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import UIKitclass ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() //方式1：使用类方法 NSThread.detachNewThreadSelector("downloadImage", toTarget: self, withObject: nil) //方式2：实例方法-便利构造器 var myThread:NSThread = NSThread(target: self, selector: "downloadImage", object: nil) myThread.start() } //定义一个下载图片的方法，线程调用 func downloadImage(){ var data = NSData(contentsOfURL: NSURL(string: imageUrl)!, options: nil, error: nil) println(data?.length) } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. }} |
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import UIKitclass ViewController: UIViewController { //定义两个线程 var thread1:NSThread? var thread2:NSThread? //定义两个线程条件，用于锁住线程 let condition1 = NSCondition() let condition2 = NSCondition() override func viewDidLoad() { super.viewDidLoad() thread2 = NSThread(target: self, selector: "method2:", object: nil) thread1 = NSThread(target: self, selector: "method1:", object: nil) thread1?.start() } //定义两方法，用于两个线程调用 func method1(sender:AnyObject){ for var i=0; i<10; i++ { print("NSThread 1 running \(i)") sleep(1) if i == 2 { thread2?.start() //启动线程2 //本线程（thread1）锁定 condition1.lock() condition1.wait() condition1.unlock() } } print("NSThread 1 over") //线程2激活 condition2.signal() } //方法2 func method2(sender:AnyObject){ for var i=0; i<10; i++ { print("NSThread 2 running \(i)") sleep(1) if i == 2 { //线程1激活 condition1.signal() //本线程（thread2）锁定 condition2.lock() condition2.wait() condition2.unlock() } } print("NSThread 2 over") } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. }} |
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NSThread 1 running 0NSThread 1 running 1NSThread 1 running 2NSThread 2 running 0NSThread 2 running 1NSThread 2 running 2NSThread 1 running 3NSThread 1 running 4NSThread 1 running 5NSThread 1 running 6NSThread 1 running 7NSThread 1 running 8NSThread 1 running 9NSThread 1 overNSThread 2 running 3NSThread 2 running 4NSThread 2 running 5NSThread 2 running 6NSThread 2 running 7NSThread 2 running 8NSThread 2 running 9NSThread 2 over |
原文：http://www.cnblogs.com/Free-Thinker/p/4841132.html
