feat(update):添加图片长按下载

example/ios/Runner/Info.plist

@@ -22,6 +22,12 @@
 	<string>????</string>
 	<key>CFBundleVersion</key>
 	<string>$(FLUTTER_BUILD_NUMBER)</string>
+	<key>NSCameraUsageDescription</key>
+	<string>示例需要使用相机拍照后上传到 OSS。</string>
+	<key>NSPhotoLibraryUsageDescription</key>
+	<string>示例需要访问相册以选择图片进行上传和预览。</string>
+	<key>NSPhotoLibraryAddUsageDescription</key>
+	<string>示例需要将长按查看的图片保存到系统相册。</string>
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
 	<key>UILaunchStoryboardName</key>