//
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// Copyright © 2018年 dahua. All rights reserved.
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// 定义一个参考的view、能根据keyboard能够，自动调整frame的视图
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import UIKit
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@objc public class DHAutoKeyboardView: UIView {
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/// 是否全屏界面，影响参考视图与键盘距离的计算
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public var isFullScreen: Bool = false
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/// 键盘关联的视图
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public weak var relatedView: UIView?
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/// 内部记录上次键盘的高度
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private var lastKeyboardHeight: CGFloat = 0
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override init(frame: CGRect) {
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super.init(frame: frame)
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self.addObserver()
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}
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required init?(coder aDecoder: NSCoder) {
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super.init(coder: aDecoder)
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self.addObserver()
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self.addTapGesture()
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}
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deinit {
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NotificationCenter.default.removeObserver(self)
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}
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func addObserver() {
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NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
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NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
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}
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func addTapGesture() {
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let tapGesture = UITapGestureRecognizer(target: self, action: #selector(tap))
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self.addGestureRecognizer(tapGesture)
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}
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override public func layoutSubviews() {
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super.layoutSubviews()
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}
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@objc func keyboardWillShow(notification: Notification) {
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guard relatedView != nil else {
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return
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}
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if let value = notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue {
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let keyboardFrame = value.cgRectValue
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lastKeyboardHeight = keyboardFrame.height
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keyboardShow(height: keyboardFrame.height)
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}
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}
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func keyboardShow(height: CGFloat, offset: CGFloat = 0) {
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//【*】参考视图与屏幕底部、键盘的距离计算
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var distanceToBottom = UIScreen.main.bounds.height - UIApplication.shared.statusBarFrame.height - self.relatedView!.frame.maxY
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if !isFullScreen {
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distanceToBottom -= 44
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}
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var transform: CGAffineTransform
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if distanceToBottom < height {
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transform = CGAffineTransform(translationX: 0, y: distanceToBottom - height - offset)
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} else {
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transform = CGAffineTransform.identity
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}
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UIView.animate(withDuration: 0.3, delay: 0, options: .curveEaseInOut, animations: {
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self.transform = transform
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}, completion: nil)
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}
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// MARK: - Auto Adjust
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/// 自动调整布局
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///
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/// - Parameter offset: 向上偏移尺寸，默认为0
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@objc func autoAdjust(offset: CGFloat = 0) {
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guard lastKeyboardHeight > 0 else {
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return
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}
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keyboardShow(height: lastKeyboardHeight, offset: offset)
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}
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//MAKR: - Notification
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@objc func keyboardWillHide(notification: Notification) {
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lastKeyboardHeight = 0
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guard relatedView != nil else {
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return
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}
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UIView.animate(withDuration: 0.3, delay: 0, options: .curveEaseInOut, animations: {
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self.transform = CGAffineTransform.identity
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}, completion: nil)
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}
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@objc func tap() {
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self.endEditing(true)
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}
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}
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