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Add note about singletons to OBJC_INTEROP.md

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SvyatoslavScherbina
2018-06-06 15:02:10 +03:00
committed by GitHub
parent 5219565c4d
commit 1afc5e5e90
1 changed files with 8 additions and 1 deletions
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OBJC_INTEROP.md
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@@ -32,7 +32,7 @@ The table below shows how Kotlin concepts are mapped to Swift/Objective-C and vi
| Extension | Extension | Category member | [note](#category-members) |
| `companion` member <- | Class method or property | Class method or property | |
| `null` | `nil` | `nil` | |
| `Singleton` | `Singleton()` | `[Singleton singleton]` | |
| `Singleton` | `Singleton()` | `[Singleton singleton]` | [note](#kotlin-singletons) |
| Primitive type | Primitive type / `NSNumber` | | [note](#nsnumber) |
| `Unit` return type | `Void` | `void` | |
| `String` | `String` | `NSString` | |
@@ -116,6 +116,13 @@ Members of Objective-C categories and Swift extensions are imported to Kotlin
as extensions. That's why these declarations can't be overridden in Kotlin.
And extension initializers aren't available as Kotlin constructors.
### Kotlin singletons
Kotlin singleton (made with `object` declaration, including `companion object`)
is imported to Swift/Objective-C as class with a single instance.
The instance is available through the factory method, i.e. as
`[MySingleton mySingleton]` in Objective-C and `MySingleton()` in Swift.
### NSNumber
While Kotlin primitive types in some cases are mapped to `NSNumber`