Send attachments using sms/mms in iOS SDK

问题

In iOS 7, there is support for adding attachments in sms messages via third party applications.

I want to know:

1. What kind of files are supported as attachments? e.g. .png, .pdf etc.

2. Can I send NSData through an sms/mms message? e.g. .dat format

3. Would the recipient of these messages be able to open these attachments in third party applications using iOS's "Open In" feature?

回答1:

The MFMessageComposeViewController wants the attachment to have the correct extension for the type of image you're uploading. I verified by testing with a PNG file, and the following variations of adding the attachment data:

[messageController addAttachmentData:imgData typeIdentifier:@"public.data" filename:@"image"];
[messageController addAttachmentData:imgData typeIdentifier:@"public.data" filename:@"image.abc"];
[messageController addAttachmentData:imgData typeIdentifier:@"public.data" filename:@"image.png"];

Only the last option worked. I didn't need to change the typeIdentifier, although it probably would make sense to choose a UTI that matches the type of data.

回答2:

According to Apple MFMessageComposeViewController docs, you can do that by creating a MFMessageComposeViewController object, and add the attachment through the following functions:

func addAttachmentURL(URL, withAlternateFilename: String?)

Attaches a specified file to the message.

func addAttachmentData(Data, typeIdentifier: String, filename: String)

Attaches arbitrary content to the message.

(BTW you should check the canSendAttachments before you try to use those functions)

来源：https://stackoverflow.com/questions/24906712/send-attachments-using-sms-mms-in-ios-sdk