a switch bug in swift? - “Switch must be exhaustive, consider adding a default clause.”

Question

I am positive that the following swift code has covered all possibilities, but Xcode keeps telling me that, \"Switch must be exhaustive, consider ad

Answer 1

The compiler is unable to conclude about your pattern because it is too complex or too unusual for it. If your pattern would have been more regular like:

case (true, false, _):
    print("Moved left!!!")
case (true, true, _):
    print("Moved right!!!")
case (false, false, _):
    print("Moved up!!!")
case (false, true, _):
    print("Moved down!!!")

then the compiler would have not complained. It that case it is easy for it to conclude that you covered all the cases.