ARNEventEmitter

I aimed at the implementation of Node.js EventEmmiter.

and KVO.

Respect

It was inspired by the following products.

• jerolimov/EventEmitter

• KXEventEmitter

• ReactiveCocoa

Requirements

Requires iOS 5.0 or later, and uses ARC.

How To Use

emitterOn

object A (On)

    [[self class] arn_emitterOn:@"test" owner:self needMainThreadCall:YES callbackBlock:^(id resultObject){
        // called MianThread
        NSLog(@"A");
    }];

object B (On)

  [[self class] arn_emitterOn:@"test" owner:self needMainThreadCall:NO callbackBlock:^(id resultObject){
      // called  not MianThread
      NSLog(@"B");
  }];

object C (Emit)

  [[self class] arn_emitterEmit:@"test" resultObject:nil];
  // called objectA emitterOn
  // called objectB emitterOn

  [[self class] arn_emitterEmit:@"test" resultObject:nil];
  // called objectA emitterOn
  // called objectB emitterOn

emitterOnce

object A (On)

    [[self class] arn_emitterOn:@"test" owner:self needMainThreadCall:YES callbackBlock:^(id resultObject){
        // called MianThread
        NSLog(@"A");
    }];

object B (Once)

  [[self class] arn_emitterOnce:@"test" owner:self needMainThreadCall:NO callbackBlock:^(id resultObject){
      // called  not MianThread
      NSLog(@"B");
  }];

object C (Emit)

  [[self class] arn_emitterEmit:@"test" resultObject:nil];
  // called objectA emitterOn
  // called objectB emitterOnce

  [[self class] arn_emitterEmit:@"test" resultObject:nil];
  // called objectA emitterOn

emitterOff

object A (On)

    [[self class] arn_emitterOn:@"test" owner:self needMainThreadCall:YES callbackBlock:^(id resultObject){
        // called MianThread
        NSLog(@"A");
    }];

object B (Off)

  [[self class] arn_emitterOnce:@"test" owner:self needMainThreadCall:NO callbackBlock:^(id resultObject){
      // called  not MianThread
      NSLog(@"B");
      [self class] arn_emitterOff:@"test" owner:self];
  }];

object C (Emit)

  [[self class] arn_emitterEmit:@"test" resultObject:nil];
  // called objectA emitterOn
  // called objectB emitterOn

  [[self class] arn_emitterEmit:@"test" resultObject:nil];
  // called objectA emitterOn

Key-Value Observing

Attention!!

Use exchange Implementations by the following

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context

KVO

  MyObject *objA = MyObject.new;
  MyObject *objB = MyObject.new;

  objA.count = 0;
  objB.count = 0;

  [objA arn_emitterObserve:objB keyPath:@"count" isOnce:NO needMainThreadCall:NO callbackBlock:^(id resutObject) {
        objA.count++;
  }];

  objB.count++;
  // call arn_emitterObserve

  objB.count++;
  // call arn_emitterObserve

  // objA.count == 2

Licensing

The source code is distributed under the nonviral MIT License.

It's the simplest most permissive license available.

Japanese Note

Node.js界隈で広く使われているEventEmitterオブジェクトをObjective-Cで実装したものです。

（Node.jsのEventEmitterオブジェクトと同一の機能を有しているわけではありません）