SWift 的多线程延时

func delay(delay:Double, closure:()->()) {
        
        dispatch_after(
            dispatch_time( DISPATCH_TIME_NOW, Int64(delay * Double(NSEC_PER_SEC))), dispatch_get_main_queue(), closure)
        
        
    }

//_____________________
delay(5) {  
//写你的代码 
}