Skeyboard.swift

struct SKeyBoard {
    
    // 注册键盘出现
    static func registerKeyBoardShow(target: UIViewController) {
        NSNotificationCenter.defaultCenter().addObserver(target, selector: "keyboardWillShowNotification:", name: UIKeyboardWillShowNotification, object: nil)
    }
    
    // 注册键盘隐藏
   static func registerKeyBoardHide(target: UIViewController) {
        NSNotificationCenter.defaultCenter().addObserver(target, selector: "keyboardWillHideNotification:", name: UIKeyboardWillHideNotification, object: nil)
    }
    
    // 移除键盘出现通知
    static func removeKeyboardNotifications(target: UIViewController) {
        NSNotificationCenter.defaultCenter().removeObserver(target, name: UIKeyboardWillShowNotification, object: nil)
    }
    
    // 移除键盘隐藏通知
    static func removeKeyboardHideNotifications(target: UIViewController) {
        NSNotificationCenter.defaultCenter().removeObserver(target, name: UIKeyboardWillHideNotification, object: nil)
    }
    
    // 返回键盘高度
   static func getKeyboardHeight(notification: NSNotification) -> CGFloat {
        let userInfo = notification.userInfo
        let keyboardSize = userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue
        
        return keyboardSize.CGRectValue().height
    }
    
    // 返回键盘上拉动画持续时间
   static func getKeyBoardDuration(notification: NSNotification) -> Double {
        let userInfo = notification.userInfo
        let keyboardDuration = userInfo![UIKeyboardAnimationDurationUserInfoKey] as! Double
        
        return keyboardDuration
    }
    
    // 返回键盘动画曲线
   static func getKeyBoardAnimationCurve(notification: NSNotification) -> NSObject {
        let userInfo = notification.userInfo
        let keyboardTranstionAnimationCurve = userInfo![UIKeyboardAnimationDurationUserInfoKey] as! NSValue
    
        return keyboardTranstionAnimationCurve
    }
    
    
}

使用

1.注册通知

    SKeyBoard.registerKeyBoardShow(self)
    SKeyBoard.registerKeyBoardHide(self)

2.必须实现以下2个方法，否则程序会崩溃

func keyboardWillShowNotification(notification:NSNotification){
    let rect = SKeyBoard.getKeyboardHeight(notification)
    self.textView.contentInset = UIEdgeInsetsMake(0, 0, rect, 0)
    
}

func keyboardWillHideNotification(notification: NSNotification) {
    self.textView.contentInset = UIEdgeInsetsMake(0, 0, 0, 0)
}