fix: tts now works in background in iOS, closes #547 (#822)

To enable background playback in Android, go to Settings > Apps & Notifications > Readest > Battery > Battery Optimization, and disable battery optimization for Readest.

apps/readest-app/src-tauri/plugins/tauri-plugin-native-bridge/build.rs

@@ -2,6 +2,7 @@ const COMMANDS: &[&str] = &[
     "auth_with_safari",
     "auth_with_custom_tab",
     "copy_uri_to_path",
+    "use_background_audio",
 ];
 
 fn main() {

apps/readest-app/src-tauri/plugins/tauri-plugin-native-bridge/ios/Sources/NativeBridgePlugin.swift

@@ -1,4 +1,6 @@
 import AuthenticationServices
+import AVFoundation
+import MediaPlayer
 import SwiftRs
 import Tauri
 import UIKit
@@ -8,9 +10,33 @@ class SafariAuthRequestArgs: Decodable {
   let authUrl: String
 }
 
+class UseBackgroundAudioRequestArgs: Decodable {
+  let enabled: Bool
+}
+
 class NativeBridgePlugin: Plugin {
   private var authSession: ASWebAuthenticationSession?
 
+  @objc public func use_background_audio(_ invoke: Invoke) {
+    do {
+      let args = try invoke.parseArgs(UseBackgroundAudioRequestArgs.self)
+      let enabled = args.enabled
+      let session = AVAudioSession.sharedInstance()
+      if enabled {
+        try session.setCategory(.playback, mode: .default, options: [.mixWithOthers])
+        try session.setActive(true)
+        print("AVAudioSession activated")
+      } else {
+        try session.setActive(false)
+        MPNowPlayingInfoCenter.default().nowPlayingInfo = nil
+        print("AVAudioSession deactivated")
+      }
+      invoke.resolve()
+    } catch {
+      print("Failed to set up audio session:", error)
+    }
+  }
+
   @objc public func auth_with_safari(_ invoke: Invoke) throws {
     let args = try invoke.parseArgs(SafariAuthRequestArgs.self)
     let authUrl = URL(string: args.authUrl)!

apps/readest-app/src-tauri/plugins/tauri-plugin-native-bridge/permissions/autogenerated/commands/use_background_audio.toml

@@ -0,0 +1,13 @@
+# Automatically generated - DO NOT EDIT!
+
+"$schema" = "../../schemas/schema.json"
+
+[[permission]]
+identifier = "allow-use-background-audio"
+description = "Enables the use_background_audio command without any pre-configured scope."
+commands.allow = ["use_background_audio"]
+
+[[permission]]
+identifier = "deny-use-background-audio"
+description = "Denies the use_background_audio command without any pre-configured scope."
+commands.deny = ["use_background_audio"]

apps/readest-app/src-tauri/plugins/tauri-plugin-native-bridge/permissions/autogenerated/reference.md

@@ -7,6 +7,7 @@ Default permissions for the plugin
 - `allow-auth-with-safari`
 - `allow-auth-with-custom-tab`
 - `allow-copy-uri-to-path`
+- `allow-use-background-audio`
 
 ## Permission Table
 
@@ -92,6 +93,32 @@ Enables the copy_uri_to_path command without any pre-configured scope.
 
 Denies the copy_uri_to_path command without any pre-configured scope.
 
+</td>
+</tr>
+
+<tr>
+<td>
+
+`native-bridge:allow-use-background-audio`
+
+</td>
+<td>
+
+Enables the use_background_audio command without any pre-configured scope.
+
+</td>
+</tr>
+
+<tr>
+<td>
+
+`native-bridge:deny-use-background-audio`
+
+</td>
+<td>
+
+Denies the use_background_audio command without any pre-configured scope.
+
 </td>
 </tr>
 </table>

apps/readest-app/src-tauri/plugins/tauri-plugin-native-bridge/permissions/default.toml

@@ -1,3 +1,3 @@
 [default]
 description = "Default permissions for the plugin"
-permissions = ["allow-auth-with-safari", "allow-auth-with-custom-tab", "allow-copy-uri-to-path"]
+permissions = ["allow-auth-with-safari", "allow-auth-with-custom-tab", "allow-copy-uri-to-path", "allow-use-background-audio"]

apps/readest-app/src-tauri/plugins/tauri-plugin-native-bridge/permissions/schemas/schema.json

@@ -331,10 +331,22 @@
           "markdownDescription": "Denies the copy_uri_to_path command without any pre-configured scope."
         },
         {
-          "description": "Default permissions for the plugin\n#### This default permission set includes:\n\n- `allow-auth-with-safari`\n- `allow-auth-with-custom-tab`\n- `allow-copy-uri-to-path`",
+          "description": "Enables the use_background_audio command without any pre-configured scope.",
+          "type": "string",
+          "const": "allow-use-background-audio",
+          "markdownDescription": "Enables the use_background_audio command without any pre-configured scope."
+        },
+        {
+          "description": "Denies the use_background_audio command without any pre-configured scope.",
+          "type": "string",
+          "const": "deny-use-background-audio",
+          "markdownDescription": "Denies the use_background_audio command without any pre-configured scope."
+        },
+        {
+          "description": "Default permissions for the plugin\n#### This default permission set includes:\n\n- `allow-auth-with-safari`\n- `allow-auth-with-custom-tab`\n- `allow-copy-uri-to-path`\n- `allow-use-background-audio`",
           "type": "string",
           "const": "default",
-          "markdownDescription": "Default permissions for the plugin\n#### This default permission set includes:\n\n- `allow-auth-with-safari`\n- `allow-auth-with-custom-tab`\n- `allow-copy-uri-to-path`"
+          "markdownDescription": "Default permissions for the plugin\n#### This default permission set includes:\n\n- `allow-auth-with-safari`\n- `allow-auth-with-custom-tab`\n- `allow-copy-uri-to-path`\n- `allow-use-background-audio`"
         }
       ]
     }

apps/readest-app/src-tauri/plugins/tauri-plugin-native-bridge/src/commands.rs

@@ -27,3 +27,11 @@ pub(crate) async fn copy_uri_to_path<R: Runtime>(
 ) -> Result<CopyURIResponse> {
     app.native_bridge().copy_uri_to_path(payload)
 }
+
+#[command]
+pub(crate) async fn use_background_audio<R: Runtime>(
+    app: AppHandle<R>,
+    payload: UseBackgroundAudioRequest,
+) -> Result<()> {
+    app.native_bridge().use_background_audio(payload)
+}

apps/readest-app/src-tauri/plugins/tauri-plugin-native-bridge/src/desktop.rs

@@ -25,4 +25,8 @@ impl<R: Runtime> NativeBridge<R> {
     pub fn copy_uri_to_path(&self, _payload: CopyURIRequest) -> crate::Result<CopyURIResponse> {
         Err(crate::Error::UnsupportedPlatformError)
     }
+
+    pub fn use_background_audio(&self, _payload: UseBackgroundAudioRequest) -> crate::Result<()> {
+        Err(crate::Error::UnsupportedPlatformError)
+    }
 }

apps/readest-app/src-tauri/plugins/tauri-plugin-native-bridge/src/lib.rs

@@ -40,6 +40,7 @@ pub fn init<R: Runtime>() -> TauriPlugin<R> {
             commands::auth_with_safari,
             commands::auth_with_custom_tab,
             commands::copy_uri_to_path,
+            commands::use_background_audio,
         ])
         .setup(|app, api| {
             #[cfg(mobile)]

apps/readest-app/src-tauri/plugins/tauri-plugin-native-bridge/src/mobile.rs

@@ -47,3 +47,11 @@ impl<R: Runtime> NativeBridge<R> {
             .map_err(Into::into)
     }
 }
+
+impl<R: Runtime> NativeBridge<R> {
+    pub fn use_background_audio(&self, payload: UseBackgroundAudioRequest) -> crate::Result<()> {
+        self.0
+            .run_mobile_plugin("use_background_audio", payload)
+            .map_err(Into::into)
+    }
+}

apps/readest-app/src-tauri/plugins/tauri-plugin-native-bridge/src/models.rs

@@ -25,3 +25,9 @@ pub struct CopyURIResponse {
     pub success: bool,
     pub error: Option<String>,
 }
+
+#[derive(Debug, Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct UseBackgroundAudioRequest {
+    pub enabled: bool,
+}