How can I test an NSString for being nil?

Question

Can I simply use

if(myString == nil)

For some reason a string that I know is null, is failing this statement.

Answer 1

Notice length = 0 doesn't necessary mean it's nil

NSString *test1 = @"";
NSString *test2 = nil;

They are not the same. Although both the length are 0.

Answer 2

Check NSAttributedString is empty:

let isEmpty = atrributedString.string.isEmpty