等待ios speechSynthesizer.speak完成发声

import AVFoundation

class ViewController: UIViewController, AVSpeechSynthesizerDelegate {
    let speechSynthesizer = AVSpeechSynthesizer()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        speechSynthesizer.delegate = self
    }
    
    func speakText(text: String) {
        let speechUtterance = AVSpeechUtterance(string: text)
        speechSynthesizer.speak(speechUtterance)
    }
    
    // AVSpeechSynthesizerDelegate方法
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didFinish utterance: AVSpeechUtterance) {
        // 合成完成后的操作
    }
}

import AVFoundation

class ViewController: UIViewController {
    let speechSynthesizer = AVSpeechSynthesizer()
    
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    
    func speakText(text: String, completion: @escaping () -> Void) {
        let speechUtterance = AVSpeechUtterance(string: text)
        speechSynthesizer.speak(speechUtterance)
        
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
            completion()
        }
    }
}