首先将下面的代码复制并粘贴到你的podfile中。然后设置'PERMISSION_PHOTOS=1'，如果你不想使用另一个权限，你可以删除或设置它=0（exp 'PERMISSION_CAMERA=0'，）。

post_install do |installer|
   installer.pods_project.targets.each do |target|
     flutter_additional_ios_build_settings(target)
     target.build_configurations.each do |config|
           # You can remove unused permissions here
           # e.g. when you don't need camera permission, just add 'PERMISSION_CAMERA=0'
           config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= [
                '$(inherited)',
                ## dart: PermissionGroup.calendar
    
                ## dart: PermissionGroup.reminders
    
                ## dart: PermissionGroup.contacts
    
                ## dart: PermissionGroup.camera
                'PERMISSION_CAMERA=1',
                ## dart: PermissionGroup.microphone
                'PERMISSION_MICROPHONE=1',
                ## dart: PermissionGroup.speech
                'PERMISSION_SPEECH_RECOGNIZER=1',
                ## dart: PermissionGroup.photos
                'PERMISSION_PHOTOS=1',
                ## dart: [PermissionGroup.location, PermissionGroup.locationAlways, PermissionGroup.locationWhenInUse]
    
                ## dart: PermissionGroup.notification
    
                ## dart: PermissionGroup.mediaLibrary
                'PERMISSION_MEDIA_LIBRARY=1',
                ## dart: PermissionGroup.sensors
    
                ## dart: PermissionGroup.bluetooth
    
                ## dart: PermissionGroup.appTrackingTransparency
                'PERMISSION_APP_TRACKING_TRANSPARENCY=1',
                ## dart: PermissionGroup.criticalAlerts
                'PERMISSION_SENSORS=1'
          ]
       end
   end
end

然后将其添加到info.plist文件中

<key>NSPhotoLibraryUsageDescription</key>
<string>We need Photos access to allow you to update Profile Picture.</string>

最后，在项目中使用permission_handler插件，并在需要请求权限的地方添加此代码。

var permissionStatus = await permission.request();

使用最新的permission_handler:包。将照片权限添加到Info.plist文件。

<!-- Permission options for the `photos` group -->
    <key>NSPhotoLibraryUsageDescription</key>
    <string>photos</string>

将以下内容添加到Podfile文件中：

post_install do |installer|
  installer.pods_project.targets.each do |target|
    ... # Here are some configurations automatically generated by flutter

    # Start of the permission_handler configuration
    target.build_configurations.each do |config|

      # You can enable the permissions needed here. For example to enable camera
      # permission, just remove the `#` character in front so it looks like this:
      #
      # ## dart: PermissionGroup.camera
      # 'PERMISSION_CAMERA=1'
      #
      #  Preprocessor definitions can be found in: https://github.com/Baseflow/flutter-permission-handler/blob/master/permission_handler_apple/ios/Classes/PermissionHandlerEnums.h
      config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= [
        '$(inherited)',

        ## dart: PermissionGroup.calendar
        # 'PERMISSION_EVENTS=1',

        ## dart: PermissionGroup.reminders
        # 'PERMISSION_REMINDERS=1',

        ## dart: PermissionGroup.contacts
        # 'PERMISSION_CONTACTS=1',

        ## dart: PermissionGroup.camera
        # 'PERMISSION_CAMERA=1',

        ## dart: PermissionGroup.microphone
        # 'PERMISSION_MICROPHONE=1',

        ## dart: PermissionGroup.speech
        # 'PERMISSION_SPEECH_RECOGNIZER=1',

        ## dart: PermissionGroup.photos
         'PERMISSION_PHOTOS=1',

        ## dart: [PermissionGroup.location, PermissionGroup.locationAlways, PermissionGroup.locationWhenInUse]
        # 'PERMISSION_LOCATION=1',

        ## dart: PermissionGroup.notification
        # 'PERMISSION_NOTIFICATIONS=1',

        ## dart: PermissionGroup.mediaLibrary
        # 'PERMISSION_MEDIA_LIBRARY=1',

        ## dart: PermissionGroup.sensors
        # 'PERMISSION_SENSORS=1',   

        ## dart: PermissionGroup.bluetooth
        # 'PERMISSION_BLUETOOTH=1',

        ## dart: PermissionGroup.appTrackingTransparency
        # 'PERMISSION_APP_TRACKING_TRANSPARENCY=1',

        ## dart: PermissionGroup.criticalAlerts
        # 'PERMISSION_CRITICAL_ALERTS=1'
      ]

    end 
    # End of the permission_handler configuration
  end
end

如果需要添加更多权限，请单击此处。删除要使用的权限前面的#字符。例如

## dart: PermissionGroup.photos
             'PERMISSION_PHOTOS=1',

在flutter中，请求var status = await Permission.photos.request（）; if（status.isDenied）{ //我们还没有请求权限，或者权限已经被拒绝，但不是永久性的。}
最后清洁和重建

权限包在iOS上的行为已更改为默认拒绝所有权限。您必须更新PList并打开希望在应用程序中使用的权限，才能使其工作。