Re: [Pyobjc-dev] Categories (was: Subclassing NSTextField)

[<bb...@ma...>]

On Wednesday, Dec 18, 2002, at 10:44 US/Eastern, Peter Montagner wrote:
> I don't know if this is what you want but it may help:
>
> http://www.cocoadev.com/index.pl?MethodSwizzling

Personally, I'm intimately familiar with method swizzling-- having used 
it many times to wreak havoc upon an application. :-)

His example isn't very good -- he could have used Posing to achieve the 
same thing.

The code is fairly clean, but has some issues. There is no need to 
swizzle the types-- the types should not change without serious risk of 
crashing.

There is no need to actually declare a method.  His alt method could 
easily have been declared as a C function:

void alt_method(T *self, SEL _cmd) {
     ...
}

This allows one to define the method without knowing the class 
declaration in the first place-- which is where swizzling is most 
useful (i.e. editing classes for which you do not have a declaration 
that can be used to compile against).

b.bum