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iosobjective-cnscodingnskeyedunarchiver

Does NSKeyedUnarchiver still throw exceptions in iOS9?

Consider the following snippet that tries to created an NSKeyedUnarchiver from an invalid NSData object.

NSData *data = [@"foo" dataUsingEncoding:NSUTF8StringEncoding];
NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];

When I run this on an iOS 8.4 simulator, I get an NSInvalidArgumentException. On an iOS 9.1 simulator, however, the initializer simply returns nil.

However, according do the official docs, the method should always throw an exception on invalid data.

This method throws an exception if data is not a valid archive.

Why does it only throw an exception on iOS8 but not on iOS9? Is this new behavior in iOS 9 that was simply not documented yet?

Solution

  • Yes, confirmed iOS 9 devices ( not sure of simulator ) will throw an exception under certain circumstances. Here is an example exception which I am currently looking into.

    NSInvalidArgumentException
Description: *** -[NSKeyedUnarchiver initForReadingWithData:]: incomprehensible archive (0x2d, 0xffffffa4, 0xffffffb3, 0x44, 0xffffffbe, 0xffffff89, 0xffffffcb, 0xffffffcf)