Understanding Swift: for C and C++ Programmers while having to learn as little Object-C as possible by David Francis Curran

Author:David Francis Curran [Curran, David Francis]
Language: eng
Format: azw3
Publisher: D F Curran Productions
Published: 2016-01-10T16:00:00+00:00

You will get an error asking you to unwrap MyInt(rawValue:0)

Fixing it will add a !

Lets go back and look at:

var myNewBubble = MyInt( rawValue: 3)

again. This does NOT need a ! to unwrap it. As its value is nil and unwrapping it would create an error.

(Figure 13.11 There is no 3 so unwrapping it causes an error.)

Next we will try

var myNextNewBubble = MyInt(rawValue: nil) //Fails saying the expected value after rawValue has to be an Int.

So keep in mind with an enum like

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