看过小编前面的文章的小伙伴们应该已经发现了，在UITextField中，小编简单的介绍过一丢丢关于UIKeyboard的键盘类型。在这篇文章中，我们来详细的看一下UIKeyboard的相关知识吧。
一、键盘的相关属性
1.键盘8种类型
textF.keyboardType = UIKeyboardType.Default //系统默认的虚拟键盘
textF.keyboardType = UIKeyboardType.ASCIICapable //显示英文字母的虚拟键盘
textF.keyboardType = UIKeyboardType.NumbersAndPunctuation //显示数字和标点的虚拟键盘
textF.keyboardType = UIKeyboardType.URL //显示便于输入数字的虚拟键盘
textF.keyboardType = UIKeyboardType.NumberPad //显示便于输入数字的虚拟键盘
textF.keyboardType = UIKeyboardType.PhonePad //显示便于拨号呼叫的虚拟键盘
textF.keyboardType = UIKeyboardType.NamePhonePad //显示便于聊天拨号的虚拟键盘
textF.keyboardType = UIKeyboardType.EmailAddress //显示便于输入Email的虚拟键盘
textF.keyboardType = UIKeyboardType.DecimalPad //显示用于输入数字和小数点的虚拟键盘
textF.keyboardType = UIKeyboardType.Twitter //显示方便些Twitter的虚拟键盘
textF.keyboardType = UIKeyboardType.WebSearch //显示便于在网页上书写的虚拟键盘
2.键盘的外观
textF.keyboardAppearance = .Default //默认外观：浅灰色
textF.keyboardAppearance = .Dark //黑色
textF.keyboardAppearance = .Light //亮色，与Default很相似
3.键盘的回车键
textF.returnKeyType = .Default //默认：灰色按钮，标有Return
textF.returnKeyType = .Continue // 标有Continue的蓝色按钮
textF.returnKeyType = .Done //标有Done的蓝色按钮
textF.returnKeyType = .EmergencyCall //紧急呼叫按钮
textF.returnKeyType = .Go //标有Go的蓝色按钮
textF.returnKeyType = .Google //标有Google的蓝色按钮，用于搜索
textF.returnKeyType = .Join //标有Join的蓝色按钮
textF.returnKeyType = .Next //标有Next的蓝色按钮
textF.returnKeyType = .Route //标有Route的蓝色按钮
textF.returnKeyType = .Search //标有Search的蓝色按钮
textF.returnKeyType = .Send //标有Send的蓝色按钮
textF.returnKeyType = .Yahoo //标有Yahoo!的蓝色按钮，用于搜索
4.键盘的大写属性
textF.autocorrectionType = .Default //默认
textF.autocorrectionType = .No //不自动更正
textF.autocorrectionType = .Yes //自动更正
5.安全性
当我们想输入密码的时候当然需要安全显示啦，键盘也为我们提供了这样一个属性。
textF.secureTextEntry = true
二、键盘的事件分析
class ViewController: UIViewController,UITextFieldDelegate {
var textField:UITextField?
//Mark:life cycle
override func viewDidLoad() {
super.viewDidLoad()
textField = UITextField(frame: CGRectMake(50, 50, 150, 30))
textField?.backgroundColor = UIColor.cyanColor()
textField?.textColor = UIColor.blackColor()
textField?.placeholder = "请输入用户名"
textField?.delegate = self
view.addSubview(textField!)
}
override func viewWillDisappear(animated: Bool) {
if self.textField != nil {
let center = NSNotificationCenter.defaultCenter()
center.removeObserver(self, name: UIKeyboardWillShowNotification, object: nil)
center.removeObserver(self, name: UIKeyboardWillHideNotification, object: nil)
}
}
//Mark:Delegate
func textFieldDidBeginEditing(textField: UITextField) {
//监听键盘弹出通知
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(ViewController.keyboardWillShow(_:)), name: UIKeyboardWillShowNotification, object: nil)
//监听键盘收回通知
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(ViewController.keyboardWillHide(_:)), name: UIKeyboardWillHideNotification, object: nil)
}
func textFieldDidEndEditing(textField: UITextField) {
self.view.endEditing(true)
}
//键盘显示
func keyboardWillShow(notification:NSNotification) {
let textMaxY = CGRectGetMaxY(self.textField!.frame)
let keyboardH : CGFloat = (notification.userInfo![UIKeyboardFrameEndUserInfoKey]?.CGRectValue.size.height)!
let keyboardY : CGFloat = self.view.frame.size.height - keyboardH
var duration = notification.userInfo![UIKeyboardAnimationDurationUserInfoKey]?.doubleValue
if duration < 0.0 {
duration = 0.25
}
UIView.animateWithDuration(duration!) { () -> Void in
if (textMaxY > keyboardY) {
self.view.transform = CGAffineTransformMakeTranslation(0, keyboardY - textMaxY - 10)
}else{
self.view.transform = CGAffineTransformIdentity
}
}
}
//键盘隐藏
func keyboardWillHide(notification:NSNotification){
let duration = notification.userInfo![UIKeyboardAnimationDurationUserInfoKey]?.doubleValue
UIView.animateWithDuration(duration!) { () -> Void in
self.view.transform = CGAffineTransformIdentity
}
}
}
实现方法二：
func keyboardWillShow(note: NSNotification) {
let userInfo = note.userInfo!
let keyBoardBounds = (userInfo[UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
let duration = (userInfo[UIKeyboardAnimationDurationUserInfoKey] as! NSNumber).doubleValue
let deltaY = keyBoardBounds.size.height - 200
let animations:(() -> Void) = {
if deviceTypeIphone5() {
//键盘的偏移量
self.textView.transform = CGAffineTransform(translationX: 0 , y: -deltaY)
}
}
if duration > 0 {
let options = UIViewAnimationOptions(rawValue: UInt((userInfo[UIKeyboardAnimationCurveUserInfoKey] as! NSNumber).intValue << 16))
UIView.animate(withDuration: duration, delay: 0, options:options, animations: animations, completion: nil)
}else{
animations()
}
}
func keyboardWillHidden(note: NSNotification) {
self.textView.transform = CGAffineTransform(translationX: 0 , y: 0)
}
在这里对代码进行简单的解释：
我们都知道，当焦点到可输入的控件上（一般指UITextField）时，键盘会自动显示，并且触发UIKeyboardWillShowNotification通知；当焦点离开可输入的控件时，键盘会自动隐藏，并且触发UIKeyboardWillHideNotification通知。所以，要注册这两种通知事件。
关于notification.userInfo的作用就是返回许多有用的参数，在这里我用的是UIKeyboardAnimationDurationUserInfoKey，查看内部我们可以发现 UIKeyboardAnimationDurationUserInfoKey = "0.25";
