delay_block.swift

/**
 * Delay the block specified by delay seconds
 *
 * With help from http://stackoverflow.com/questions/24034544/dispatch-after-gcd-in-swift/24318861#24318861
 */
func delay(delay:Double, closure:()->()) {
    dispatch_after(
        dispatch_time(
            DISPATCH_TIME_NOW,
            Int64(delay * Double(NSEC_PER_SEC))
        ),
        dispatch_get_main_queue(), closure)
}




// Usage
delay(0.4) {
    // do stuff
}