Swift - Add dot in Number Pad Keyboard

Question

How to add dot in Number Pad Keyboard? I want when I use notification UIKeyboardDidShowNotification a UIButton to appear over down left side of the Number Pad keyboard.

This will be the frame of the button: let dotButton = UIButton(frame: CGRectMake(0, 162, view.frame.width/3, 54)) , but it has to be added as subview of the number pad keyboard to prevent hiding from it, how will be done ?

Edit: I made it to appear like this

    dotButton.addTarget(self, action: "addDot:", forControlEvents: .TouchUpInside)
    dotButton.setTitle(".", forState: .Normal)
    dotButton.titleLabel?.font = UIFont(name: "Helvetica Neue", size: 25)
    dotButton.setTitleColor(UIColor.blackColor(), forState: .Normal)
    dispatch_async(dispatch_get_main_queue(), {
        let keyboardView:UIView = UIApplication.sharedApplication().windows.last?.subviews.first as! UIView
        self.dotButton.frame = CGRectMake(0, keyboardView.frame.size.height-54, self.view.frame.width/3, 54)
        keyboardView.addSubview(self.dotButton)
        keyboardView.bringSubviewToFront(self.dotButton)
    })

but now I don't know how when I click to the button to add . in the textField with method addDot I don't know how to tell to the textField to add a . need help again...

Edit2: I made a class variable which is textFieldInEdit:UITextField! and in func textFieldShouldBeginEditing(textField: UITextField) -> Bool I do this textFieldInEdit = textField and now my function addDot is:

textFieldWhichEdit.text = "\(textFieldWhichEdit.text)." ,

but I've got another problem now.. I have fields with different keyboard types how to detect which keyboard appears and show the dot on the Number Pad only ?

Edit3:

func textFieldDidBeginEditing(textField: UITextField) {
    if(textField.keyboardType.rawValue==4){
        textFieldWhichEdit = textField
        dotButton.hidden = false
    }else{
        dotButton.hidden = true
    }
}

Done I've made a dot button on Number Pad keyboard :) If someone know better method can write it and I will accept the answer :)

Answer 1

yourTextField.keyboardType = .decimalPad