SwiftUI中的Higlight语音发声

I don't succeed to highlight text utterance in SwiftUI. I've found examples of it only in UIKit.In UIKit it is supposed to be var label: UILabel!, but in SwiftUI label has to be String. I've tried to convert NSMutableAttributedString into String format, inside function, but it's complaining.How to work it out with String formats, so that it works in SwiftUI, too?import AVFoundationclass Speaker: NSObject { let synth = AVSpeechSynthesizer() var label: String // <- problem override init() { super.init() synth.delegate = self } func speak(_ string: String) { let utterance = AVSpeechUtterance(string: string) utterance.voice = AVSpeechSynthesisVoice(language: "en-GB") utterance.rate = 0.4 synth.speak(utterance) } // Functions to highlight text func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, willSpeakRangeOfSpeechString characterRange: NSRange, utterance: AVSpeechUtterance) { let mutableAttributedString = NSMutableAttributedString(string: utterance.speechString) mutableAttributedString.addAttribute(.foregroundColor, value: UIColor.red, range: characterRange) label.attributedText = mutableAttributedString } func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didFinish utterance: AVSpeechUtterance) { label.attributedText = NSAttributedString(string: utterance.speechString) }} 解决方案 I suggest you wrap UILabel in UIViewRepresentable so that you can keep using an attributed string like before:struct ContentView : View { @ObservedObject var speaker = Speaker() var body: some View { VStack { LabelRepresented(text: speaker.label) }.onAppear { speaker.speak("Hi. This is a test.") } }}struct LabelRepresented: UIViewRepresentable { var text : NSAttributedString? func makeUIView(context: Context) -> UILabel { return UILabel() } func updateUIView(_ uiView: UILabel, context: Context) { uiView.attributedText = text }}class Speaker: NSObject, ObservableObject, AVSpeechSynthesizerDelegate { let synth = AVSpeechSynthesizer() @Published var label: NSAttributedString? // <- change to AttributedString override init() { super.init() synth.delegate = self } func speak(_ string: String) { let utterance = AVSpeechUtterance(string: string) utterance.voice = AVSpeechSynthesisVoice(language: "en-GB") utterance.rate = 0.4 synth.speak(utterance) } // Functions to highlight text func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, willSpeakRangeOfSpeechString characterRange: NSRange, utterance: AVSpeechUtterance) { let mutableAttributedString = NSMutableAttributedString(string: utterance.speechString) mutableAttributedString.addAttribute(.foregroundColor, value: UIColor.red, range: characterRange) label = mutableAttributedString } func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didFinish utterance: AVSpeechUtterance) { label = NSAttributedString(string: utterance.speechString) }}I changed label into an NSAttributedString? and made it a @Published property on an ObservableObject -- that way, when it changes, the view gets notified right away.The UIViewRepresentable creates a label and updates it with the attributed string any time it changes.In the event that you did want to try a more pure SwiftUI approach, this blog posts has some good resources for using NSAttributedString in SwiftUI (including the approach I took): https://swiftui-lab.com/attributed-strings-with-swiftui/ 这篇关于SwiftUI中的Higlight语音发声的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！