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TextInputAccessoryView.swift
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101 lines (79 loc) · 2.96 KB
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//
// TextInputAccessoryView.swift
// TextInputBar
//
// Created by Aryan Ghassemi on 8/16/15.
// Copyright © 2015 Aryan Ghassemi. All rights reserved.
//
// https://github.com/aryaxt/TextInputBar
//
// 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.
import UIKit
@objc protocol TextInputAccessoryViewDelegate {
func textInputAccessoryView(didChnageToFrame rect: CGRect)
}
class TextInputAccessoryView: UIView {
weak var delegate: TextInputAccessoryViewDelegate!
private var isObserving = false
private let keyPathsToObserve = ["frame", "center"]
private let myContext = UnsafeMutablePointer<()>()
// MARK: - Initialization -
override init(frame: CGRect) {
super.init(frame: frame)
userInteractionEnabled = false
backgroundColor = UIColor.clearColor()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
deinit {
removeObserversIfNeeded()
}
// MARK: - UIView Methods -
override func layoutSubviews() {
super.layoutSubviews()
if let superview = superview {
delegate.textInputAccessoryView(didChnageToFrame: superview.frame)
}
}
override func willMoveToSuperview(newSuperview: UIView?) {
removeObserversIfNeeded()
for path in keyPathsToObserve {
newSuperview?.addObserver(self, forKeyPath: path, options: .New, context: myContext)
}
isObserving = true
super.willMoveToSuperview(newSuperview)
}
// MARK: - Private -
func removeObserversIfNeeded() {
if isObserving {
for path in keyPathsToObserve {
superview?.removeObserver(self, forKeyPath:path)
}
}
}
// MARK: - KBO -
override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>) {
if let keyPath = keyPath,
let superview = superview
where object === superview && keyPathsToObserve.contains(keyPath) {
delegate.textInputAccessoryView(didChnageToFrame: superview.frame)
}
}
}