Adjust Scroll View Content Inset Based on Keyboard Frame

adjust-scrollview-content-inset-based-on-keyboard-frame-method.swift

// https://hashaam.com/2017/09/02/adjust-scroll-view-content-inset-based-on-keyboard-frame

func adjustForKeyboardHandler(notification: Notification) {
        
    // this method assumes scrollView is defined
        
    guard let userInfo = notification.userInfo else { return }
    guard let value = userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue else { return }
    
    let keyboardFrame = value.cgRectValue
    
    var contentInset: UIEdgeInsets!
    
    switch notification.name {
        
    case Notification.Name.UIKeyboardWillHide:
        contentInset = UIEdgeInsets(top: 64.0, left: 0.0, bottom: 0.0, right: 0.0)
        
    case Notification.Name.UIKeyboardWillChangeFrame:
        contentInset = UIEdgeInsets(top: 64.0, left: 0.0, bottom: keyboardFrame.size.height, right: 0.0)
        
    default:
        break
        
    }
    
    scrollView.contentInset = contentInset
    scrollView.scrollIndicatorInsets = contentInset
    
}