ios - EXC_BAD_ACCESS on NSClassFromString when class doesn't exist -

nsclassfromstring supposed return nil when can't find class, i'm getting exc_bad_access crash on this:

classname = "foo" var fooclass = nsclassfromstring(classname)

how can safely check non-existence of class in swift & objective-c?

this code working under swift:

var classname = "foo" var fooclass = nsclassfromstring(classname)

and 1 objective-c:

nsstring* classname = @"foo"; id fooclass = nsclassfromstring(classname);

your code seems correct

did try upgrade xcode in order have latest version of swift?

hj