ios - UIActivityTypeMessage 支持的格式

Question

iOS7.0中UIActivityTypeMessage支持的文件格式类型有哪些..

我正在尝试创建一个录音机，因此希望使用 iMessage 共享以 .m4a 格式录制的音频。

请就可能的解决方案提出建议。另请注意，我已尝试同时使用 UIActivityViewController 和 UIDocumentInteractionController 但 iMessage 选项不会弹出。

UIActivityViewController,

pathUrl = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"test" ofType:@"m4a"]];

controller = [[UIActivityViewController alloc] initWithActivityItems:@[pathUrl] applicationActivities:nil];
controller.excludedActivityTypes = @[UIActivityTypeAddToReadingList,UIActivityTypeAirDrop,UIActivityTypeAssignToContact,UIActivityTypeCopyToPasteboard,UIActivityTypePostToFacebook,UIActivityTypePostToFlickr,UIActivityTypePostToTencentWeibo,UIActivityTypePostToTwitter,UIActivityTypePostToVimeo,UIActivityTypePostToWeibo,UIActivityTypePrint,UIActivityTypeSaveToCameraRoll];

[self presentViewController:controller animated:YES completion:nil];

UIDocumentInteractionController,

interactionController = [UIDocumentInteractionController interactionControllerWithURL:pathUrl];
interactionController.delegate = self;
[interactionController presentOptionsMenuFromRect:CGRectMake(0.0f, 0.0f, 160.0f, 200.0f) inView:self.view animated:YES];