KeyboardProtocol

KeyboardProtocol.swift

//
//  KeyboardProtocol.swift
//
//  Created by Mac on 21/06/17.
//  Copyright © 2017 Leo Valentim. All rights reserved.
//
import Foundation
import UIKit

@objc public protocol KeyboardProtocol : NSObjectProtocol {
    
    @objc optional func hideKeyboardWhenTappedAround()
    
    @objc optional func registerKeyboardInView()
    
    func keyboardWillShow(_ notification: Notification)
    
    func keyboardWillHide(_ notification: Notification)
}

extension KeyboardProtocol {
    func hideKeyboardWhenTappedAround(view: UIView, action: Selector) {
        //Looks for single or multiple taps.
        let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: action)
        view.addGestureRecognizer(tap)
    }
    
    func registerKeyboardInView(_ viewController: UIViewController) {
        NotificationCenter.default.addObserver(viewController, selector: #selector(keyboardWillShow(_:)), name:NSNotification.Name.UIKeyboardWillShow, object: nil)
        NotificationCenter.default.addObserver(viewController, selector: #selector(keyboardWillHide(_:)), name:NSNotification.Name.UIKeyboardWillHide, object: nil)
    }
}

/*
    var keyboardSize : CGRect! = nil
    var keyboardOpen : Bool = false

    override func viewDidLoad() {
        super.viewDidLoad()
        // ======= KeyboardProtocol ======= //
        self.hideKeyboardWhenTappedAround(view: self.view, action: #selector(self.dismissKeyboard))
        self.registerKeyboardInView(self)
    }
 
     func dismissKeyboard() {
         self.view.endEditing(true)
     }

    // ======= KeyboardProtocol ======= //
    func keyboardWillShow(_ notification: Notification) {
        if (self.keyboardSize) == nil {
            self.keyboardSize = ((notification as NSNotification).userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
            
            if self.keyboardSize.height == 0 {
                self.keyboardSize.size.height = 250.0
            }
        }
        
        if !keyboardOpen {
            self.scrollView.contentSize.height = self.scrollView.contentSize.height + self.keyboardSize.height
        }
        self.keyboardOpen = true
    }

    func keyboardWillHide(_ notification: Notification) {
        if (self.keyboardSize) == nil {
            self.keyboardSize = ((notification as NSNotification).userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
            
            if self.keyboardSize.height == 0 {
                self.keyboardSize.size.height = 250.0
            }
        }
        
        if keyboardOpen {
            self.scrollView.contentSize.height = self.scrollView.contentSize.height - self.keyboardSize.height
        }
        self.keyboardOpen = false
    }
    // ======= KeyboardProtocol ======= //
*/