在昨天談完Day17:如何使用if......else...來做匯率換算App後,接下來我們可以參考

Stanford(史丹佛大學)iOS課程裡提到的Concentration App ,

做一款翻牌記憶遊戲

翻牌記憶遊戲App運做講解:

1 翻出兩張一樣的牌後，翻下一張牌時，兩張一樣的牌會消失。

2 翻出兩張不同的牌後，翻下一張牌時，那兩張不同的牌會再度蓋起來。

Stanford 課程範例連結

1.接下來我們就參考Stanford iOS App GitHub來實做一個有趣的App ，打開Xcode

建立新的專案

2.按+新增Label , ImageView.......

3.撰寫程式邏輯

import UIKit

class ViewController: UIViewController {
    
    var flipCount = 0 {
        didSet {
            flipCountLabel.text = "Flips: \(flipCount)"
        }
    }
    
    @IBOutlet var cardButtons: [UIButton]!
    
    @IBOutlet weak var flipCountLabel: UILabel!
    
    var emojiChoices = ["?", "?", "?", "?"]
    
    @IBAction func touchCard(_ sender: UIButton) {
        for button in cardButtons {
            button.setTitle("", for: UIControlState.normal)
            button.backgroundColor = #colorLiteral(red: 1, green: 0.5763723254, blue: 0, alpha: 1)
        }
        flipCount += 1
        if let cardNumber = cardButtons.index(of: sender) {
            flipCard(withEmoji: emojiChoices[cardNumber], on: sender)
        } else {
            print("choosen card was not in cardButtons")
        }
    }

    func flipCard(withEmoji emoji: String, on button: UIButton) {
        if button.currentTitle == emoji {
            button.setTitle("", for: UIControlState.normal)
            button.backgroundColor = #colorLiteral(red: 1, green: 0.5763723254, blue: 0, alpha: 1)
        } else {
            button.setTitle(emoji, for: UIControlState.normal)
             button.backgroundColor = #colorLiteral(red: 1, green: 1, blue: 1, alpha: 1)
        }
    }
}

4.執行iPhone 11 Pro Max模擬器執行有趣遊戲的App