MiniBond

[](https://travis-ci.org/Ryo Kato/MiniBond)

What is MiniBond?

MiniBond is a very simple tool for reactive progamming in Swift using observer pattern.

The basic idea is came from SwiftBond https://github.com/SwiftBond/Bond

Usage

1. Create a EventProducer object with the argument that is the real object you want to observe the change. This argument is set to the EventProducer's value property.
2. Create an Observable object with a closure that is called when the EventProducer's value object changes.
3. Bind to the EventProducer with the Observable object by Observable.bindTo(EventProducer).
4. Then, when EventProducer's value object changes, the closure is called.

Here is a example usage you can find in the exemple project.

• EventProducer object is count.
• Observable object it countObservable.

class ViewController: UIViewController {
    let count = EventProducer<Int>(0)
    var countObservable: Observable<Int>?

    @IBOutlet weak var countLabel: UILabel!

    @IBAction func buttonPushed(sender: UIButton) {
        self.count.value += 1
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        countObservable = Observable<Int>{ [unowned self] eventProducer in
            self.countLabel.text = String(self.count.value)
        }
        countObservable?.bindTo(count)
    }
}

1. Create count that is an EventProducer with the argument 0. This integer is what you want to observe the change and set to count.value. In other words, count.value == 0
2. Create countObservable with the closure that changes the label with the number of self.count.value.
3. Bind to the count with the countObservable by countObservable.bindTo(count).
4. Then, when EventProducer's value object changes, the closure is called.

In the example, when buttonPushed is called, the number of self.count.value is increased, so the closure

{ [unowned self] eventProducer in
    self.countLabel.text = String(self.count.value)
}

is called.

[unowned self] is recommended since it prevents memory leak.

Example project

To run the example project, clone the repo, and run pod install from the Example directory first.

Requirements

Swift 1.2+

Installation

MiniBond is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod "MiniBond"

Author

katryo

License

MiniBond is available under the MIT license. See the LICENSE file for more info.