Eluss

func performHeartBeat(sender: UIButton) {
    let imageView = UIImageView(frame: self.heartButton.frame)
    imageView.image = UIImage(named: "heart_border")
    self.view.addSubview(imageView)
    
    UIView.animateWithDuration(0.5, animations: { () -> Void in
        imageView.transform = CGAffineTransformMakeScale(3,3)
        imageView.alpha = 0
        }) { (completed) -> Void in
            imageView.removeFromSuperview()

Eluss

private func setupButton() {
    let heartImage = UIImage(named: "heart")
    self.heartButton = UIButton(frame: CGRectZero)
    self.heartButton.frame.size = CGSizeMake(heartImage!.size.width, heartImage!.size.height)
    self.heartButton.center = self.view.center
    self.heartButton.setImage(heartImage, forState: .Normal)
    self.heartButton.addTarget(self, action: "performHeartBeat:", forControlEvents: .TouchUpInside)
    self.view.addSubview(self.heartButton)
}

Eluss

signal.skipRepeats().observeNext {(value) -> () in
	// print values that are not duplicates of the immedately preceding value
	print(value)
}

signal.observeNext {(value) -> () in
	// values without transformations
	print(value)
}

Eluss

// creating a signal
let (signal, sink) = Signal<Int, NoError>.pipe()

// function called when button is tapped
func buttonTapped(sender: UIButton) {
	// sending random value down the stream
	sendNext(sink, random() % 3)
}

// somewhere in the application

Eluss

let producer = countToValue(5)
producer.startWithSignal { (observer, disposable) -> () in
    observer.observeNext({ (number) -> () in
        print(number)
    })
    observer.observeCompleted({ () -> () in
        print("I'm done counting")
    })
}

Eluss

func countToValue(value: Int) -> SignalProducer<Int, NoError> {
    return SignalProducer { (sink, disposable) -> () in
        for i in 0...value {
            sendNext(sink, i)
        }
        sendCompleted(sink)
    }
}

Eluss

bankAccountBalance.producer.startWithSignal { (observer, disposable) -> () in
    observer.observeNext({ (value) -> () in
        print(value)
    })
    observer.observeCompleted({ () -> () in
        print("completed")
    })
}

Eluss

bankAccountBalance.producer.startWithSignal { (signal, disposable) -> () in
    signal.observeNext({ (value) -> () in
        print(value)
    })
    signal.observeCompleted({ () -> () in
        print("completed")
    })
}

Eluss

bankAccountBalance.producer.startWithSignal { (signal, disposable) -> () in
    signal.observeNext({ (value) -> () in
        print(value)
    })
}

Eluss

var bankAccountBalance = MutableProperty<Double>(100)