AVSpeechSynthesizer change voice

As of Xcodee 8.3.2 a male voice now seems to be available

import UIKit
import AVFoundation

class ViewController: UIViewController {

    let speaker = AVSpeechSynthesizer()
    let dialogue = AVSpeechUtterance(string: "Hello I am clearly a man")

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func speakText(sender: AnyObject) {

        dialogue.rate = AVSpeechUtteranceDefaultSpeechRate;
        dialogue.voice = AVSpeechSynthesisVoice(language: "en-gb") 

        guard speaker.isSpeaking else
        {
            speaker.speak(dialogue)
            return
        }
    }
}

language en-gb speaks with a male voice

Cheers

You can use AVSpeechSynthesisVoice(identifier: "com.apple.ttsbundle.siri_male_en-GB_compact")

The identifiers can be found when you print AVSpeechSynthesisVoice.speechVoices()

[AVSpeechSynthesisVoice 0x6080000097d0] Language: ar-SA, Name: Maged, Quality: Default [com.apple.ttsbundle.Maged-compact]
[AVSpeechSynthesisVoice 0x608000009780] Language: cs-CZ, Name: Zuzana, Quality: Default [com.apple.ttsbundle.Zuzana-compact]
[AVSpeechSynthesisVoice 0x608000009440] Language: da-DK, Name: Sara, Quality: Default [com.apple.ttsbundle.Sara-compact]
[AVSpeechSynthesisVoice 0x608000009670] Language: de-DE, Name: Anna, Quality: Default [com.apple.ttsbundle.Anna-compact]
[AVSpeechSynthesisVoice 0x6080000092e0] Language: el-GR, Name: Melina, Quality: Default [com.apple.ttsbundle.Melina-compact]
[AVSpeechSynthesisVoice 0x608000009310] Language: en-AU, Name: Karen, Quality: Default [com.apple.ttsbundle.Karen-compact]
[AVSpeechSynthesisVoice 0x6080000098d0] Language: en-GB, Name: Daniel, Quality: Default [com.apple.ttsbundle.Daniel-compact]
[AVSpeechSynthesisVoice 0x6080000094e0] Language: en-IE, Name: Moira, Quality: Default [com.apple.ttsbundle.Moira-compact]
[AVSpeechSynthesisVoice 0x6080000096b0] Language: en-US, Name: Samantha, Quality: Default [com.apple.ttsbundle.Samantha-compact]
[AVSpeechSynthesisVoice 0x608000009480] Language: en-ZA, Name: Tessa, Quality: Default [com.apple.ttsbundle.Tessa-compact]
[AVSpeechSynthesisVoice 0x6080000093d0] Language: es-ES, Name: Monica, Quality: Default [com.apple.ttsbundle.Monica-compact]
[AVSpeechSynthesisVoice 0x6080000096c0] Language: es-MX, Name: Paulina, Quality: Default [com.apple.ttsbundle.Paulina-compact]
[AVSpeechSynthesisVoice 0x608000009550] Language: fi-FI, Name: Satu, Quality: Default [com.apple.ttsbundle.Satu-compact]
[AVSpeechSynthesisVoice 0x6080000094f0] Language: fr-CA, Name: Amelie, Quality: Default [com.apple.ttsbundle.Amelie-compact]
[AVSpeechSynthesisVoice 0x608000009880] Language: fr-FR, Name: Thomas, Quality: Default [com.apple.ttsbundle.Thomas-compact]
[AVSpeechSynthesisVoice 0x608000009290] Language: he-IL, Name: Carmit, Quality: Default [com.apple.ttsbundle.Carmit-compact]
[AVSpeechSynthesisVoice 0x608000009570] Language: hi-IN, Name: Lekha, Quality: Default [com.apple.ttsbundle.Lekha-compact]
[AVSpeechSynthesisVoice 0x608000009510] Language: hu-HU, Name: Mariska, Quality: Default [com.apple.ttsbundle.Mariska-compact]
[AVSpeechSynthesisVoice 0x608000009040] Language: id-ID, Name: Damayanti, Quality: Default [com.apple.ttsbundle.Damayanti-compact]
[AVSpeechSynthesisVoice 0x6080000096a0] Language: it-IT, Name: Alice, Quality: Default [com.apple.ttsbundle.Alice-compact]
[AVSpeechSynthesisVoice 0x6080000092b0] Language: ja-JP, Name: Kyoko, Quality: Default [com.apple.ttsbundle.Kyoko-compact]
[AVSpeechSynthesisVoice 0x608000009540] Language: ko-KR, Name: Yuna, Quality: Default [com.apple.ttsbundle.Yuna-compact]
[AVSpeechSynthesisVoice 0x6080000090e0] Language: nl-BE, Name: Ellen, Quality: Default [com.apple.ttsbundle.Ellen-compact]
[AVSpeechSynthesisVoice 0x608000009380] Language: nl-NL, Name: Xander, Quality: Default [com.apple.ttsbundle.Xander-compact]
[AVSpeechSynthesisVoice 0x608000009240] Language: no-NO, Name: Nora, Quality: Default [com.apple.ttsbundle.Nora-compact]
[AVSpeechSynthesisVoice 0x6080000090f0] Language: pl-PL, Name: Zosia, Quality: Default [com.apple.ttsbundle.Zosia-compact]
[AVSpeechSynthesisVoice 0x608000009250] Language: pt-BR, Name: Luciana, Quality: Default [com.apple.ttsbundle.Luciana-compact]
[AVSpeechSynthesisVoice 0x6080000094d0] Language: pt-PT, Name: Joana, Quality: Default [com.apple.ttsbundle.Joana-compact]
[AVSpeechSynthesisVoice 0x608000009210] Language: ro-RO, Name: Ioana, Quality: Default [com.apple.ttsbundle.Ioana-compact]
[AVSpeechSynthesisVoice 0x608000009130] Language: ru-RU, Name: Milena, Quality: Default [com.apple.ttsbundle.Milena-compact]
[AVSpeechSynthesisVoice 0x608000009620] Language: sk-SK, Name: Laura, Quality: Default [com.apple.ttsbundle.Laura-compact]
[AVSpeechSynthesisVoice 0x608000009730] Language: sv-SE, Name: Alva, Quality: Default [com.apple.ttsbundle.Alva-compact]
[AVSpeechSynthesisVoice 0x608000009740] Language: th-TH, Name: Kanya, Quality: Default [com.apple.ttsbundle.Kanya-compact]
[AVSpeechSynthesisVoice 0x6080000095e0] Language: tr-TR, Name: Yelda, Quality: Default [com.apple.ttsbundle.Yelda-compact]
[AVSpeechSynthesisVoice 0x608000009010] Language: zh-CN, Name: Ting-Ting, Quality: Default [com.apple.ttsbundle.Ting-Ting-compact]
[AVSpeechSynthesisVoice 0x608000009660] Language: zh-HK, Name: Sin-Ji, Quality: Default [com.apple.ttsbundle.Sin-Ji-compact]
[AVSpeechSynthesisVoice 0x608000009860] Language: zh-TW, Name: Mei-Jia, Quality: Default [com.apple.ttsbundle.Mei-Jia-compact]