• How to input special symbol in Xcode/Macos

    • Press Command + Control + Space to call out symbol keyboard
    • Choose from the symobls

  • What does init(coder:) do

    • It is actually part of Protocol NSCoding
    • NSCoding has two methods
      • encdoe(coder:)
        • Save what you config in xib or storyboard to disk
      • init(coder:)
        • Generate Instance of your view from disk
    • If you don’t use xib or storyboard
      • Just input fatalerror(error)