#12 — nested loop(巢狀迴圈) 練習&Swift 的九九乘法 App

呈現畫面：

此篇內容只是因為我單純不太熟悉巢狀迴圈而做的練習，所以做的蠻簡陋的，老實說幾乎都是看著解答或參考別人文章才知道怎麼做，不多說直接附上解答XD

viewDidLoad()裡先加入以下（字如果超出範圍會自動縮小調整）

showLabel.adjustsFontSizeToFitWidth = true

直角三角形

func rightTriangle(){
        showLabel.textAlignment = .natural
        var text = ""
        let num = Int(sliderOutlet.value)
        for i in 1...num{
            for _ in 1...i{
                text += "🐽"
            }
            text += "\n"
        }
        showLabel.text = text
        numberLabel.text = "\(num)"
    }

正方形

func square(){
        var text = ""
        let num = Int(sliderOutlet.value)
        for _ in 1...num{
            for _ in 1...num{
                text += "🐽"
            }
            text += "\n"
        }
        showLabel.text = text
        numberLabel.text = "\(num)"
    }

金字塔

func pyramind(){
        showLabel.textAlignment = .center
        var text = ""
        let num = Int(sliderOutlet.value)
        for i in 1...num{
            for _ in 1...i{
                text += "🐽"
            }
            text += "\n"
        }
        showLabel.text = text
        numberLabel.text = "\(num)"
    }

菱形

func diamond(){
        showLabel.textAlignment = .center
        var text = ""
        let num = Int(sliderOutlet.value)
        var pigCount = 1
        for i in 1...(num*2-1){
            for _ in 1...pigCount{
                text += "🐽"
            }
            if i < num {
                pigCount += 2
            }else{
                pigCount -= 2
            }
            text += "\n"
        }
        showLabel.text = text
        numberLabel.text = "\(num)"
    }

九九乘法（包含0）

func ninetyNine(){
        var text = ""
        let num = Int(sliderOutlet.value)
        for i in 0...9{
            for x in 0...num{
                if i == 0 {
                    text += "\(x)\t"
                }else if x == 0{
                    text += "\(i)\t"
                }else{
                    text += "\(x*i)\t"
                }
            }
            text += "\n"
        }
        showLabel.text = text
        numberLabel.text = "\(num)"
    }

參考資料：

#60 畫星星蘋果

畫星星蘋果多邊形 — nested loop(巢狀迴圈) 範例參考

九九乘法app是利用亂數出題，比較特別的是亂數有可能得到相同得數字，所以這邊我利用了repeat-while防止選擇的數字重複，再用空陣列加上shuffle()去裝選項就可以完成了。

func randomQuestion(){
        let randomNum1 = Int.random(in: 2...9)
        let randomNum2 = Int.random(in: 2...9)
        questionLabel1.text = "\(randomNum1)"
        questionLabel2.text = "\(randomNum2)"
        
        var answerNum1 = Int.random(in: 4...81)
        var answerNum2 = Int.random(in: 4...81)
        //設定不會有同樣答案選項
        repeat {
            answerNum1 = Int.random(in: 4...81)
            answerNum2 = Int.random(in: 4...81)
        } while rightAnswer == answerNum1 || rightAnswer == answerNum2
        rightAnswer = randomNum1*randomNum2
       
        var answerArray = [answerNum1,answerNum2,rightAnswer]
        //陣列隨機洗牌
        answerArray.shuffle()
        print(answerArray)
        for num in 0...answerArray.count-1{
            answerOutlets[num].setTitle("\(answerArray[num])", for: .normal)
        }
    }

參考資料：

#58 Swift 的九九乘法 App

GitHub網址：

GitHub - casper41807/ninetyNineMultiplication