快速初始化可选和非可选的初始化？

Question

https://github.com/Hearst-DD/ObjectMapper requires me to have

 required init?(_ map: Map){
 }

I'd like to instantiate Foo() but it is Foo? type not Foo.

I added the following initializer but no avail.

 override init() {
 }

Answer 1

Take the Foo?, check if it has a value, and then unwrap it.

let ff : Foo? = Foo()
if ff != nil {
    let f : Foo = f!
    // ...
}

Or more simply:

let ff = Foo()
if let f = ff {
    // ...
}

Answer 2

** edit ** Sorry for the false call..

I had problem with the below code.

 var foo = Mapper<Foo>().map(jsonString)
 if foo != nil {
     return foo!
 }

 foo = Foo()
 return foo

I think the problem is when i declared var foo it's declared as Foo? type and foo = Foo() is still Foo?

so I changed the code to

 var foo = Mapper<Foo>().map(jsonString)
 if foo != nil {
     return foo!
 }

 return Foo()

and it seems working.