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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) | | Extension | Extension | Category member | [note](#category-members) |
| `companion` member <- | Class method or property | Class method or property | | | `companion` member <- | Class method or property | Class method or property | |
| `null` | `nil` | `nil` | | | `null` | `nil` | `nil` | |
| `Singleton` | `Singleton()` | `[Singleton singleton]` | | | `Singleton` | `Singleton()` | `[Singleton singleton]` | [note](#kotlin-singletons) |
| Primitive type | Primitive type / `NSNumber` | | [note](#nsnumber) | | Primitive type | Primitive type / `NSNumber` | | [note](#nsnumber) |
| `Unit` return type | `Void` | `void` | | | `Unit` return type | `Void` | `void` | |
| `String` | `String` | `NSString` | | | `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. as extensions. That's why these declarations can't be overridden in Kotlin.
And extension initializers aren't available as Kotlin constructors. 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 ### NSNumber
While Kotlin primitive types in some cases are mapped to `NSNumber` While Kotlin primitive types in some cases are mapped to `NSNumber`