EventBox

EventBox is yet another notification library written in Swift.

Requirements

iOS 8+
Xcode 6.1

Installation

Create a Cartfile that lists the frameworks you’d like to use in your project.

$ echo 'github "s-aska/EventBox"' >> Cartfile

Run carthage update

$ carthage update

On your application targets’ “General” settings tab, in the “Embedded Binaries” section, drag and drop each framework you want to use from the Carthage.build folder on disk.

Usage

Minimum

EventBox.onMainThread(target, name: "reload") { _ in
    // UI
}

EventBox.onBackgroundThread(target, name:"reload") { _ in
    // API Access
}

EventBox.post("reload")

EventBox.off(target) // Remove all the observers of the target

EventBox.off(target, "reload") // Remove observers of the same name of the target

Handling the keyboard notifications

// MARK: - View Life Cycle

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)

    EventBox.onMainThread(self, name: UIKeyboardWillShowNotification, handler: { n in
        self.keyboardWillChangeFrame(n, showsKeyboard: true) })

    EventBox.onMainThread(self, name: UIKeyboardWillHideNotification, handler: { n in
        self.keyboardWillChangeFrame(n, showsKeyboard: false) })
}

override func viewDidDisappear(animated: Bool) {
    super.viewDidDisappear(animated)

    EventBox.off(self)
}

// MARK: - Keyboard Event Notifications

func keyboardWillChangeFrame(notification: NSNotification, showsKeyboard: Bool) {
    let userInfo = notification.userInfo!
    let animationDuration: NSTimeInterval = (userInfo[UIKeyboardAnimationDurationUserInfoKey] as NSNumber).doubleValue
    let keyboardScreenEndFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as NSValue).CGRectValue()

    if showsKeyboard {
        let orientation: UIInterfaceOrientation = UIApplication.sharedApplication().statusBarOrientation
        if (orientation.isLandscape) {
            containerViewButtomConstraint.constant = keyboardScreenEndFrame.size.width
        } else {
            containerViewButtomConstraint.constant = keyboardScreenEndFrame.size.height
        }
    } else {
        containerViewButtomConstraint.constant = 0
    }

    self.view.setNeedsUpdateConstraints()

    UIView.animateWithDuration(animationDuration, delay: 0, options: .BeginFromCurrentState, animations: {
        self.containerView.alpha = showsKeyboard ? 1 : 0
        self.view.layoutIfNeeded()
    }, completion: { finished in
        if !showsKeyboard {
            self.view.hidden = true
        }
    })
}

License

EventBox is released under the MIT license. See LICENSE for details.

mrkeng / EventBox