Re: NSTextField and bindings
Re: NSTextField and bindings
- Subject: Re: NSTextField and bindings
- From: Fritz Anderson <email@hidden>
- Date: Tue, 4 May 2004 11:38:46 -0500
The Key-Value Validation documentation says, "Note: Key-value coding
does not perform validation automatically, it is your applications
responsibility to invoke the validation methods. Also, an
implementation of -set<Key>: for a property should never call the
validation methods."
This would seem to make KVV useless for your (or many) purposes, but
the value binding on the text field has a "Validate Immediately" switch
that does in fact automatically call KVV on the value.
-- 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.
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