How do you get a list of observable keypaths for KVO?-Collection of common programming errors

You cannot get a full list of kvo-compatible keys for an object. No such list exists. Not only is the object free to use whatever keys it wants, but it can even dynamically add new keys at runtime. The best you’re likely to be able to do is to iterate over all the properties, treat their names as keys, and perhaps iterate over methods looking for anything of the form -setFoo: to treat “foo” as a key. But this is not foolproof, and it’s not guaranteed to catch everything.