Re: key value observing stops
Re: key value observing stops
- Subject: Re: key value observing stops
- From: Allan Odgaard <email@hidden>
- Date: Tue, 24 Feb 2004 17:19:33 +0100
On 24. Feb 2004, at 16:50, Francisco Tolmasky wrote:
Please configure Mail to send letters as plain text -- I prefer to read
code in monospaced font after own choosing, which I do not get when you
send letters in rich text! :)
The array controller holds instances of my modelClass. I have a
custom NSCell being used by my table view subclass and all I want to
happen is that whenever the text field changes the model, for the cell
to update to show changes. [...]
The problem may be that you invoke setNeedsDisplay: on the table view.
This will redraw the table view, but it may not fetch new values from
the data source, and so nothing will change -- I assume you wanted to
send reloadData!?!
I am not sure I understand your design though, if I do then I would
suggest something on the line of:
In the text view subclass you only invoke
will/didChangeValueForKey:@"contents" and then you add a method (named
contents) to return the text that you would otherwise pass to the
model.
In your controller setup code you then do something like:
[textView bind:@"contents"
toObject:controller
withKeyPath:@"changedText"
options:nil];
That way, each time the text changes, the system will send
setChangedText: to your controller, with the text as argument.
So you implement that method to a) pass on the text to the model and b)
invoke reloadData on the table view.
The model should not need to send any will/didChangeValueForKey:
messages.
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