Objective C - 2 .m files for one .h file?

Question

My question is, that I would know how to use 2 .m files for one objectclass also for one header (.h)

I have a big method with 20000+ lines and I would, that this method

Answer 1

You can make the excessively long method a category of the class:

MyClass.h:

@interface MyClass
@property ...
-(void) method;
...
@end

@interface MyClass (BigMethod)
-(void) bigMethod;
@end

MyClass.m:

@implementation MyClass
-(void) method
{
    ...
}
...
@end

BigMethod.m

@implementation MyClass (BigMethod)
-(void) bigMethod
{
    ...
}
@end

However, a 20k line method is absurd. You should really refactor it.