func RunAfterDelay(delay: NSTimeInterval, block: dispatch_block_t) {
let time = dispatch_time(DISPATCH_TIME_NOW, Int64(delay * Double(NSEC_PER_SEC)))
dispatch_after(time, dispatch_get_main_queue(), block)
}
func RunAfterDelay(delay: NSTimeInterval, block
阅读背景：
Grand Central Dispatch寻找不同的方法
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