React本机处理FCM消息的IOS权限

是指在React Native开发中，使用Firebase Cloud Messaging（FCM）推送消息到iOS设备时，需要处理iOS设备的权限设置。

在iOS设备上，用户可以控制应用程序是否可以发送通知，并可以选择接收通知的方式。为了确保应用程序能够发送和接收FCM消息，需要在React Native应用程序中进行相应的配置和处理。

要处理FCM消息的iOS权限，可以按照以下步骤进行：

在Firebase控制台中创建一个项目，并将其与React Native应用程序关联。
在Xcode中打开React Native项目，并确保已正确配置Firebase SDK。
在Xcode中打开应用程序的AppDelegate.m文件，并添加以下代码：

#import <Firebase.h>
#import <UserNotifications/UserNotifications.h>

// ...

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
  // ...

  if ([UNUserNotificationCenter class] != nil) {
    [UNUserNotificationCenter currentNotificationCenter].delegate = self;
  }

  // ...

  [FIRApp configure];

  // ...

  return YES;
}

// ...

// Add the following methods to handle FCM token registration and message reception

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
{
  [FIRMessaging messaging].APNSToken = deviceToken;
}

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
{
  [[FIRMessaging messaging] appDidReceiveMessage:userInfo];

  // Handle your custom logic for receiving FCM messages here

  completionHandler(UIBackgroundFetchResultNoData);
}

// ...

// Add the following method to handle user's response to notifications

- (void)userNotificationCenter:(UNUserNotificationCenter *)center didReceiveNotificationResponse:(UNNotificationResponse *)response withCompletionHandler:(void (^)(void))completionHandler
{
  [[FIRMessaging messaging] appDidReceiveMessage:response.notification.request.content.userInfo];

  // Handle your custom logic for user's response to notifications here

  completionHandler();
}