Re: Update slider position

FROM : Kyle Sluder
DATE : Sun May 11 20:35:02 2008

On Sun, May 11, 2008 at 12:50 PM, Mike <mike.<email_removed>> wrote:
>  I have NSTextField which is connected to a slider in IB with its (Sent
> Actions = Take Double Value from).


Don't do this.  See below.

>  (Apparently I can't have them both connected to each other AND still have
> connection to my controller when either is changed?)


Nope.  It doesn't make sense to have multiple things connected to one
outlet; that's why you have a controller.  That said, it does make
sense for something to be connected to multiple outlets.

>  Q: How do I make that reset to reflect to slider too without having another
> outlet and do it manually?


First you should review some introductory material on
model-view-controller.  In your setup, this is what you would do:

1. Create a controller object that has an IBAction method.  Something
like - (void)takeMyValue:(id)sender.
2. Add two outlets to your controller: an NSSlider* and an NSTextField*.
3. Wire up the target/action of both your slider and text field to
your controller object's -takeMyValue: method.
4. Wire up the NSSlider and NSTextField outlets of your controller
object to their respective views.
5. In -takeMyValue:, send both your slider and text field a
-setFloatValue: message with [sender floatValue] as the argument.

Here's an example of this pattern so you can see how it plays out:
http://cocoadevcentral.com/articles/000045.php

Or, instead of writing all this glue code, you can use bindings.  Make
a KVC-compliant property in your model and bind both the slider and
text field to that keypath.  No code required.

--Kyle Sluder