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.
}];