語音合成在iOS上裝載奇怪的錯誤，並沒有併發

Question

我使用AVFoundation語音合成器，創建這樣的聲音的一個實例：

import AVFoundation 

class CanSpeak { 

    let voices = AVSpeechSynthesisVoice.speechVoices() 
    let voiceSynth = AVSpeechSynthesizer() 
    var voiceToUse: AVSpeechSynthesisVoice? 

    init(){ 
     for voice in voices { 
      if voice.name == "Arthur" 
      { 
       voiceToUse = voice 
      } 
     } 
    } 

    func sayThis(_ phrase: String){ 
     let utterance = AVSpeechUtterance(string: phrase) 
     utterance.voice = voiceToUse 
     utterance.rate = 0.5 
     voiceSynth.speak(utterance) 
    } 
} 

我有兩個問題。

1. 沒有併發性。多次調用此函數會導致字符串的排隊。我不想那樣。如果有多次打電話給這個功能，我想要立即開始說話，即使這意味着自己說話。我如何做到這一點？

2 - 一些奇怪的錯誤，我不上裝載明白：

2016-11-18 03:03:07.103349 mySKtest[687:87489] 0x17415ee50 Copy matching assets reply: XPC_TYPE_DICTIONARY { count = 2, transaction: 0, voucher = 0x0, contents = "Assets" => : { length = 3620 bytes, contents = 0x62706c6973743030d4000100020003000400050006012d01... } "Result" => : 0 } 2016-11-18 03:03:07.109254 mySKtest[687:87489] 0x17015e610 Copy assets attributes reply: XPC_TYPE_DICTIONARY { count = 1, transaction: 0, voucher = 0x0, contents = "Result" => : 1 } 2016-11-18 03:03:07.109547 mySKtest[687:87489] [MobileAssetError:1] Unable to copy asset attributes 2016-11-18 03:03:07.110080 mySKtest[687:87489] Could not get attribute 'LocalURL': Error Domain=MobileAssetError Code=1 "Unable to copy asset attributes" UserInfo={NSDescription=Unable to copy asset attributes} 2016-11-18 03:03:07.112341 mySKtest[687:87489] 0x17015e610 Copy assets attributes reply: XPC_TYPE_DICTIONARY { count = 1, transaction: 0, voucher = 0x0, contents = "Result" => : 1 } 2016-11-18 03:03:07.112416 mySKtest[687:87489] [MobileAssetError:1] Unable to copy asset attributes 2016-11-18 03:03:07.112523 mySKtest[687:87489] Could not get attribute 'LocalURL': Error Domain=MobileAssetError Code=1 "Unable to copy asset attributes" UserInfo={NSDescription=Unable to copy asset attributes} 2016-11-18 03:03:07.145658 mySKtest[687:87489] 0x174341c30 Copy matching assets reply: XPC_TYPE_DICTIONARY { count = 2, transaction: 0, voucher = 0x0, contents = "Assets" => : { length = 4198 bytes, contents = 0x62706c6973743030d4000100020003000400050006016f01... } "Result" => : 0 } 2016-11-18 03:03:07.148403 mySKtest[687:87489] 0x17015e610 Copy assets attributes reply: XPC_TYPE_DICTIONARY { count = 3, transaction: 0, voucher = 0x0, contents = "Attributes" => : { length = 526 bytes, contents = 0x62706c6973743030d4010203040506232458247665727369... } "Result" => : 0 "SandboxExtension" => { length = 269, contents = "b72954a376beb759be03a6411c3e2649f9845fd1;00000000;00000000;0000000000000015;com.apple.assets.read;00000001;01000003;00000000000ca4fc;/private/var/MobileAsset/Assets/com_apple_MobileAsset_VoiceServices_CustomVoice/54ffb86ce0ecd2c5bf871303b5690d327a571428.asset/AssetData" } } 2016-11-18 03:03:07.149858 mySKtest[687:87489] 0x1743414a0 Copy assets attributes reply: XPC_TYPE_DICTIONARY { count = 2, transaction: 0, voucher = 0x0, contents = "Attributes" => : { length = 526 bytes, contents = 0x62706c6973743030d4010203040506232458247665727369... } "Result" => : 0 }

Answer 1

至於＃1，它可能不會發生的。語音合成器是一個系統共享資源，因此係統如何處理調度多個請求不在我們的控制範圍之內，因爲它是API的客戶端。 （請注意，如果您重複使用相同的合成器，它會排隊多餘的話語，但是如果您創建多個合成器，則無法說出另一個合成器發聲時請求的話語。）

不知道關於＃2，抱歉。看起來像診斷文本，不一定是錯誤。可能價值filing a bug，因爲他們可能不希望在沒有實際問題時進行日誌診斷。

獎金回答：您可以使用函數編程，使聲音有點短的選擇：

let voice = AVSpeechSynthesisVoice.speechVoices().first(where: { $0.name == "Arthur" })