Nil is not compatible with expected argument type UIViewAnimationOptions
It's because UIViewAnimationOptions is an OptionSet type, not Optional typeOptionSet according to apple
You use the OptionSet protocol to represent
bitsettypes, where individual bits represent members of a set.
it's mainly used to create a combined flag from the current flags inside the set,in your case animation flags or types we can call them, this will give you the ability to combine options to make the final desired option, there are about 23 option, however in your case you can just pass an empty OptionSet as []