import UIKit
class ViewController: UIViewController {
let SCREENW = UIScreen.main.bounds.width
let SCREENH = UIScreen.main.bounds.height
var commentBtn:UIButton!
var inputLineView:UIView!
var inputTextView:UITextView!
var layView:UIView?
var changeY:CGFloat!
var keyboardDuration:Double!
override func viewDidLoad() {
super.viewDidLoad()
//注册键盘的监听
let notiCenter = NotificationCenter.default
notiCenter.addObserver(self, selector: #selector(keyBoardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
notiCenter.addObserver(self, selector: #selector(keyBoardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
//评论按钮
commentBtn = UIButton(frame: CGRect(x: 100, y: 100 , width: 100, height: 100))
commentBtn.setTitle("Comment", for: .normal)
commentBtn.setTitleColor(UIColor.white, for: .normal)
commentBtn.backgroundColor = UIColor.blue
commentBtn.addTarget(self, action: #selector(CommentBtnClick), for: .touchUpInside)
view.addSubview(commentBtn)
}
func keyBoardWillShow(notifction:NSNotification){
let kbInfo = notifction.userInfo
//获取键盘的size
let kbRect = (kbInfo?[UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
//键盘的y偏移量
changeY = kbRect.origin.y - SCREENH
//键盘弹出的时间
keyboardDuration = kbInfo?[UIKeyboardAnimationDurationUserInfoKey] as! Double
//界面偏移动画
UIView.animate(withDuration: keyboardDuration) {
self.inputLineView.transform = CGAffineTransform(translationX: 0, y: self.changeY - self.inputLineView.frame.height)
}
}
func keyBoardWillHide(notifction:NSNotification){
UIView.animate(withDuration: 0.25) {
self.inputLineView.transform = CGAffineTransform(translationX: 0, y: self.SCREENH)
self.layView?.isHidden = true
}
}
func CommentBtnClick(){
if inputLineView == nil{
inputLineView = UIView(frame: CGRect(x: 0, y: SCREENH , width: SCREENW, height: 50))
inputLineView.backgroundColor = UIColor.cyan
view.addSubview(inputLineView)
inputTextView = UITextView(frame: CGRect(x: 3, y: 3, width: SCREENW - 6, height: 44))
inputTextView.layer.borderColor = UIColor.darkGray.cgColor
inputTextView.layer.borderWidth = 1
inputLineView.addSubview(inputTextView)
inputTextView.becomeFirstResponder()
} else {
inputTextView.becomeFirstResponder()
}
if layView == nil{
self.layView = UIView(frame: self.view.frame)
layView?.backgroundColor = UIColor.gray
layView?.alpha = 0.5
let tap = UITapGestureRecognizer(target: self, action: #selector(tapLayView))
layView?.addGestureRecognizer(tap)
self.view.insertSubview(layView!, belowSubview: inputLineView!)
} else {
layView?.isHidden = false
}
}
//点击layView，收回键盘
func tapLayView(){
self.inputTextView.resignFirstResponder()
}
}