Learning Swift™ Programming

Implementing the AI Logic

Now that you’ve added logic for detecting when a player wins or loses, you can make the computer player strive to achieve a victory. This concerns steps 1 and 2 of the algorithm outlined earlier: The AI should move in for the kill, so to speak, if it has two tiles in a row, and it should block the human player if the human has two tiles in a row. To start processing the AI’s turn in the game, you call a new method named aiTurn. You place the new method calls at the bottom of the imageClicked function:

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  func imageClicked(reco: UITapGestureRecognizer) {      var imageViewTapped = reco.view as UIImageView      if plays[imageViewTapped.tag] == nil && !aiDeciding && !done {          setImageForSpot(imageViewTapped.tag, ...