Question

I am working on a class A which has a method -(void)DoSmthing1. I am making a call to
another method-(void)DoSmthing2 in class B. Now after doing some operations in class B, the method is supposed to call back a method-(void)DoSmthing3 previous class.

How will i call a method of current class from another class?? Can someone please help me….

Thanks in advance

edit1::
My Code:
Class A

{
-(void) MethodA {

}

-(void) MethodB {
   ClassB *clsB = [[ClassB alloc] init];
   [clsB MethodC];
}  
}  

Class B

{
  -(void)MethodC:(selector) {
  //here i want to call MethodA of classA, and i will prefer if it is possible by sending the name of the method as selector in this method(methodC)

    }  
}

edit2::

Another example i want to do smthing like follwoing:

ClassB *b = [[ClassB alloc] nitWithTarget:self selector:@selector(methodfromClassA) object:nil];

Here i want to call a method of class A once some task in Class B is completed, and that too from class A.

I hope it is much clear now.

Edit3:

- (void)loadView {
    AsyncConnection *async =[[AsyncConnection alloc] init];
    [async getAsync:self callback:@selector(test1)];
}

above code is from first class

-(void)getAsync:(id)anObject callback:(SEL)selector {
    NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:anObject 
                                                                            selector:@selector(selector) 
                                                                              object:nil];
    [queue addOperation:operation];
    [operation release];

}

and above code is from second class. Here i want to call a method of first class which is passed as selector.

Answer 1

- (void)loadView {
    AsyncConnection *async =[[AsyncConnection alloc] init];
    [async getAsync:self callback:@selector(test1)];
}

Other class:

-(void)getAsync:(id)anObject callback:(SEL)selector {
    NSInvocationOperation *operation = [[NSInvocationOperation alloc] 
         initWithTarget:anObject 
               selector:@selector(selector)
                 object:nil];

    [queue addOperation:operation];
    [operation release];

}

First, if you want to use the above pattern, remove the @selector() from @selector(selector). You already have the selector. Doing @selector(selector) will create the SEL named selector and not the selector passed in as the argument.

Next, this seems like an odd pattern to start with; it’ll work, but any experienced Obj-C/iOS/Cocoa developer will get the willies looking at it. Since you wrote the AsyncConnection class, use the delegate pattern. I.e. in the class that implements loadView.

That is, in AsyncConnection.h:

@property(retain) ClassA *callbackHandler;

And then:

- (void)loadView {
    AsyncConnection *async =[[AsyncConnection alloc] init];
    [async setCallbackHandler: self];
}

Then, in AsyncConnection, you would refer to the callback handler directly as self.callbackHandler (or [self callbackHandler]).