Re: Using @selector()

2008-08-11 Thread Negm-Awad Amin 


Am Sa,09.08.2008 um 11:23 schrieb Christian Giordano:


yep, it works with that :)
I presume it is an error in the book. Personally I thought that
passing the method not as string it would have recognized the scope
(target) automatically.
Fortunaly they don't. Selector-dispatching is performed dynamically as  
every other message-dispatch. So the same selector can be executed on  
different objects of different classes. Otherwise some techniques of  
Cocoa wouldn't work (I. e. responder chain, bindings)


Amin



Thanks a lot, chr


On Sat, Aug 9, 2008 at 9:45 AM, Jean-Daniel Dupas
[EMAIL PROTECTED] wrote:


Le 9 août 08 à 10:34, Christian Giordano a écrit :


Hi guys, I'm a newbie and I'm reading a book which shows the two
different option to link programmatically a control to an action:

SEL mySelector;
mySelector = @selector(methodName:);
[myButton setAction:mySelector];

OR

SEL mySelector;
mySelector = NSSelectorFromString(@methodName:);
[myButton setTarget:someObjectWithTheMethod];
[myButton setAction:mySelector];

On my test, the first syntax doesn't seem to work. This is my
implementation.

- (void)awakeFromNib
{
  NSLog(@awakeFromNib);
 SEL mySelector;
  mySelector = @selector(sayIt:);
  [sayItButton setAction:mySelector];
}

If I do the other syntax:

- (void)awakeFromNib
{
  NSLog(@awakeFromNib);
 SEL mySelector;
  mySelector = NSSelectorFromString(@sayIt:);
  [sayItButton setTarget:self];
  [sayItButton setAction:mySelector];
}

Works. The sayIt method is in the same class than the awakeFromNib  
of

course. Any ideas?



Why you do not set the target in the first method ?




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Amin Negm-Awad
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Using @selector()

2008-08-09 Thread Christian Giordano 
Hi guys, I'm a newbie and I'm reading a book which shows the two
different option to link programmatically a control to an action:

SEL mySelector;
mySelector = @selector(methodName:);
[myButton setAction:mySelector];

OR

SEL mySelector;
mySelector = NSSelectorFromString(@methodName:);
[myButton setTarget:someObjectWithTheMethod];
[myButton setAction:mySelector];

On my test, the first syntax doesn't seem to work. This is my implementation.

- (void)awakeFromNib
{
NSLog(@awakeFromNib);
SEL mySelector;
mySelector = @selector(sayIt:); 
[sayItButton setAction:mySelector];
}

If I do the other syntax:

- (void)awakeFromNib
{
NSLog(@awakeFromNib);
SEL mySelector;
mySelector = NSSelectorFromString(@sayIt:);
[sayItButton setTarget:self];
[sayItButton setAction:mySelector];
}

Works. The sayIt method is in the same class than the awakeFromNib of
course. Any ideas?


Thanks, chr
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Re: Using @selector()

2008-08-09 Thread Jean-Daniel Dupas 


Le 9 août 08 à 10:34, Christian Giordano a écrit :


Hi guys, I'm a newbie and I'm reading a book which shows the two
different option to link programmatically a control to an action:

SEL mySelector;
mySelector = @selector(methodName:);
[myButton setAction:mySelector];

OR

SEL mySelector;
mySelector = NSSelectorFromString(@methodName:);
[myButton setTarget:someObjectWithTheMethod];
[myButton setAction:mySelector];

On my test, the first syntax doesn't seem to work. This is my  
implementation.


- (void)awakeFromNib
{
NSLog(@awakeFromNib);
   SEL mySelector;
mySelector = @selector(sayIt:); 
[sayItButton setAction:mySelector];
}

If I do the other syntax:

- (void)awakeFromNib
{
NSLog(@awakeFromNib);
   SEL mySelector;
mySelector = NSSelectorFromString(@sayIt:);
[sayItButton setTarget:self];
[sayItButton setAction:mySelector];
}

Works. The sayIt method is in the same class than the awakeFromNib of
course. Any ideas?



Why you do not set the target in the first method ?


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Re: Using @selector()

2008-08-09 Thread Christian Giordano 
yep, it works with that :)
I presume it is an error in the book. Personally I thought that
passing the method not as string it would have recognized the scope
(target) automatically.

Thanks a lot, chr


On Sat, Aug 9, 2008 at 9:45 AM, Jean-Daniel Dupas
[EMAIL PROTECTED] wrote:

 Le 9 août 08 à 10:34, Christian Giordano a écrit :

 Hi guys, I'm a newbie and I'm reading a book which shows the two
 different option to link programmatically a control to an action:

 SEL mySelector;
 mySelector = @selector(methodName:);
 [myButton setAction:mySelector];

 OR

 SEL mySelector;
 mySelector = NSSelectorFromString(@methodName:);
 [myButton setTarget:someObjectWithTheMethod];
 [myButton setAction:mySelector];

 On my test, the first syntax doesn't seem to work. This is my
 implementation.

 - (void)awakeFromNib
 {
NSLog(@awakeFromNib);
   SEL mySelector;
mySelector = @selector(sayIt:);
[sayItButton setAction:mySelector];
 }

 If I do the other syntax:

 - (void)awakeFromNib
 {
NSLog(@awakeFromNib);
   SEL mySelector;
mySelector = NSSelectorFromString(@sayIt:);
[sayItButton setTarget:self];
[sayItButton setAction:mySelector];
 }

 Works. The sayIt method is in the same class than the awakeFromNib of
 course. Any ideas?


 Why you do not set the target in the first method ?



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Re: Using @selector()

2008-08-09 Thread Uli Kusterer 

On 09.08.2008, at 11:23, Christian Giordano wrote:

yep, it works with that :) I presume it is an error in the book.


 Probably. Or they hooked up the target in IB before that.

Personally I thought that passing the method not as string it would  
have recognized the scope (target) automatically.



 Now you know better. FWIW, it helps me to think that @selector() is  
like referencing a function pointer directly, while  
NSSelectorFromString() is like using CFBundle or dyld of CFM's  
FindSymbol(), or whatever API you've used before to look up functions  
at runtime. If you've used one at runtime ... which I guess only  
compiler and plug-in nuts like me do, so forget what I said ... :-)


Cheers,
-- Uli Kusterer
The Witnesses of TeachText are everywhere...
http://www.zathras.de





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