Text-to-speech for iOS (#443)

ios-swiftui/SherpaOnnxTts/SherpaOnnxTts/ContentView.swift

@@ -0,0 +1,95 @@
+//
+//  ContentView.swift
+//  SherpaOnnxTts
+//
+//  Created by fangjun on 2023/11/23.
+//
+// Speech-to-text with Next-gen Kaldi on iOS without Internet connection
+
+import SwiftUI
+import AVFoundation
+
+struct ContentView: View {
+    @State private var sid = "0"
+    @State private var speed = 1.0
+    @State private var text = ""
+    @State private var showAlert = false
+    @State var filename: URL = NSURL() as URL
+    @State var audioPlayer: AVAudioPlayer!
+
+    private var tts = createOfflineTts()
+
+    var body: some View {
+
+        VStack(alignment: .leading) {
+            HStack {
+                Spacer()
+                Text("Next-gen Kaldi: TTS").font(.title)
+                Spacer()
+            }
+            HStack{
+                Text("Speaker ID")
+                TextField("Please input a speaker ID", text: $sid).textFieldStyle(.roundedBorder)
+                    .keyboardType(.numberPad)
+            }
+            HStack{
+                Text("Speed \(String(format: "%.1f", speed))")
+                    .padding(.trailing)
+                Slider(value: $speed, in: 0.5...2.0, step: 0.1) {
+                    Text("Speech speed")
+                }
+            }
+
+            Text("Please input your text below").padding([.trailing, .top, .bottom])
+
+            TextEditor(text: $text)
+                .font(.body)
+                .opacity(self.text.isEmpty ? 0.25 : 1)
+                .disableAutocorrection(true)
+                .border(Color.black)
+
+            Spacer()
+            HStack {
+                Spacer()
+                Button(action: {
+                    let speakerId = Int(self.sid) ?? 0
+                    let t = self.text.trimmingCharacters(in: .whitespacesAndNewlines)
+                    if t.isEmpty {
+                        self.showAlert = true
+                        return
+                    }
+
+                    let audio = tts.generate(text: t, sid: speakerId, speed: Float(self.speed))
+                    if self.filename.absoluteString.isEmpty {
+                        let tempDirectoryURL = NSURL.fileURL(withPath: NSTemporaryDirectory(), isDirectory: true)
+                        self.filename = tempDirectoryURL.appendingPathComponent("test.wav")
+                    }
+
+                    let ret = audio.save(filename: filename.path)
+
+                    self.audioPlayer = try! AVAudioPlayer(contentsOf: filename)
+                    self.audioPlayer.play()
+                }) {
+                    Text("Generate")
+                }.alert(isPresented: $showAlert) {
+                    Alert(title: Text("Empty text"), message: Text("Please input your text before clicking the Generate button"))
+                }
+                Spacer()
+                Button (action: {
+                    self.audioPlayer.play()
+                }) {
+                    Text("Play")
+                }.disabled(filename.absoluteString.isEmpty)
+                Spacer()
+            }
+            Spacer()
+        }
+        .padding()
+    }
+}
+
+struct ContentView_Previews: PreviewProvider {
+    static var previews: some View {
+        ContentView()
+    }
+}