textField(_:shouldChangeCharactersInRanges:replacementString:)

Declaration

optional func textField(_ textField: UITextField, shouldChangeCharactersInRanges ranges: [NSValue], replacementString string: String) -> Bool

Parameters

• textField:

  The text field asking the delegate

• ranges:

  The ranges of the text that should be deleted before replacing

Return Value

Returns YES if the text at the ranges should be replaced.

Discussion

Asks the delegate if the text at the specified ranges should be replaced with string.

If this method returns YES then the text field will, at its own discretion, choose any one of the specified ranges of text and replace it with the specified replacementString before deleting the text at the other ranges.