KeyboardObserver 2.1.0

KeyboardObserver 2.1.0

TestsTested
LangLanguage SwiftSwift
License MIT
ReleasedLast Release Nov 2018
SwiftSwift Version 4.2
SPMSupports SPM

Maintained by Naoki Morita.



KeyboardObserver

For less complicated keyboard event handling.

Carthage compatible

Features

  • Less complicated keyboard event handling.
  • Do not use Notification , but event .

Difference

Without KeyboardObserver.swift

let keyboardNotifications: [Notification.Name] = [
    .UIKeyboardWillShow,
    .UIKeyboardWillHide,
    .UIKeyboardWillChangeFrame,
]

override func viewDidLoad() {
    super.viewDidLoad()
}

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

    keyboardNotifications.forEach {
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardEventNotified:), name: $0, object: nil)
    }
}

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

    keyboardNotifications.forEach {
        NotificationCenter.default.removeObserver(self, name: $0, object: nil)
    }
}

@objc func keyboardEventNotified(notification: NSNotification) {
    guard let userInfo = notification.userInfo else { return }
    let keyboardFrameEnd = (userInfo[UIResponder.keyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
    let curve = UIView.AnimationCurve(rawValue: (userInfo[UIResponder.keyboardAnimationCurveUserInfoKey] as! NSNumber).intValue)!
    let options = UIView.AnimationOptions(rawValue: UInt(curve.rawValue << 16))
    let duration = TimeInterval(truncating: userInfo[UIResponder.keyboardAnimationDurationUserInfoKey] as! NSNumber)
    let bottom = keyboardFrameEnd.height - bottomLayoutGuide.length
    
    UIView.animate(withDuration: duration, delay: 0.0, options: [options], animations:
        { () -> Void in
            self.textView.contentInset.bottom = bottom
            self.textView.scrollIndicatorInsets.bottom = bottom
        } , completion: nil)
}

With KeyboardObserver

let keyboard = KeyboardObserver()

override func viewDidLoad() {
    super.viewDidLoad()

    keyboard.observe { [weak self] (event) -> Void in
        guard let self = self else { return }
        switch event.type {
        case .willShow, .willHide, .willChangeFrame:
            print("Fire: \(event.type)")
            let keyboardFrameEnd = event.keyboardFrameEnd
            let bottom = keyboardFrameEnd.height - self.bottomLayoutGuide.length
            
            UIView.animate(withDuration: event.duration, delay: 0.0, options: [event.options], animations: { () -> Void in
                self.textView.contentInset.bottom = bottom
                self.textView.scrollIndicatorInsets.bottom = bottom
                }, completion: nil)
        default:
            break
        }
    }
}

How to use

Create KeyboardObserver instance where you want, and the instance observes keyboard untill deinit.

Call observe(event: KeyboardEvent) to observe keyboard events. event is converted keyboard notification object.

public struct KeyboardEvent {
    public let type: KeyboardEventType
    public let keyboardFrameBegin: CGRect
    public let keyboardFrameEnd: CGRect
    public let curve: UIViewAnimationCurve
    public let duration: NSTimeInterval
    public var isLocal: Bool?

    public var options: UIViewAnimationOptions {
        return UIViewAnimationOptions(rawValue: UInt(curve.rawValue << 16))
    }
    ...

event has properties above. You don't have to convert Notification 's userInfo to extract keyboard event values.

KeyboardEentType has types same as keyboard's notification name. Like this below:

public enum KeyboardEventType {
    case willShow
    case didShow
    case willHide
    case didHide
    case willChangeFrame
    case didChangeFrame
    ...
}

It has also public var notificationName: String which you can get original notification name.

Runtime Requirements

  • iOS 8.0 or later
  • Xcode 10.0
  • Swift4.2

Installation and Setup

Information: To use KeyboardObserver with a project targeting lower than iOS 8.0, you must include the KeyboardObserver.swift source file directly in your project.

Installing with Carthage

Just add to your Cartfile:

github "morizotter/KeyboardObserver"

Installing with CocoaPods

CocoaPods is a centralised dependency manager that automates the process of adding libraries to your Cocoa application. You can install it with the following command:

$ gem update
$ gem install cocoapods
$ pods --version

To integrate KeyboardObserver into your Xcode project using CocoaPods, specify it in your Podfile and run pod install.

platform :ios, '8.0'
use_frameworks!
pod "KeyboardObserver", '~>2.0.0'

Manual Installation

To install KeyboardObserver without a dependency manager, please add KeyboardObserver.swift to your Xcode Project.

Contribution

Please file issues or submit pull requests for anything you’d like to see! We're waiting! :)

License

KeyboardObserver.swift is released under the MIT license. Go read the LICENSE file for more information.