MFMessageComposeViewController iOS7 addAttachmentData:typeIdentifier:filename: 不工作

问题描述

我想在 iOS7 上将图像附加到彩信.我写了以下代码:

I want to attach an image to a MMS, on iOS7. I wrote following code:

    MFMessageComposeViewController *messageController = [[MFMessageComposeViewController alloc] init];
    messageController.messageComposeDelegate = self;

    NSData *imgData = [NSData dataWithContentsOfFile:@"blablabla"];
    BOOL didAttachImage = [messageController addAttachmentData:imgData typeIdentifier:@"public.data" filename:@"image"];

    if (didAttachImage)
    {
        // Present message view controller on screen
        [self presentViewController:messageController animated:YES completion:nil];
    }
    else
    {
        UIAlertView *warningAlert = [[UIAlertView alloc] initWithTitle:@"Error"
                                                               message:@"Failed to attach image"
                                                              delegate:nil
                                                     cancelButtonTitle:@"OK"
                                                     otherButtonTitles:nil];
        [warningAlert show];
        return;
    }

问题是出现短信画面时，无法识别图片，无法发送.我看到的是这样的:

The problem is that when the SMS screen is presented, it doesn't recognize the image, and cannot send it. I see something like this:

我相信这与我发送的 imgData 或 typeIdentifier 有关.

I believe this has something to do either with imgData I am sending, or with typeIdentifier.

注意:我尝试了几乎所有可能的 typeIdentifiers:@"public.data", @"public.image", @"public.item", ... 等等.都没有用.

Note: I tried almost all possible typeIdentifiers:@"public.data", @"public.image", @"public.item", ... etc. None worked.

有人可以帮我吗?您使用的 typeIdentifier 是什么?我正在 iPhone 5、iOS 7.0.2 上进行测试.

Can anybody please help me? What is the typeIdentifier you are using? I am testing on iPhone 5, iOS 7.0.2.

谢谢.

解决方案:

按照 Greg 的指示，这解决了我的问题:将文件名设置为 @"image.png"，并将 typeIdentifier 设置为 kUTTypePNG.

As Greg instructed, this solved my problem: set filename as @"image.png", and typeIdentifier to kUTTypePNG.

[messageController addAttachmentData:imgData typeIdentifier:(NSString *)kUTTypePNG filename:@"image.png"];

谢谢格雷格.

推荐答案

MFMessageComposeViewController 希望附件具有适合您上传的图像类型的正确扩展名.我通过使用 PNG 文件进行测试以及添加附件数据的以下变体进行了验证:

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"];

只有最后一个选项有效.我不需要更改 typeIdentifier，尽管选择与数据类型匹配的 UTI 可能更有意义.

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.

UTI 的完整列表可在此处获得:系统声明的统一类型标识符(感谢@iWasRobbed！)

The full list of UTIs is available here: System-Declared Uniform Type Identifiers (Thanks @iWasRobbed!)

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