Re: NSTextField and bindings
Re: NSTextField and bindings
- Subject: Re: NSTextField and bindings
- From: Fritz Anderson <email@hidden>
- Date: Tue, 4 May 2004 11:10:01 -0500
Look in the documents by doing a full-text search for "Key-Value
Validation."
<
http://developer.apple.com/documentation/Cocoa/Conceptual/
KeyValueCoding/Concepts/Validation.html>
-- F
On 4 May 2004, at 10:45 AM, Steve Sims wrote:
I have an NSTextField in my app and I'm using bindings to hook it up
to my data model. Now it's important that this text field keeps a
value, and is not set to an empty string. With that in mind I wrote a
quick setter method as follows:
- (void)setText:(NSMutableString *)newText {
if ((text != newText) && ([newText length]>0)) {
[text release];
text = [newText copy];
}
}
Now whilst this ensures that within my data model the text field keeps
its value when an empty string is attempted to be entered in the UI
the UI does not reflect this: the text field on screen stays empty.
I tried adding in [self willChangeValueForKey:@"text"]; and [self
didChangeValueForKey:@"text"]; calls at the beginning and end of this
setter (outside the if) since I thought that may force the UI to
update, but it didn't work.
_______________________________________________
cocoa-dev mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/cocoa-dev
Do not post admin requests to the list. They will be ignored.