KeyboardUtility

iOS keyboard frame real-time tracking. Support interactive keyboard dismissal and iPad undock keyboard.

See demo video on YouTube: https://youtu.be/w3BKTFrxs4I

Requirement

• Xcode 9.0
• Swift 4.0
• iOS 9.0+ for auto keyboard frame observation with UILayoutGuide
• iOS 8.0+ for manual keyboard frame observation

Usage

Auto keyboard frame observation with UILayoutGuide:

let keyboardLayoutGuide = KeyboardLayoutGuide()
view.addLayoutGuide(keyboardLayoutGuide)

// place a text field on top of the keyboard using auto layout
let textField = UITextField()
textField.borderStyle = .roundedRect
view.addSubview(textField)

textField.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
    textField.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 8),
    view.trailingAnchor.constraint(equalTo: textField.trailingAnchor, constant: 8),
    keyboardLayoutGuide.topAnchor.constraint(equalTo: textField.bottomAnchor, constant: 8),
])

Manual keyboard frame observation:

// Strong reference the observer to make sure keyboard frame keep update to date.
// Will stop observation automatically when deinit.
var keyboardFrameObserver: KeyboardFrameObserver?

/// make keyboard backgroud red.
func setupKeyboardHighlightView() {
    let frame = CGRect(x: 0, y: view.bounds.height, width: view.bounds.width, height: 0) // setup inital frame to avoid weird animation
    let keyboardHighlightView = UIView(frame: frame)
    
    keyboardHighlightView.backgroundColor = .red
    view.addSubview(keyboardHighlightView)
    
    keyboardFrameObserver = KeyboardFrameObserver(view: view) { [weak keyboardHighlightView] frame, animated in
        // the frame is related to view
        keyboardHighlightView?.frame = frame
    }
}

Limitation

KeyboardLayoutGuide is not supported on UIScrollView, which means you must add it to a non-scrollable view. E.g. If you want to track keyboard frame in a UITableViewController, do not add it to tableView, instead, try add it to navigationController.view.

Installation

1. Download KeyboardUtility
2. Create a new Swift Cocoa Touch Framework in your project and name it KeyboardUtility
3. Drag 4 files KeyboardUtility.h, KeyboardFrameObserver.swift, KeyboardFrameObserversManager.swift and KeyboardLayoutGuide.swift from KeyboardUtility into the new KeyboardUtility folder that Xcode create for you
4. Add the new framework as your other target's Linked Frameworks and Libraries
5. import KeyboardUtility

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License - MIT

Copyright (c) 2017 Junyu Kuang

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.