Create my own completion blocks in iOS

Question

I have an object which takes a long time to do some stuff (it downloads data from a server).

How can I write my own completion block so that I can run...

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Answer 1

You can copy the block then invoke it:

typedef void (^CallbackBlk)();

@property (copy) CallbackBlk cb;

- (void)doSomething:(CallbackBlk)blk
{
    self.cb = blk;

    // etc.
}

// when finished:
self.cb();