References to Swift Programming Tips

Links for swift programming I referenced are as follows.

• Loops
  1. 【Swift】繰り返し処理（for-in、while、repeat-while）
• Switch
  1. SwiftにおけるSwitchまとめ
• ConVert CGFloat to String
  1. Converting CGFloat to String in Swift
• Function
  1. Swiftの値型と参照型、値渡しと参照渡し
  2. Swiftの関数の基本的な取り扱い
• How to Draw Circle
  1. Swiftの円と円弧の描き方