Flutter iOS配置flutter_local_notifications时参数标签错误求助

这个错误是Flutter SDK版本与示例代码版本不匹配导致的——不同版本的Flutter生成的GeneratedPluginRegistrant类中，register方法的参数标签不一样，要么是with:，要么是withRegistry:。

解决步骤： #

1. 打开iOS项目中的GeneratedPluginRegistrant.swift文件（路径：ios/Runner/GeneratedPluginRegistrant.swift）
2. 找到register静态方法的定义，确认它的参数标签是with:还是withRegistry:
3. 将AppDelegate.swift中所有调用GeneratedPluginRegistrant.register的地方，统一改成和文件里一致的参数标签

示例修正代码： #

如果你的GeneratedPluginRegistrant里是withRegistry:：

import UIKit
import Flutter
import Firebase
import flutter_local_notifications

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    FirebaseApp.configure()
    FlutterLocalNotificationsPlugin.setPluginRegistrantCallback { (registry) in
        GeneratedPluginRegistrant.register(withRegistry: registry)
    }
    if #available(iOS 10.0, *) {
        UNUserNotificationCenter.current().delegate = self
    }
    GeneratedPluginRegistrant.register(withRegistry: self)
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}

如果你的GeneratedPluginRegistrant里是with:：

import UIKit
import Flutter
import Firebase
import flutter_local_notifications

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    FirebaseApp.configure()
    FlutterLocalNotificationsPlugin.setPluginRegistrantCallback { (registry) in
        GeneratedPluginRegistrant.register(with: registry)
    }
    if #available(iOS 10.0, *) {
        UNUserNotificationCenter.current().delegate = self
    }
    GeneratedPluginRegistrant.register(with: self)
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}

额外说明： #

• 不要盲目照搬示例代码，示例代码的版本可能和你当前使用的Flutter SDK版本不一致
• UNUserNotificationCenter.current().delegate = self不需要加as? UNUserNotificationCenterDelegate，因为FlutterAppDelegate已经默认实现了这个协议

内容的提问来源于stack exchange，提问作者mzkaoq