On Feb 22, 2008, at 9:55 AM, mmalc crawford wrote:
On Feb 22, 2008, at 1:34 AM, Adam P Jenkins wrote:
On Feb 22, 2008, at 12:03 AM, Chris Schmitt wrote:
I am sure this is easy and I am just missing something, but I want
to bind my integer attribute to an NSTextField. The data is
displayed correctly, but after I update the value in the text
field and try to save the changes back to my model. I get an
error saying that the update failed trying to set the integer
value to a string value.
I have been searching for a while and I think I need to use a
number formatter, but it would seem that there is an easier way to
do this.
On a side note, what is the best way to make sure only numbers are
typed into the text field?
Using a number formatter is the easiest way to accomplish both of
these tasks.
The fundamental problem is that trying to set the value in the test
field is wrong.
<http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaBindings/Concepts/Troubleshooting.html#//apple_ref/doc/uid/TP40002148-182467
>
You're assuming that by "update the value in the text field", the
original poster meant that they were doing it programmatically.
However the post doesn't say that, so I assumed they meant they
updated the value by typing into it, in which case using a
NumberFormatter is a good solution to both prevent the user from
entering non-numeric input, and to convert between text and the
correct bound-to property type.
You're correct in pointing out that updating the text field's value
programmatically is the wrong way to go about things. However that
causes a different problem than what the original poster was describing.
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