃39; SpeechRecognitionProtocol.Protocol＆＃39;预期参数类型＆＃39; SpeechRecognitionProtocol！＆＃39; ：

func initializeRecoClient() {
    let language: String = "en-us"
    let path: String = NSBundle.mainBundle().pathForResource("settings", ofType: "plist")!
    let settings = NSDictionary(contentsOfFile: path)
    let primaryOrSecondaryKey = settings?.objectForKey("primaryKey") as! String

    micClient = SpeechRecognitionServiceFactory.createMicrophoneClient(recoMode!,
                                               withLanguage: language, 
                                       withKey: primaryOrSecondaryKey,
                                withProtocol: SpeechRecognitionProtocol)
}

Answer 1

您不应该自己声明SpeechRecognitionProtocol（不确定您是仅为了演示目的而添加此内容，还是在代码中实际拥有此内容）。 SpeechRecognitionProtocol已在SpeechRecognitionService.h中声明并可供Swift使用 - 这是您需要使用的。

实现该协议的对象是ViewController。假设您的initializeRecoClient是该类的方法，则调用需要如下所示：

micClient = SpeechRecognitionServiceFactory
              .createMicrophoneClient(recoMode!,
                                      withLanguage: language, 
                                      withKey: primaryOrSecondaryKey,
                                      withProtocol: self)

SpeechSDK API没有为该工厂方法选择一个特别好的名称。 withProtocol参数不接受协议对象本身（顾名思义），而是实现协议的对象（显然）。

P.S。：不确定您使用的SpeechAPI版本，我必须实现这些Swift方法以使ViewController符合SpeechRecognitionProtocol：

func onPartialResponseReceived(response: String!) {}
func onFinalResponseReceived  (response: RecognitionResult) {}
func onError                  (errorMessage: String!, 
                               withErrorCode errorCode: Int32) {}
func onMicrophoneStatus       (recording: Bool) {}
func onIntentReceived         (result: IntentResult) {}

将Objective-C转换为Swift时如何处理Protocol Delegate

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