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Re: Setting action: with a variable
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Re: Setting action: with a variable


  • Subject: Re: Setting action: with a variable
  • From: Mike Fischer <email@hidden>
  • Date: Tue, 27 May 2008 19:42:44 +0200

Am 27.05.2008 um 18:19 schrieb Mark Manes <email@hidden>:

What I would like to do is set the action for NSButton
programmatically where the selector is a variable.

I can't seem to find an example.

[aButton addTarget:self action:variable ....]

NSButton does not respond to any message starting with addTarget:action:, so this must be your own method? If so what does its implementation look like and what do expect it to do?



If I define 'variable' to be NSString it is happy but at run time I
get an error stating that the target selector is Null. I can assure
you that variable exists and has a value of 'buttonAction:'.

As the error indicates it wants a "target selector". Selectors have the type SEL. They are not strings. You could try creating a selector from a string using NSSelectorFromString() or sel_registerName() or you could predefine the selectors you need using SEL a = @selector ("xyz:"), b = @selector("abc:"); and so on. But I'm not sure what you really want to achieve and whether one of these options would be a good solution to your problem.



I of course have buttonAction defined as follows:

- (void) buttonActon:(id)sender


What am I doing wrong?

You don't seem to understand what selectors are. Maybe (re)read <http://developer.apple.com/documentation/Cocoa/Conceptual/ObjectiveC/ Articles/chapter_8_section_3.html> ?



HTH Mike -- Mike Fischer Softwareentwicklung, EDV-Beratung Schulung, Vertrieb Note: I read this list in digest mode! Send me a private copy for faster responses.

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