Material TextField previous next button - ios

Question

I am trying to get the previous/next arrow button on top of the keyboard when ever a textField is selected.
I have tried the following
textField0.tag = 0 // textField0 : TextField
textField0.addPreviousNextRightOnKeyboardWithTarget(self, rightButtonTitle: "Submit", previousAction: #selector(previousTextField(sender:)), nextAction: #selector(nextTextField(sender:)), rightButtonAction: #selector(saveNewPlan), titleText: nil)
textField1.tag = 1
textField1.addPreviousNextRightOnKeyboardWithTarget(self, rightButtonTitle: "Submit", previousAction: #selector(previousTextField(sender:)), nextAction: #selector(nextTextField(sender:)), rightButtonAction: #selector(saveNewPlan), titleText: nil)
The previous/next action selector defined as such.
func previousTextField(sender: AnyObject){
// I actually get the sender as IQBarButtonItem (subclass of UIBarButtonItem) instead of UITextField here
if let previousField = textField.superview?.viewWithTag(textField.tag - 1) as? UITextField {
_ = previousField.becomeFirstResponder()
}
}
func nextTextField(sender: AnyObject){
if let nextField = textField.superview?.viewWithTag(textField.tag + 1) as? UITextField {
_ = nextField.becomeFirstResponder()
}
}
It's throwing this error whenever I click on the button.
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[IQKeyboardManagerSwift.IQBarButtonItem superview]: unrecognized selector sent to instance 0x7fc3775658e0'
Here's what the method do.
public func addPreviousNextRightOnKeyboardWithTarget( _ target : AnyObject?, rightButtonTitle : String, previousAction : Selector, nextAction : Selector, rightButtonAction : Selector, titleText : String?) {
//If can't set InputAccessoryView. Then return
if self.responds(to: #selector(setter: UITextField.inputAccessoryView)) {
// Creating a toolBar for phoneNumber keyboard
let toolbar = IQToolbar()
toolbar.doneTitle = rightButtonTitle
var items : [UIBarButtonItem] = []
let prev : IQBarButtonItem
let next : IQBarButtonItem
// Get the top level "bundle" which may actually be the framework
var bundle = Bundle(for: IQKeyboardManager.self)
if let resourcePath = bundle.path(forResource: "IQKeyboardManager", ofType: "bundle") {
if let resourcesBundle = Bundle(path: resourcePath) {
bundle = resourcesBundle
}
}
var imageLeftArrow : UIImage!
var imageRightArrow : UIImage!
if #available(iOS 10.0, *) {
imageLeftArrow = UIImage(named: "IQButtonBarArrowUp", in: bundle, compatibleWith: nil)
imageRightArrow = UIImage(named: "IQButtonBarArrowDown", in: bundle, compatibleWith: nil)
} else {
imageLeftArrow = UIImage(named: "IQButtonBarArrowLeft", in: bundle, compatibleWith: nil)
imageRightArrow = UIImage(named: "IQButtonBarArrowRight", in: bundle, compatibleWith: nil)
}
//Support for RTL languages like Arabic, Persia etc... (Bug ID: #448)
if #available(iOS 9.0, *) {
imageLeftArrow = imageLeftArrow?.imageFlippedForRightToLeftLayoutDirection()
imageRightArrow = imageRightArrow?.imageFlippedForRightToLeftLayoutDirection()
}
prev = IQBarButtonItem(image: imageLeftArrow, style: UIBarButtonItemStyle.plain, target: target, action: previousAction)
prev.accessibilityLabel = "Toolbar Previous Button"
next = IQBarButtonItem(image: imageRightArrow, style: UIBarButtonItemStyle.plain, target: target, action: nextAction)
next.accessibilityLabel = "Toolbar Next Button"
//Previous button
items.append(prev)
//Fixed space
let fixed = IQBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.fixedSpace, target: nil, action: nil)
if #available(iOS 10.0, *) {
fixed.width = 6
} else {
fixed.width = 20
}
items.append(fixed)
//Next button
items.append(next)
//Flexible space
items.append(UIView.flexibleBarButtonItem())
//Title button
let title = IQTitleBarButtonItem(title: shouldHidePlaceholderText == true ? nil : titleText)
items.append(title)
//Flexible space
items.append(UIView.flexibleBarButtonItem())
//Right button
let doneButton = IQBarButtonItem(title: rightButtonTitle, style: UIBarButtonItemStyle.done, target: target, action: rightButtonAction)
items.append(doneButton)
// Adding button to toolBar.
toolbar.items = items
toolbar.toolbarTitleInvocation = self.titleInvocation
// Setting toolbar to keyboard.
if let textField = self as? UITextField {
textField.inputAccessoryView = toolbar
switch textField.keyboardAppearance {
case UIKeyboardAppearance.dark:
toolbar.barStyle = UIBarStyle.black
default:
toolbar.barStyle = UIBarStyle.default
}
} else if let textView = self as? UITextView {
textView.inputAccessoryView = toolbar
switch textView.keyboardAppearance {
case UIKeyboardAppearance.dark:
toolbar.barStyle = UIBarStyle.black
default:
toolbar.barStyle = UIBarStyle.default
}
}
}
}