XPC: too many nested collections when explicitly decoding a single collection on macOS 12.7 (not on macOS Tahoe)

Question

Macho Man Randy Savage OP

Created 1d

Replies 2

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I have a custom object which gets passed back to the main app from XPC.

I whitelist it like so:

NSSet *expectedClass = [NSSet setWithObjects:[NSArray class],
                                                 [MyCustomClass class],
                                                 nil];

   [interface setClasses:expectedClass      forSelector:@selector(myMethodNameHere:withCompletion:)
            argumentIndex:0
                  ofReply:YES];

Now my custom class conforms to NSSecureCoding. It does have an array property of another custom class.

@property (nonatomic,readonly) NSArray *arraypropertyOfOtherClass;

Which is decoded in -initWithCoder: using:

-decodeArrayOfObjectsOfClasses:forKey:

Now on macOS Tahoe this is all walking fine. But I just tested on macOS Monterey and I get the following error:

Exception: decodeObjectForKey: too many nested collections when explicitly decoding a single collection.

How should I handle this for earlier versions of macOS?

Answered by Macho Man Randy Savage in 862138022

So using -decodeObjectOfClasses:forKey: with the NSArray class and the custom class (like I mentioned in the above post) works on macOS 12.7.

// in the -initWithCoder
 NSSet *classesSet = [NSSet setWithObjects:[NSArray class],[MyCustomClass class],nil];

_arraypropertyOfOtherClass = [aDecoder decodeObjectOfClasses:classesSet forKey:@"myKey"];

Not sure when -decodeArrayOfObjectsOfClasses:forKey: started working but beware of this if you are deploying back to 12.7, you can't use -decodeArrayOfObjectsOfClasses:forkey: with XPC.

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Answer 1

Macho Man Randy Savage OP

1d

Going to try

    NSSet *classesSet = [NSSet setWithObjects:[NSArray class],
                      [MyCustomClass class],
                      nil];

_arraypropertyOfOtherClass = [aDecoder decodeObjectOfClasses:classesSet forKey:@"myKey"];

instead of -decodeArrayOfObjectsOfClasses:forKey: but I have to archive and notarize again and then send to the Mac with 12.7 to test. Will let everyone know if it works.

Would be great to get a macOS simulator someday :)

0

Answer 2

Macho Man Randy Savage OP

1d

Accepted Answer

So using -decodeObjectOfClasses:forKey: with the NSArray class and the custom class (like I mentioned in the above post) works on macOS 12.7.

// in the -initWithCoder
 NSSet *classesSet = [NSSet setWithObjects:[NSArray class],[MyCustomClass class],nil];

_arraypropertyOfOtherClass = [aDecoder decodeObjectOfClasses:classesSet forKey:@"myKey"];

Not sure when -decodeArrayOfObjectsOfClasses:forKey: started working but beware of this if you are deploying back to 12.7, you can't use -decodeArrayOfObjectsOfClasses:forkey: with XPC.

0