Creating an NSInvocationOperation Object / NSBlockOperation Object

@implementation MyCustomClass
  - (NSOperation*)taskWithData:(id)data {
NSInvocationOperation* theOp = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(myTaskMethod:) object:data];

     return theOp;
  }
  // This is the method that does the actual work of the task.
  - (void)myTaskMethod:(id)data {
      // Perform the task.
  }
@end

NSBlockOperation* theOp = [NSBlockOperation blockOperationWithBlock: ^{
      NSLog(@"Beginning operation.\n");
      // Do some work.
}];