Added completion handler to notify when utterance complete

SpeechSynthesizer.h

@@ -4,4 +4,8 @@
 
 @interface SpeechSynthesizer : NSObject <RCTBridgeModule, AVSpeechSynthesizerDelegate>
 @property (nonatomic, strong) AVSpeechSynthesizer *synthesizer;
+@property (nonatomic) RCTResponseSenderBlock cb;
+
+
+
 @end

SpeechSynthesizer.ios.js

@@ -13,9 +13,9 @@ var NativeSpeechSynthesizer = NativeModules.SpeechSynthesizer;
  */
 
 var SpeechSynthesizer = {
-  speak(options) {
-    return new Promise(function(resolve, reject) {
-      NativeSpeechSynthesizer.speakUtterance(options, function(error, success) {
+  speak(options: { [string]: string | number }) {
+    return new Promise(function (resolve, reject) {
+      NativeSpeechSynthesizer.speakUtterance(options, function (error, success) {
         if (error) {
           return reject(error);
         }
@@ -25,15 +25,26 @@ var SpeechSynthesizer = {
     });
   },
 
+  speakWithFinish(options: { [string]: string | number }) {
+    return new Promise(function (resolve, reject) {
+      NativeSpeechSynthesizer.speakUtteranceWithFinish(options, function (error, success) {
+        if (error) {
+          return reject(error);
+        }
+        resolve(true);
+      });
+    });
+  },
+
   stop: NativeSpeechSynthesizer.stopSpeakingAtBoundary,
 
   pause: NativeSpeechSynthesizer.pauseSpeakingAtBoundary,
 
   resume: NativeSpeechSynthesizer.continueSpeakingAtBoundary,
 
   isPaused() {
-    return new Promise(function(resolve, reject) {
-      NativeSpeechSynthesizer.paused(function(error, paused) {
+    return new Promise(function (resolve, reject) {
+      NativeSpeechSynthesizer.paused(function (error, paused) {
         if (error) {
           return reject(error);
         }
@@ -48,8 +59,8 @@ var SpeechSynthesizer = {
   },
 
   isSpeaking() {
-    return new Promise(function(resolve, reject) {
-      NativeSpeechSynthesizer.speaking(function(error, speaking) {
+    return new Promise(function (resolve, reject) {
+      NativeSpeechSynthesizer.speaking(function (error, speaking) {
         if (error) {
           return reject(error);
         }
@@ -64,8 +75,8 @@ var SpeechSynthesizer = {
   },
 
   supportedVoices() {
-    return new Promise(function(resolve, reject) {
-      NativeSpeechSynthesizer.speechVoices(function(error, locales) {
+    return new Promise(function (resolve, reject) {
+      NativeSpeechSynthesizer.speechVoices(function (error, locales) {
         if (error) {
           return reject(error);
         }

SpeechSynthesizer.m

@@ -56,6 +56,56 @@ @implementation SpeechSynthesizer
     callback(@[[NSNull null], @true]);
 }
 
+// SpeakWithFinish
+RCT_EXPORT_METHOD(speakUtteranceWithFinish:(NSDictionary *)args callback:(RCTResponseSenderBlock)callback)
+{
+    // Error if self.synthesizer was already initialized
+    if (self.synthesizer || self.cb) {
+        return callback(@[RCTMakeError(@"There is a speech in progress.  Use the `paused` method to know if it's paused.", nil, nil)]);
+    }
+
+    self.cb = callback;
+
+    // Set args to variables
+    NSString *text = args[@"text"];
+    NSString *voice = args[@"voice"];
+    NSNumber *rate = args[@"rate"];
+
+    // Error if no text is passed
+    if (!text) {
+        RCTLogError(@"[Speech] You must specify a text to speak.");
+        return;
+    }
+
+    // Set default voice
+    NSString *voiceLanguage;
+
+    // Set voice if provided
+    if (voice) {
+        voiceLanguage = voice;
+
+        // Fallback to en-US
+    } else {
+        voiceLanguage = @"en-US";
+    }
+
+    // Setup utterance and voice
+    AVSpeechUtterance *utterance = [[AVSpeechUtterance alloc] initWithString:text];
+
+    utterance.voice = [AVSpeechSynthesisVoice voiceWithLanguage:voiceLanguage];
+
+    if (rate) {
+        utterance.rate = [rate doubleValue];
+    }
+
+    self.synthesizer = [[AVSpeechSynthesizer alloc] init];
+    self.synthesizer.delegate = self;
+
+    // Speak
+    [self.synthesizer speakUtterance:utterance];
+}
+
+
 // Stops synthesizer
 RCT_EXPORT_METHOD(stopSpeakingAtBoundary)
 {
@@ -116,6 +166,12 @@ -(void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didFinishSpeechUtter
 {
     NSLog(@"Speech finished");
     self.synthesizer = nil;
+
+    if (self.cb) {
+        // Return that the speach has started
+        self.cb(@[[NSNull null], @true]);
+        self.cb = nil;
+    }
 }
 
 // Started Handler