Keyboard not being dismissed before alertview

Question

I have a form, there are two fields, one is a text input, the other triggers a date picker to appear.

When editing the text field, the keyboard is on screen, when I press to display the date picker in the field below the keyboard remains on screen despite my attempts to suppress it.

TL;DR

 self.view.endEditing(true)

Isn't dismissing the keyboard

@IBAction func actDroppedOff(_ sender: Any) {
    dismissKeyboard()

    self.view.endEditing(true)

    DatePickerDialog().show("Select Picked Up Date", doneButtonTitle: "Finished", cancelButtonTitle: "Cancel", datePickerMode: .date) {
        (date) -> Void in
        if let dt = date {
            let formatter = DateFormatter()
            formatter.dateFormat = "MM'-'dd'-'yyyy"
            self.txtDroppedOff.text = formatter.string(from: dt)

        }

    }
}

Answer 1

您可以调用textfield.resignFirstResponder（）将键盘关闭

Answer 2

self.view.endEditing(true) should dismiss the keyboard for you. I'm not sure why you are calling dismissKeyboard() before that? What's in that function?