Run a block on the main thread after a specified number of seconds.

ThreadUtil.swift

import Foundation

public class ThreadUtil : NSObject {

    // Run a block on the main thread after a specified number of seconds, thanks raywenderlich.com for splaining it so well
    public static func runOnMainThreadAfterDelay(delaySeconds: Double, closure: () -> ()) {
        let startTime = dispatch_time(DISPATCH_TIME_NOW, Int64(delaySeconds * Double(NSEC_PER_SEC)))
        dispatch_after(startTime, dispatch_get_main_queue(), closure)
    }

}