IOS Custom Icon Email Attachment

Question

I registered my own custom CFBundleDocumentTypes filetype as described in this link: How do I register a custom filetype in iOS

Everything is working fine except when I send a mail via MFMailComposeViewController there is still this plain default attachment icon instead of my own. When I receive the mail my own icon is displayed. Is it possible to change the default MFMailComposeViewController-attachment icon when sending the mail?

Thanks for your help, Martin

Answer 1

When you add the attachment are you specifying the mime type correctly for your custom filetype? Perhaps you need to explicitly convert your UTI to a MIME type and then specify that when using the MFMailComposeViewController method:

- (void)addAttachmentData:(NSData*)attachment mimeType:(NSString*)mimeType fileName:(NSString*)filename

Converting UTI to MIME type

NSString *filePath = ... // file path for your file of a custom type.
CFStringRef fileExtension = (__bridge CFStringRef)[filePath pathExtension];
CFStringRef UTI = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, fileExtension, NULL);
CFStringRef MIMEType = UTTypeCopyPreferredTagWithClass(UTI, kUTTagClassMIMEType);
CFRelease(UTI);
NSString *MIMETypeString = (__bridge_transfer NSString *)MIMEType;

Make sure to add and import the following frameworks:

#import <MobileCoreServices/MobileCoreServices.h>
#import <CoreServices/CoreServices.h>

Code snippet source: Damien DeVille