dispatch_after - GCD in Swift?

Question

I\'ve gone through the iBook from Apple, and couldn\'t find any definition of it:

Can someone explain the structure of dispatch_after?

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Answer 1

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(10 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
    // ...
});

The dispatch_after(_:_:_:) function takes three parameters:

a delay
a dispatch queue
a block or closure

The dispatch_after(_:_:_:) function invokes the block or closure on the dispatch queue that is passed to the function after a given delay. Note that the delay is created using the dispatch_time(_:_:) function. Remember this because we also use this function in Swift.

I recommend to go through the tutorial Raywenderlich Dispatch tutorial