https://github.com/magic003/objc

V bindings to Objective-C runtime.
https://github.com/magic003/objc

bindings objective-c vlang vlang-package

Last synced: about 2 months ago
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V bindings to Objective-C runtime.

• Host: GitHub
• URL: https://github.com/magic003/objc
• Owner: magic003
• License: mit
• Created: 2023-08-30T13:55:51.000Z (about 1 year ago)
• Default Branch: main
• Last Pushed: 2024-07-12T05:17:45.000Z (2 months ago)
• Last Synced: 2024-07-12T06:31:38.117Z (2 months ago)
• Topics: bindings, objective-c, vlang, vlang-package
• Language: V
• Homepage:
• Size: 983 KB
• Stars: 6
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

Awesome Lists containing this project

• awesome-v - objc - V bindings to Objective-C runtime. (Libraries / Utility)

README

        
This vlang package provides Objective-C Runtime bindings for V.

## Status

It is currently work in progress and should be considered experimental. It's tested on 

x86\_64 and arm64 (Apple Silicon) architectures, macOS Sonoma 14.5.

Supported features:

* Bool type

* Id type

* Load classes

* Create instances

* Register selectors

* Send messages (varargs are not supported)

* Class declaration

## Installation

```shell

v install magic003.objc

```

## Usage

### Bool type

The `Bool` type is an alias of the V `bool` type.

```v

assert objc.yes == true

assert objc.no == false

```

### Load a class

An Objective-C class can be loaded using either a factory function or a static type method.

```v

cls1 := objc.Class.get('NSMutableArray') or { panic('failed to load class NSMutableArray') }

cls2 := objc.class('NSMutableArray') or { panic('failed to load class NSMutableArray') }

```

### Register and get a selector

An Objective-C selector can be registered using either a factory function or a static type method.

```v

s1 := objc.Sel.get('init')

s2 := objc.sel('init')

```

### Send messages

Messages can be sent to a class or an instance. There are two types of messages:

* `request[R]()`: a message with return type `R`.

* `notify()`: a message without a return value.

```v

unsafe {

    // a mutable array instance is created via chained messages

    arr := cls1.message(objc.sel('alloc')).request[objc.Id]()

            .message(objc.sel('init')).request[objc.Id]()

    // load the NSObject class and create an instance

    obj_cls := objc.class('NSObject') or { panic('failed to load class NSObject') }

    obj := obj_cls.message(sel('new')).request[objc.Id]()

    // add an object to the array. Message with one argument and no return value. 

    // Use `args2()`, `args3()` and etc for more arguments.

    arr.message(sel('addObject:')).args1(obj).notify()

    // message without an argument.

    size := arr.message(sel('count')).request[u64]()

    assert size == 1

}

```

### Declare a new class

New classes can be declared and registered with the Objective-C Runtime.

```v

superclass := objc.class('NSObject') or { panic('failed to load class NSObject') }

// create a new class with `NSObject` as the super class.

decl := ClassDecl.new(superclass, 'NewClass', 0) or {

    panic('failed to create class NewClass')

}

// add ivars

decl.add_ivar[i64]('num')

decl.add_ivar[objc.Id]('obj')

// add methods

m1 := objc.void_method_1[bool](fn (self objc.Id, cmd objc.Sel, flag bool) {

    // do something

})

unsafe { decl.add_method(objc.sel('method1:'), m1) }

m2 := objc.method_1[int, objc.Id](fn (self objc.Id, cmd objc.Sel, obj objc.Id) int {

    return 10

})

unsafe { delc.add_method(objc.sel('method2:'), m2) }

// register the class

cls := decl.register()

unsafe {

    // create an instance from the new class

    obj := cls.message(objc.sel('new')).request[objc.Id]()

    

    // set ivar

    obj.set_ivar('num', 1)

    // call method

    obj.message(objc.sel('method1:')).args1(true).notify()

}

```

## Examples

The unit tests have basic usages.

Check out the `examples` folder for more examples. 

## Documentation

* API Documentation: http://magic003.github.io/objc

* Why this project: [V and Objective-C interoperability](https://open.substack.com/pub/insideout101/p/v-and-objective-c-interoperability?r=2rxz0s&utm_campaign=post&utm_medium=web)

## References

* [Programming with Objective-C](https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC) 

* [Objective-C Runtime APIs](https://developer.apple.com/documentation/objectivec?language=objc)

* [rust-objc](https://github.com/SSheldon/rust-objc): Objective-C bindings for Rust.