How to pass object in NSInvocationOpreation

Question

I have created an NSInvocationOpertion object as follows

NSString *myString = @"Jai Hanuman";
NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(taskMethod) object:myString];
NSOperationQueue *operatioQueue = [[NSOperationQueue alloc] init];
    [operatioQueue addOperation:operation];

and can anybody tell me how can I access the myString object in taskMethod? Is it possible?

- (void)taskMethod{
    NSLog(@"Oh! Invocation's working buck");
}

Answer 1

You can try this:

Change your method to:

- (void)taskMethod:(NSString *) message{
NSLog(@"Oh! Invocation's working buck");
        message=//your string object;
  }

and

NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(taskMethod:) object:myString];

Answer 2

Define the method with one parameter:

- (void)taskMethod: (NSString *)theString {
    NSLog(@"Called with string: %@", theString);
}

and create the operation as:

NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self 
         selector:@selector(taskMethod:) object:myString];

Note the additional colon in the selector, it indicates that the method takes one argument.