Open Radar

 
NOTE: This appears to be a regression to the behaviour reported in bug report #12005271

Summary:

Zippity (http://itunes.apple.com/gb/app/zippity/id513855390?ls=1&mt=8) is an app for opening Zip files (also gzip, bzip2 and tar files). It registers itself as a default handler for the following UTIs:

com.pkware.zip-archive
org.gnu.gnu-zip-archive
org.gnu.gnu-zip-tar-archive
public.bzip2-archive
public.tar-archive
public.tar-bzip2-archive
public.zip-archive

When a file with a .zip file extension is received by email the user can tap the file attachment icon and choose "Open in Zippity" to open the zip file.

In iOS 6 this doesn't always work. Zippity is offered as a handler for some zip files received by email but not others.

I've attached the source for a simple demo app (ZipOpener) that illustrates the problem. I've also attached the raw message source of a message with two zip files, one of which exhibits the problem and one of which doesn't.

Steps to Reproduce:

- Install the attached demo app (ZipOpener) on a device running iOS 6
- Mail yourself a copy of the attached email 
- Open the email and tap the file attachments

Expected Results:

You should be prompted to open the files in ZipOpener

Actual Results:

ZipOpener is not offered as an option for Markdown_1.0.1.zip

Regression:

This worked fine in iOS 5. It was broken in iOS 6 beta 3 (See bug report 12005271), and appeared to be fixed in iOS 6 beta 4.

I don't know if it worked in earlier iOS 6 betas, I didn't test them I'm afraid.

Notes:

I'm unclear which UTI should be used for zip files. public.zip-archive and com.pkware.zip-archive both exist. The documentation at https://developer.apple.com/library/ios/#documentation/Miscellaneous/Reference/UTIRef/Articles/System-DeclaredUniformTypeIdentifiers.html#//apple_ref/doc/uid/TP40009259-SW1 says the correct UTI is com.pkware.zip-archive, but UTTypeCreateAllIdentifiersForTag(kUTTagClassFilenameExtension, "zip", nil) returns only public.zip-archive. In any case, adding com.pkware.zip-archive to Zippity's UTI list doesn't solve the problem.

04-Dec-2012 09:32 AM Simon Whitaker:
Problem still exists in iOS 6.1 beta 3

Note: I've figured out the conditions under which the bug occurs. If the zip file has a dot in its filename (e.g. Foobar_1.2.zip) then Mail offers up a URL that excludes the file extension and has a UTI of public.data. Since my app (correctly) doesn't register itself for that UTI, it isn't being included in the list of handler apps offered to the user.