Code error in Tic-Tac-Toe game - ios

Question

I would really appreciate your help with the following. I have been battling this small nuisance for a while now but without luck. I have this bit of code thats basically simulates a AI playing TIC TAC TOE against a player.
let Result = RowCheck(value: 0)
if Result != nil {
println("Computer has two in a row")
var WhereToPlayResult = WhereToPlay(Result.location, pattern: Result.pattern)
if !IsOccupied(WhereToPlayResult) {
SetImageForSpot(WhereToPlayResult, player: 0)
aiDeciding = false
CheckForWin()
return
}
return
}
RowCheck just checks for a pattern to play against.
func RowCheck(#‎value:Int) -> (location:String,pattern:String)? {
var AcceptableFinds = ["011","110","101"]
var FindFuncs = [CheckTop,CheckBottom,CheckLeft,CheckRight,CheckMiddleAcross,CheckMiddleDown,CheckDiagionalRightLeft,CheckDiagionalLeftRight]
for Algorthm in FindFuncs {
var AlgorthmResults = Algorthm(value:value)
if (find(AcceptableFinds,AlgorthmResults.pattern) != nil) {
return AlgorthmResults
}
}
return nil
}
But it gives me an error at:
var WhereToPlayResult = WhereToPlay(Result.location, pattern: Result.pattern)

Answer 1

Because your RowCheck method returns an optional (and might return nil), you need to either unwrap your optional or use a different assignment:
let Result = RowCheck(value: 0)
if Result != nil {
var WhereToPlayResult = WhereToPlay(Result!.location, pattern: Result!.pattern)
// ... ^ ^
}
if let Result = RowCheck(value: 0) {
// ...
}
Side note: only classes should be named starting with a capital letter. To stay within Apple's code style, you should variables and functions as result, rowCheck, etc.