This is not Blackjack…

while, switch, 回傳東西的function, nested loop, struct, AVPlayerLooper, shuffle, array, alert…

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彼得潘的 Swift iOS / Flutter App 開發教室

14 min readJun 22, 2021

成品：對於無法完成完整玩法而屈服的自己深感遺憾…😔

▲但本來就不打算(也不知怎)做八副牌混合與使牌減少，一樣不完整啦😅
▲Blackjack屬一澳洲特別回憶，路人還分紅道謝因他壓我會拿到對😂
▲簡化版沒Split, Double, Insurance, Five card Charlie, 除Blackjack, A算1點
▲玩家 Blackjack 莊家不是時莊家馬上輸不用至 17 點，因沒別的玩家要比
▲非美式 Blackjack 所以無蓋牌，使用 PUSH 因字數比 Stand off 少較合圖
▲決定放棄後難度瞬間大跌，如有神助迅速完成！結果網誌卡好久😑

其實我有用音樂但懶得錄, 可點下面Youtube邊聽邊看😉 歌詞也和賭博有關喔!

(左)一起Blackjack也太難得! (右) 過五關機率不低，難怪除特殊玩法外賭場都不給贏了!

前置作業

▲找教我玩的朋友把規則再搞清楚一次順便回味一起在澳洲發生的事😂
▲找什麼圖都不滿意，除那三行弧形文字和手，全用keynote自己做(累)
▲Storyboard 版面配置
▲較特別是按籌碼後想它出現在下注圓圈內，因此放很多 ImageView

新增 Swift File 用 struct定義 Card 型別：花色與點數設為字串

import Foundationstruct Card {
var suit : String
var rank : String
}

重複放音樂：彼得完整教學於此

▲加入 AVFoundation 函式庫
▲利用 AVPlayerLooper 重複播放
▲下 5 行寫於 ViewDidLoad 內
➞生成 AVQueuePlayer 物件
➞利用 Bundle.man 取得APP資料夾內音樂檔(之前我們匯入的)彼得教學
➞利用 AVPlayerItem 生成要播放的音樂
➞生成 AVPlayerLooper，傳入剛生成的 player & item
➞開始播放音樂

import AVFoundationvar looper: AVPlayerLooper?let player = AVQueuePlayer()
let fileUrl = Bundle.main.url(forResource: "Kenny Rogers - The Gambler", withExtension: "mp3")!
let playerItem = AVPlayerItem(url: fileUrl)
looper = AVPlayerLooper(player: player, templateItem: playerItem)
player.play()

拉 IBOutlet，其中莊家 5 張牌是拉 Outlet Collection為陣列

▲紅線部份本為空行，但太長照不起來便以刪空行畫紅線來呈現
▲取名時第一個字不能為數字…只好採用英文序數

52 張撲克牌製成：巢狀迴圈，並於 ViewDidLoad 內寫此 function

let suits = [“♠️”, “♥️”, “♦️”, “♣️”]
let ranks = [“A”, “2”, “3”, “4”, “5”, “6”, “7”, “8”, “9”, “10”, “J”, “Q”, “K”]var cards = [Card]()func createCards() {
    for suit in suits {
        for rank in ranks {
            let card = Card(suit: suit, rank: rank)
            cards.append(card)
        }
    }
}

其餘變數：count 為按籌碼按鈕次數，index 為檯面上牌的張數

var count = 0var wagerAmount = 0
var totalAmount = 1000var index = 0var playerPoint = 0
var dealerPoint = 0

定義各 function

▲下注金額為 10-100，依各情形鎖住按鈕，本想用switch但有個是≥🤦🏻‍♀️

func limitOfWager() {     if wagerAmount == 100 {
         buttonOf50Chip.isEnabled = false
         buttonOf20Chip.isEnabled = false
         buttonOf10Chip.isEnabled = false
     } else if wagerAmount == 90 {
         buttonOf50Chip.isEnabled = false
         buttonOf20Chip.isEnabled = false
     } else if wagerAmount == 80 {
         buttonOf50Chip.isEnabled = false
     } else if wagerAmount == 70 {
         buttonOf50Chip.isEnabled = false
     } else if wagerAmount == 60 {
         buttonOf50Chip.isEnabled = false
     } else if wagerAmount >= 10 {
         dealButton.isEnabled = true
     }
}

▲依總金額不同鎖不同按鈕

func limitOfTotalAmount() {    if totalAmount < 10 {
        buttonOf50Chip.isEnabled = false
        buttonOf20Chip.isEnabled = false
        buttonOf10Chip.isEnabled = false
    } else if totalAmount < 20 {
        buttonOf50Chip.isEnabled = false
        buttonOf20Chip.isEnabled = false
    } else if totalAmount < 50 {
        buttonOf50Chip.isEnabled = false
    }
}

▲每按 1 次 10/20/50 籌碼相對應之結果，此只舉例 10 元籌碼

func plus10chip() {
    count += 1
    wagerAmount += 10
    totalAmount -= 10
    wagerLabel.text = “\(wagerAmount)”
    totalLabel.text = “\(totalAmount)”
    limitOfWager()
    limitOfTotalAmount()
}

▲反悔下注金額未按發牌前及判斷輸贏後皆以此恢復初始值 / 畫面

func revisionOfTheChips() {
    totalAmount += wagerAmount
    totalLabel.text = “\(totalAmount)”
    count = 0
    wagerAmount = 0
    wagerLabel.text = “”    first10ChipImage.isHidden = true
    second10ChipImage.isHidden = true
    third10ChipImage.isHidden = true
    fourth10ChipImage.isHidden = true
    fifth10ChipImage.isHidden = true
    sixth10ChipImage.isHidden = true
    seventh10ChipImage.isHidden = true
    eighth10ChipImage.isHidden = true
    ninth10ChipImage.isHidden = true
    tenth10ChipImage.isHidden = true
    first20ChipImage.isHidden = true
    second20ChipImage.isHidden = true
    third20ChipImage.isHidden = true
    fourth20ChipImage.isHidden = true
    fifth20ChipImage.isHidden = true
    first50ChipImage.isHidden = true
    second50ChipImage.isHidden = true
    buttonOf10Chip.isEnabled = true
    buttonOf20Chip.isEnabled = true
    buttonOf50Chip.isEnabled = true
    dealButton.isEnabled = false
}

▲贏 / 輸 / 平手 / 爆各情形，此只舉例贏且非 Blackjack 贏時

func playerWin() {
    playerResultImage.isHidden = false
    playerResultImage.image = UIImage(named: “U WIN”)
    wagerAmount *= 2
    revisionOfTheChips()
}

▲生成莊家第 2 張牌 (陣列為 1 總牌數則因不同情形不同) 並計算點數

func createDealerCard2AndCount() {
    dealerCardImage[1].isHidden = false
    dealerCardImage[1].image = UIImage(named: cards[index].suit + cards[index].rank)
    dealerPoint += RankPoint(rank: cards[index].rank)
    dealerPointLabel.text = “\(dealerPoint)”
}

▲莊家 Blackjack 時的不同結果 (實質是 11 點所以不算點數用字串判斷)

func dealerBlackjackResult() {
    dealerPointLabel.text = “21”
    dealerBlackjackImage.isHidden = false
    if playerPointLabel.text == “21” && playerCard3Image.isHidden ==  true {
       Push()
    } else {
        playerLose()
    }
}

▲莊家牌超過 16 點後判斷輸贏結果

func finalResult() {
    if dealerPoint > 21 {
        dealerResultImage.isHidden = false
        dealerResultImage.image = UIImage(named: “BUST”)
        playerWin()
    } else if dealerPoint < playerPoint {
        playerWin()
    } else if dealerPoint > playerPoint {
        playerLose()
    } else {
        Push()
    }
}

▲莊家有第 5 張牌時所有牌之位置調整

func positionOf5DealerCard() {
    if dealerCardImage[4].isHidden == false {
        dealerCardImage[1].frame = CGRect(x: 340, y: 14, width: 92, height: 119)
        dealerCardImage[2].frame = CGRect(x: 264, y: 14, width: 92, height: 119)
        dealerCardImage[3].frame = CGRect(x: 188, y: 14, width: 92, height: 119)
    }
}

⭐ 回傳東西的 function：回傳東西: point，型別: Int (特設AJQK點數)

func RankPoint(rank: String) -> Int {
    var point = 0
    switch rank {
    case “A”:
        point = 1
    case “J”, “Q”, “K”:
        point = 10
    default:
        point = Int(rank)!
    }
    return point
}

拉 IBAction

@IBAction func bet10Chip(_ sender: UIButton) {
}
@IBAction func bet20Chip(_ sender: UIButton) {
}
@IBAction func bet50Chip(_ sender: UIButton) {
}
@IBAction func clearWager(_ sender: UIButton) {
}
@IBAction func deal(_ sender: UIButton) {
}
@IBAction func hit(_ sender: UIButton) {
}
@IBAction func stand(_ sender: UIButton) {
}
@IBAction func Next(_ sender: UIButton) {
}

▲ 新技巧 switch可省多次 if else 更簡潔，default 如無設定填 break 即可
➞按任一籌碼按鈕 count 皆 +1，而因 count 次數不同對應不同 case 反應
➞按 1 次出現 1 小籌碼圖，下注及總金額改變 (此只舉例 50 元籌碼按鈕)

@IBAction func bet50Chip(_ sender: UIButton) {
    switch count {
    case 0:
        first50ChipImage.isHidden = false
        plus50chip()
    default:
        second50ChipImage.isHidden = false
        plus50chip()
    }
}

▲ 如沒加第 2 個 func，餘額< 50 又反悔按 ⨂ 時會發現每個鈕都可按 😵

@IBAction func clearWager(_ sender: UIButton) {
    revisionOfTheChips()
    limitOfTotalAmount()
}

之後 Action都超長，註解在完整程式碼裡好了 !名稱取很完整應不難懂

▲ 其中 while 也是新學技巧還是註記一下
➞和 for in loop 不同處為無次數限定，依設定條件決定
➞條件沒設好的話，可能有無限循環或根本不會跑情況產生
➞此例為莊家點數未超過 16 點時莊家繼續加牌，但第 5 張出現後則停止
➞莊家第 3 張牌會因檯面上張數不同改變，因此 index-2 / -3 / -4皆有可能
➞如最後無 index += 1，此 while 就只會一直更換莊家第 3 張牌

while dealerPoint < 17 && dealerCardImage[4].isHidden == true {
 dealerCardImage[index-2].isHidden = false
 dealerCardImage[index-2].image = UIImage(named: cards[index+1].suit + cards[index+1].rank)
 dealerPoint += RankPoint(rank: cards[index+1].rank)
 dealerPointLabel.text = “\(dealerPoint)”
 index += 1
}

完整程式碼 + 後半段解釋
上半為 Card (struct)，下半為 ViewController

This is not Blackjack…

while, switch, 回傳東西的function, nested loop, struct, AVPlayerLooper, shuffle, array, alert…

Written by Monica