Must call a designated initializer of the superclass

  • 即係講到尾, subclass 想 call super.init 唔可以 call 佢個d convenience 只能 call 基本 init

  • 基本 init 又可以有好多個 , 你要 superclass 佢, 就要 required 晒佢~

    class NoteMessage: Message { let content: String

    init(content: String, theUser: String)
    {
        self.content = content
        super.init(sender: theUser)
        //Error!:  Must call a designated initializer of the superclass 'Message'
    }
}

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