is there a way to add blocks to NSOperationQueue like this

Question

I am trying to understand NSOperationQueue's and am trying to create the most simple example possible. I have the following:

NSOperationQueue *myOQ=[[NSOperationQueue alloc] init];

[myOQ addOperationWithBlock:^(void){
  NSLog(@"here is something for jt 2");
}];
[myOQ addOperationWithBlock:^(void){
  NSLog(@"oh is this going to work 2");
}];

But would like to do this:

void  (^jt)() = ^void(){
  NSLog(@"here is something for jt");
};

void (^cl)() = ^void(){
  NSLog(@"oh is this going to work");
};

NSOperationQueue *myOQ=[[NSOperationQueue alloc] init];

[myOQ addOperation:jt];
[myOQ addOperation:cl];

Is this latter form possible? Can I convert a block to an NSOperation?

thx in advance

No that won't work, but why do you even want to do that? What are you trying to achieve? — Paul.s, Jan 11 '13 at 16:41
just learning with simple example: this was also helpful but read the comments too http://eng.pulse.me/concurrent-downloads-using-nsoperationqueues/ — timpone, Jan 11 '13 at 17:07

score 29 · Accepted Answer · edited May 10 '14 at 15:45

You could:

NSBlockOperation *jtOperation = [NSBlockOperation blockOperationWithBlock:^{
    NSLog(@"here is something for jt");
}];

NSBlockOperation *clOperation = [NSBlockOperation blockOperationWithBlock:^{
    NSLog(@"oh is this going to work");
}];

[myOQ addOperation:jtOperation];
[myOQ addOperation:clOperation];

Having said that, I'd generally do addOperationWithBlock unless I really needed the NSOperation object pointers for some other reason (e.g. to establish dependencies between operations, etc.).

score 2 · Answer 2 · answered Nov 05 '15 at 09:19

2

You can also do

[operationQueue addOperationWithBlock:^{
    // Stuff
})];

answered Nov 05 '15 at 09:19

txulu

1,602
16
26

score 0 · Answer 3 · answered Apr 03 '16 at 11:41

0

Swift

let networkingOperation = NSBlockOperation(block: {
                             // Your code here
                          })

answered Apr 03 '16 at 11:41

Oded Regev

4,065
2
38
50

2

Your solution is tempting, but you should never use `NSBlockOperation` wrapping an _asynchronous_ function, like a network request. Rather, properly subclass `NSOperation`. `NSOperationQueue` is meant to execute asynchronous tasks aka `NSOperation` instances. The `NSBlockOperation` is simply a helper where you can enqueue a _synchronous_ operation. In that case, however, you would be almost always better off using dispatch queues. – CouchDeveloper Apr 19 '17 at 05:49

is there a way to add blocks to NSOperationQueue like this

3 Answers3