swift 键盘属性与事件

1、键盘的类型

        textField1.keyboardType = UIKeyboardType.default  //系统默认的虚拟键盘
        textField1.keyboardType = UIKeyboardType.asciiCapable  //显示英文字母的虚拟键盘
        textField1.keyboardType = UIKeyboardType.numbersAndPunctuation  //显示数字和标点的虚拟键盘
        textField1.keyboardType = UIKeyboardType.URL  //显示便于输入数字的虚拟键盘
        textField1.keyboardType = UIKeyboardType.numberPad  //显示便于输入数字的虚拟键盘
        textField1.keyboardType = UIKeyboardType.phonePad  //显示便于拨号呼叫的虚拟键盘
        textField1.keyboardType = UIKeyboardType.namePhonePad  //显示便于聊天拨号的虚拟键盘
        textField1.keyboardType = UIKeyboardType.emailAddress  //显示便于输入Email的虚拟键盘
        textField1.keyboardType = UIKeyboardType.decimalPad  //显示用于输入数字和小数点的虚拟键盘
        textField1.keyboardType = UIKeyboardType.twitter  //显示方便些Twitter的虚拟键盘
        textField1.keyboardType = UIKeyboardType.webSearch  //显示便于在网页上书写的虚拟键盘
        textField1.keyboardType = UIKeyboardType.asciiCapableNumberPad  //显示便于输入数字的虚拟键盘 只支持iOS10
        textField1.keyboardType = UIKeyboardType.alphabet //字母键盘  已弃用

2、键盘的外观

       textField1.keyboardAppearance = .default //默认外观：浅灰色
       textField1.keyboardAppearance = .dark //黑色
       textField1.keyboardAppearance = .light //亮色，与Default很相似

3、键盘的回车键

        textField1.returnKeyType = .default //默认：灰色按钮，标有Return
        textField1.returnKeyType = .continue  // 标有Continue的蓝色按钮
        textField1.returnKeyType = .done //标有Done的蓝色按钮
        textField1.returnKeyType = .emergencyCall //紧急呼叫按钮
        textField1.returnKeyType = .go  //标有Go的蓝色按钮
        textField1.returnKeyType = .google  //标有Google的蓝色按钮，用于搜索
        textField1.returnKeyType = .join //标有Join的蓝色按钮
        textField1.returnKeyType = .next //标有Next的蓝色按钮
        textField1.returnKeyType = .route //标有Route的蓝色按钮
        textField1.returnKeyType = .search //标有Search的蓝色按钮
        textField1.returnKeyType = .send //标有Send的蓝色按钮
        textField1.returnKeyType = .yahoo //标有Yahoo!的蓝色按钮，用于搜索

4、键盘的回车键

        textField1.autocorrectionType = .default  //默认
        textField1.autocorrectionType = .no  //不自动更正
        textField1.autocorrectionType = .yes  //自动更正

5、键盘的安全性

        textField1.isSecureTextEntry = true //输入密码

6、回收键盘

     //按return回收键盘
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true
    }

    //点击空白回收键盘
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        self.view.endEditing(true)
    }

7、键盘的事件 监听键盘的弹出和消失，避免遮挡输入框

只能说这里坑太多了，是真的太多了，和2.0差别太大，不说了坑太多了，上代码

    //Mark:Delegate
    func textFieldDidBeginEditing(_ textField: UITextField) {
        //监听键盘弹出通知
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(notification:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
        //监听键盘收回通知
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(notification:)), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
    }
    func textFieldDidEndEditing(_ textField: UITextField) {
        self.view.endEditing(true)

    }

    //键盘显示
    func keyboardWillShow(notification:NSNotification) {

        let textMaxY = self.textField1!.frame.maxY // 取到输入框的最大的y坐标值

        let userinfo: NSDictionary = notification.userInfo! as NSDictionary

        let nsValue:AnyObject? = userinfo.object(forKey: UIKeyboardFrameEndUserInfoKey) as AnyObject?

        let keyboardY = nsValue?.cgRectValue.origin.y  //取到键盘的y坐标

//        设置动画

        let duration = 2.0

        UIView.animate(withDuration: duration) { () -> Void in
            if (textMaxY > keyboardY!) {
                self.view.transform = CGAffineTransform(translationX: 0, y: keyboardY! - textMaxY - 10)
            }else{
                //view.transform = CGAffineTransformIdentity;线性代数里面讲的矩阵变换，这个是恒等变换当 你改变过一个view.transform属性或者view.layer.transform的时候需要恢复默认状态的话，记得先把他们重置可以使用view.transform = CGAffineTransformIdentity，或者view.layer.transform = CATransform3DIdentity，
                self.view.transform = CGAffineTransform.identity
            }
        }
    }
     //键盘隐藏
    func keyboardWillHide(notification:NSNotification){

        UIView.animate(withDuration: 2.0) { () -> Void in
            self.view.transform = CGAffineTransform.identity
        }

    }

这里只是简单的写法，在正式的项目中，请各位判断是否需要进行动画操作，当然这并不会影响最终的效果，但是对性能会造成一定的影响

下面贴出他到底有多坑：你搜索出来的获取键盘弹出的高度的结果一定是这样的：

let userinfo: NSDictionary = aNotification.userInfo!

let nsValue = userinfo.objectForKey(UIKeyboardFrameEndUserInfoKey)

let keyboardRec = nsValue?.CGRectValue()

let height = keyboardRec?.size.height

文／其所以然（简书作者）
原文链接：http://www.jianshu.com/p/49edd72e07a5
著作权归作者所有，转载请联系作者获得授权，并标注“简书作者”。

这是2.0的写法，转换成3.0是这样的

 let textMaxY = self.textField1!.frame.maxY

 let userinfo: NSDictionary = notification.userInfo! as NSDictionary

 let nsValue = userinfo.object(forKey: UIKeyboardFrameEndUserInfoKey)

 let keyboardRec = (nsValue as AnyObject).cgRectValue

 let height = keyboardRec?.size.height

然后你会发现 height一直是nil 对啊 一直是nil啊  ，你怎么操作啊，傻逼了吧。原因到底是什么呢？    。。。。。不知道

或者你搜索出来的结果是这样的 ：

  let keyboardH : CGFloat? = (((notification.userInfo![UIKeyboardFrameEndUserInfoKey] as AnyObject).cgRectValue?.size.height))

其实是第一种结果的简写，这样依旧获取不到键盘的高度。

具体这两种写法的区别在哪里导致获取不到键盘的高度的，知道的小伙伴还请分享一下，在下也是3.0的菜鸟