This time we take a look at a few lessons in succession before mentioned，We had初见 OPEN In a development with a mobile phone (system) to describe inherited this thing chestnuts，I believe we have the impression。
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class CellPhone { func call() { print("Call someone!") } func powerUp () { print("Welcome!") } func powerDown() { print("Goodbye~") } func sendMessage() { print("sent a Message!") } } |
Inheritance
So this lesson we will learn to understand the depth of the concept of inheritance。
This is actually not difficult to understand，You see，when[……]
