setting target and action for a NSSlider programmatically in a class that is not file's owner - how?

[Rua Haszard Morris]

I'm trying to set the action for an NSSlider in a little helper class  
that is not the file's owner class associated with the window in the  
nib. At runtime, I get these console messages:


*** +[SliderHelper myAction:]: unrecognized selector sent to class  
0xeb74380
HIToolbox: ignoring exception '*** +[SliderHelper myAction:]:  
unrecognized selector sent to class 0xeb74380' that raised inside  
Carbon event dispatch


This is how I'm setting this up:
 - there's an NSObject subclass (call it MyDialog) containing  
IBOutlets for all the controls I care about.
 - there's another NSObject subclass (call it SliderHelper) which is  
intended to automate some behaviour common to a few controls in the  
dialog (and other dialogs in future)
 - MyDialog instantiates a SliderHelper and passes it an NSSlider*  
outlet referring to a slider
 - SliderHelper sets up the target and action for the slider  
programmatically in an +initWithSlider: method..


+(id) initTestSlider:(NSSlider*)aSlider {
SliderHelper* newOne = [[SliderHelper alloc] init];
[newOne setSlider:aSlider];
[[newOne slider] setTarget:self];
[[newOne slider] setAction:@selector(myAction:)];
return newOne;
}

 - myAction: is a void returning method with no params, and it is  
implemented!


How can I make this work?

Note that if I set the target and action from MyDialog (with a  
MyDialog -myAction of course) it works, what am I missing here?


thanks
Rua HM.
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Re: setting target and action for a NSSlider programmatically in a class that is not file's owner - how?

[Sherm Pendley]

On Thu, May 15, 2008 at 10:12 PM, Rua Haszard Morris 
[EMAIL PROTECTED] wrote:

 I'm trying to set the action for an NSSlider in a little helper class that
 is not the file's owner class associated with the window in the nib. At
 runtime, I get these console messages:

 *** +[SliderHelper myAction:]: unrecognized selector sent to class
 0xeb74380
 HIToolbox: ignoring exception '*** +[SliderHelper myAction:]: unrecognized
 selector sent to class 0xeb74380' that raised inside Carbon event dispatch

 This is how I'm setting this up:
  - there's an NSObject subclass (call it MyDialog) containing IBOutlets for
 all the controls I care about.
  - there's another NSObject subclass (call it SliderHelper) which is
 intended to automate some behaviour common to a few controls in the dialog
 (and other dialogs in future)
  - MyDialog instantiates a SliderHelper and passes it an NSSlider* outlet
 referring to a slider
  - SliderHelper sets up the target and action for the slider
 programmatically in an +initWithSlider: method..

 +(id) initTestSlider:(NSSlider*)aSlider {
SliderHelper* newOne = [[SliderHelper alloc] init];
[newOne setSlider:aSlider];
[[newOne slider] setTarget:self];


-init* is always an instance method, and always called as part of a [[Foo
alloc] initBlah] pair. Above, you're passing a Class object to setTarget,
but targets must be instances - hence the unrecognized selector error when
you try to send the action to the target.

I would write it like this:

-(id) initWithSlider:(NSSlider*)aSlider {
if ((self = [super init])) {
[aSlider setTarget:self];
[aSlider setAction:@selection(myAction:)];

[self setSlider:aSlider];
}
return self;
}

You should review the Cocoa Fundamentals Guide - especially the section
about object creation:


http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaFundamentals/CocoaObjects/chapter_3_section_6.html


sherm--

-- 
Cocoa programming in Perl: http://camelbones.sourceforge.net
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