Initiates a series of delegate messages (and general notifications) to determine whether modifications can be made to the characters and attributes of the receiver’s text.
- macOS 10.4+
An array of ranges to change.
An array of strings containing the characters that replace those in
affected, one for each range. If only text attributes are being changed,
true to allow the change,
false to prohibit it.
This method checks with the delegate as needed using
This method must be invoked at the start of any sequence of user-initiated editing changes. If your subclass of
that modify the text, make sure to invoke this method to determine whether the change should be made. If the change is allowed, complete the change by invoking the
did method. If you can’t determine the affected range or replacement string before beginning changes, pass
nil for these values.
If you override this method, you must call
super at the beginning of the override.
If the receiver is not editable, this method automatically returns
false. This result prevents instances in which a text view could be changed by user actions even though it had been set to be non-editable.