因此,更新到 Xcode 12.0.1 后,AVSpeechSynthesizer 现在可以在模拟器上运行(它已经有一段时间没有为我工作了)。现在,无论合成器是否正在说话,isSpeaking 变量始终为 false。我想根据合成器是否在说话来触发我的观点发生变化。下面的简单版本,有什么想法吗?
import SwiftUI
import AVFoundation
struct ContentView: View {
var synthesizer = AVSpeechSynthesizer()
var utterance = AVSpeechUtterance(string: "Hello World")
var body: some View {
VStack {
Text(synthesizer.isSpeaking ? "Speaking" : "Not Speaking")
Button(action: {synthesizer.speak(utterance)}) {
Text("Speak To Me")
}
}
}
}
它只是在你的情况下没有更新,因为synthesiser.isSpeaking
对于 SwiftUI 是不可观察到的。您必须使用视图模型类和委托回调来处理此状态更改
这是初始演示(您可以自己添加停止/暂停/继续操作)
class SpeachViewModel: NSObject, ObservableObject, AVSpeechSynthesizerDelegate {
@Published var isSpeaking = false
private var synthesizer = AVSpeechSynthesizer()
override init() {
super.init()
synthesizer.delegate = self
}
deinit {
synthesizer.delegate = nil
}
func speak(_ utterance: AVSpeechUtterance) {
self.synthesizer.speak(utterance)
}
// MARK: AVSpeechSynthesizerDelegate
internal func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didStart utterance: AVSpeechUtterance) {
self.isSpeaking = true
}
internal func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didFinish utterance: AVSpeechUtterance) {
self.isSpeaking = false
}
internal func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didPause utterance: AVSpeechUtterance) {
self.isSpeaking = false
}
internal func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didCancel utterance: AVSpeechUtterance) {
self.isSpeaking = false
}
internal func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didContinue utterance: AVSpeechUtterance) {
self.isSpeaking = true
}
}
struct ContentView: View {
@ObservedObject var vm = SpeachViewModel()
var utterance = AVSpeechUtterance(string: "Hello World")
var body: some View {
VStack {
Text(vm.isSpeaking ? "Speaking" : "Not Speaking")
Button(action: {vm.speak(utterance)}) {
Text("Speak To Me")
}
}
}
}
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