RxSwift Helpers

UIViewController+Keyboard.swift

import UIKit
import RxCocoa
import RxSwift

// KEYBOARD STUFF
extension UIViewController {
  
  func setupViewResizerOnKeyboardShown(bag:DisposeBag) {
    
    NotificationCenter.default.rx
      .notification(Notification.Name.UIKeyboardWillShow)
      .bind { [weak self] (notification) in
        
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue,
          let v = self?.view,
          let window = v.window?.frame {
          v.frame = CGRect(x: v.frame.origin.x,
                           y: v.frame.origin.y,
                           width: v.frame.width,
                           height: window.origin.y + window.height - keyboardSize.height)
        }
        
      }.addDisposableTo(bag)
    
    NotificationCenter.default.rx
      .notification(Notification.Name.UIKeyboardWillHide)
      .bind { [weak self] (notification) in
        
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue,
          let v = self?.view {
          let viewHeight = v.frame.height
          v.frame = CGRect(x: v.frame.origin.x,
                           y: v.frame.origin.y,
                           width: v.frame.width,
                           height: viewHeight + keyboardSize.height)
        }
        
      }.addDisposableTo(bag)
    
  }
  
}