Keychain Query Always Returns errSecItemNotFound After Upgrading to iOS 13

Question

I am storing passwords into the iOS keychain and later retrieving them to implement a \"remember me\" (auto-login) feature on my app.

I implemented my own wrapper aroun

Answer 1

After half a day of experimentation I discovered that using a pretty basic instance of kSecClassGenericPassword I had the problem on both the simulator and real hardware. After having a read over of the docs I noticed that kSecAttrSynchronizable has a kSecAttrSynchronizableAny. To accept any value for any other attribute, you simply don't include it in the query. That's a clue.

I found that when I included kSecAttrSynchronizable set to kSecAttrSynchronizableAny the queries all worked. Of course I could also set it to either kCFBooleanTrue (or *False) if I actually do want to filter on that value.

Given that attribute everything seems to work as expected for me. Hopefully this will save some other people a half day of mucking around with test code.