ios - Why is textInput.keyboardType nil in textDidChange? -

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The

I'm developing a custom keyboard Swift and I would like to know when the keyboard type of change (a number or decimal For example keyboard type) I believe this should be done in either textDidChange or textWillChange . This method gets a UITextInput , which has a property keyboardType . But when this method is called, that property is always happening zero because it runs the following code, even after I have entered a different input type (number). 

  override function textDidChange (TextInput: UITextInput) {if the inputType = textInput.keyboardType {// here is never deleteKeyboardButton.backgroundColor = UIColor.yellowColor ()}}   itemprop = "text"> 
 its  keyboardType  property, no  text   
 
  should be obtained and the property of Use> TextInput .  
  var proxy as = self.textDocumentProxy UITextDocumentProxy if proxy.keyboardType == UIKeyboardType.EmailAddress {// email add code here to display Input}

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