Swift 키보드 숨기기

도입 코드 세그먼트

import UIKit

private var kUIViewFrame = "kk_UIViewFrame"
extension UIViewController {
    
    func setUpKeyboardAutoHidden() {
        let notficaCenter = NSNotificationCenter.defaultCenter()
        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(UIViewController.touchedHiddenKeyBoard))
        
        objc_setAssociatedObject(self, &kUIViewFrame, NSValue(CGRect: self.view.frame), .OBJC_ASSOCIATION_RETAIN)
        
        //   tap  ,    
        notficaCenter.addObserverForName(
            UIKeyboardWillShowNotification,
            object: nil,
            queue: NSOperationQueue.mainQueue()) { (notification) -> Void in
                self.view.addGestureRecognizer(tapGesture)
        }
        
        //   Tap  ,   App  UIResponder   
        notficaCenter.addObserverForName(
            UIKeyboardWillHideNotification,
            object: nil,
            queue: NSOperationQueue.mainQueue()){ (notification) -> Void in
                self.view.removeGestureRecognizer(tapGesture)
        }
        
        //       
        notficaCenter.addObserverForName(
            UIKeyboardWillChangeFrameNotification,
            object: nil,
            queue: NSOperationQueue.mainQueue()) { (notification) -> Void in
                let usrInfo = notification.userInfo!
                let keyboardRect = usrInfo[UIKeyboardFrameEndUserInfoKey]!.CGRectValue
                if let respView = self.view.findFirstResponder {
                    
                    let convertRect = self.view.convertRect(respView.frame, fromView: respView.superview)
                    let offset = convertRect.origin.y + convertRect.height - keyboardRect.origin.y
                    var orignRect = objc_getAssociatedObject(self, &kUIViewFrame).CGRectValue
                    
                    if offset > 0 {
                        orignRect.origin.y = -offset
                    }
                    
                    UIView.animateWithDuration(0.3, animations: { () -> Void in
                        self.view.frame = orignRect
                    })
                }
        }
    }
    
    //        
    func touchedHiddenKeyBoard() {
        self.view.endEditing(true)
    }
}

사용

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        //       
        setUpKeyboardAutoHidden()
    }
}