Interactive Widgets for iOS

[kewitschka]

Since iOS 17 interactive home widgets are supported. Therefore I added a BackgroundIntent as described in this tutorial: https://medium.com/@ABausG/interactive-homescreen-widgets-with-flutter-using-home-widget-83cb0706a417

import AppIntents
import Foundation
import home_widget

@available(iOS 17, *)
public struct BackgroundIntent: AppIntent {
  static public var title: LocalizedStringResource = "HomeWidget Background Intent"

  @Parameter(title: "Widget URI")
  var url: URL?

  @Parameter(title: "AppGroup")
  var appGroup: String?

  public init() {}

  public init(url: URL?, appGroup: String?) {
    self.url = url
    self.appGroup = appGroup
  }

  public func perform() async throws -> some IntentResult {
    await HomeWidgetBackgroundWorker.run(url: url, appGroup: appGroup!)

    return .result()
  }
}

/// This is required if you want to have the widget be interactive even when the app is fully suspended.
/// Note that this will launch your App so on the Flutter side you should check for the current Lifecycle State before doing heavy tasks
@available(iOS 17, *)
@available(iOSApplicationExtension, unavailable)
extension BackgroundIntent: ForegroundContinuableIntent {}

To be able to import home_widget, I added the following to the Podfile:

target 'AllTasksWidgetExtension' do
  inherit! :search_paths
end

When I try to build, I get the following error:

Error (Xcode): Undefined symbol: absl::lts_20240116::SimpleAtod(absl::lts_20240116::string_view, double*)
Error (Xcode): Undefined symbol: absl::lts_20240116::Base64Escape(absl::lts_20240116::string_view, std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator>*)
Error (Xcode): Undefined symbol: absl::lts_20240116::RFC3339_full
Error (Xcode): Undefined symbol: absl::lts_20240116::log_internal::LogMessage::OstreamView::stream()
Error (Xcode): Undefined symbol: absl::lts_20240116::log_internal::LogMessage::OstreamView::OstreamView(absl::lts_20240116::log_internal::LogMessage::LogMessageData&)
Error (Xcode): Undefined symbol: absl::lts_20240116::log_internal::LogMessage::OstreamView::~OstreamView()
Error (Xcode): Undefined symbol: void absl::lts_20240116::log_internal::LogMessage::CopyToEncodedBuffer<(absl::lts_20240116::log_internal::LogMessage::StringType)0>(absl::lts_20240116::string_view)

This is my complete podfile

# Uncomment this line to define a global platform for your project
# platform :ios, '15.0'

# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
ENV['COCOAPODS_DISABLE_STATS'] = 'true'

project 'Runner', {
  'Debug' => :debug,
  'Profile' => :release,
  'Release' => :release,
}

def flutter_root
  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'Generated.xcconfig'), __FILE__)
  unless File.exist?(generated_xcode_build_settings_path)
    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure flutter pub get is executed first"
  end

  File.foreach(generated_xcode_build_settings_path) do |line|
    matches = line.match(/FLUTTER_ROOT\=(.*)/)
    return matches[1].strip if matches
  end
  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Generated.xcconfig, then run flutter pub get"
end

require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)

flutter_ios_podfile_setup
target 'Runner' do
  pod 'FirebaseFirestore', :git => 'https://github.com/invertase/firestore-ios-sdk-frameworks.git', :tag => '11.0.0'
  use_frameworks!
  use_modular_headers!

  flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
  target 'RunnerTests' do
    inherit! :search_paths
  end
    target 'AllTasksWidgetExtension' do
      inherit! :search_paths
    end
end

post_install do |installer|
  installer.pods_project.targets.each do |target|
    flutter_additional_ios_build_settings(target)
  end
end

[ABausG]

You should not use all inherit. As per the docs:

you should only add home_widget to your Widget target:

target 'YourWidgetExtension' do
   use_frameworks!
   use_modular_headers!

   pod 'home_widget', :path => '.symlinks/plugins/home_widget/ios'
end

[kewitschka]

Thank you very much!