Hi all. I'm a little confused. According to <swift...

# ios

[xxfast]

Hi all. I'm a little confused. According to swift-interopedia `Boolean` should be mapped to Bool, but on my end i'm seeing KotlinBoolean

__attribute__((swift_name("KotlinBoolean")))
@interface AppBoolean : AppNumber
- (instancetype)initWithBool:(BOOL)value;
+ (instancetype)numberWithBool:(BOOL)value;
@end

Does anyone know why? 🤔

[curioustechizen]

In my experience, I see this:

• If I have a Kotlin property or function that returns a Boolean and is consumed by Swift, then Swift sees it as a Bool
• If I have a Kotlin property or function that I want Swift to implement, then the return type becomes KotlinBoolean
Not sure if this is intended.

[curioustechizen]

So, let's say I have this:

//Kotlin
data class MyUiState(
    val name: String,
    val loggedIn: Boolean
)

Then I can do this

// Swift
if myUiState.loggedIn {
    doSomething()
}

[curioustechizen]

However, if I have this interface

// Kotlin
interface UserRepository {
    fun getName(): String
    fun isLoggedIn(): Boolean
}

Then I need to implement it like this in Swift. Notice how the return type of isLoggedIn became KotlinBoolean

// Swift implementation
class IosUserRepository: UserRepository {
    func getName() -> String {
        return "John Doe"
    }

    func isLoggedIn() -> KotlinBoolean {
        let loggedIn = figureItOut()
        return KotlinBoolean(bool: loggedIn)
    }
}

[curioustechizen]

Also, Swift usages of this function need to chain the .boolValue at the end:

// Swift usage
let userRepository = IosUserRepository()
if userRepository.isLoggedIn().boolValue {
    doSomething()
}

[xxfast]

yeah you are right. I'm wondering if this is documented somwhere. I also wonder why it works this way 🤔