學習記錄#60 畫星星蘋果 — nested loop(巢狀迴圈)

目的: 學習使用 for 迴圈。

1. 從 segmented control 選擇形狀，有正方形，三角形，金字塔和菱形四種。
2. 從 slider 改變數量。
3. 畫 2 種 Apple，比方有紅色跟綠色。

正方形

//正方形
for _ in 1...number {
let star = number
let showstar = String(repeating: "⭐️", count: star)
showlabel = showlabel + showstar
showlabel = showlabel + "\n"
   }
label.text = showlabel
showslider.text = "\(number)"

另一種寫法

//正方形
for _ in 1...number {
       for _ in 1...number {
          showlabel = showlabel + "⭐️"
     }
          showlabel = showlabel + "\n"
}
label.text = showlabel
showslider.text = "\(number)"

三角形

///三角形
for i in 1...number  {
   for _ in 1...i {
showlabel = showlabel + "⭐️"
   }
showlabel = showlabel + "\n"
 }
label.text = showlabel
showslider.text = "\(number)"

金字塔

//金字塔
for i in 1...number {
let apple = number - i
let star = (i*2) - 1
let showapple = String(repeating: "🍎", count: apple)
let showstar = String(repeating: "⭐️", count:     star)
showlabel = showlabel + showapple + showstar
showlabel = showlabel + "\n"
label.text = showlabel
showslider.text = "\(number)"
}

菱形

//菱形
var apple:Int
var star:Int
for i in 1...number*2 - 1 {
   if i < number {
     star =  (i*2) - 1
     apple = number - i
    } else {
     star =  (number * 2 - i ) * 2 - 1
     apple =  i - number
  }
let showstar = String(repeating: "⭐️", count: star)
let showapple = String(repeating: "🍎", count: apple )
showlabel = showlabel + showapple + showstar
showlabel = showlabel + "\n"
label.text = showlabel
showslider.text = "\(number)"

倒三角

//倒三角
for i in 1...number  {
let star = number - i + 1
let showstar = String(repeating: "⭐️", count: star)
showlabel = showlabel + showstar
showlabel = showlabel + "\n"
}
label.text = showlabel
showslider.text = "\(number)"

正方形--將最後一行變成蘋果

//正方形劃底線
for i in 1...number {
  for _ in 1...number {
     if i == number {
showlabel = showlabel + "🍎"
                } else {
showlabel = showlabel + "⭐️"
                  }
     }
showlabel = showlabel + "\n"
  }
label.text = showlabel
showslider.text = "\(number)"

正方形 — 將斜線變成蘋果

//正方形劃斜線
for i in 1...number {
 for j in 1...number {
  if i + j == number + 1 {
showlabel = showlabel + "🍎"
  } else {
showlabel = showlabel + "⭐️"
    }
 }
showlabel = showlabel + "\n"
}
label.text = showlabel
showslider.text = "\(number)"

正方形 — 星星與蘋果交錯

//正方形圖案交錯
for i in 1...number {
   for j in 1...number {
       if i % 2 == 0 , j % 2 != 0 {
            showlabel = showlabel + "🍎"
     } else if  i % 2 == 1 , j % 2 != 1 {
            showlabel = showlabel + "🍎"
     } else {
            showlabel = showlabel + "⭐️"
        }
     }
            showlabel = showlabel + "\n"
}
  label.text = showlabel
  showslider.text = "\(number)"

完整程式Github

Chingwenluo/Nested-Loop

參考資料:

#60 畫星星蘋果

#28 畫星星蘋果 — nested loop(巢狀迴圈) 練習

#60 畫星星蘋果 — nested loop 練習