Swift-->GCD,NSThread,NSBlockOperation多线程使用(主线程回调)

概述应用程序开发,少不了的多线程,与多线程相关的就是线程同步. 本文介绍Swift最简单的多线程使用. 推荐阅读: http://www.jianshu.com/p/0b0d9b1f1f19 看例子: 1:获取线程基本的信息 func getThreadInfo() { let thread = NSThread.currentThread() let threadInfo = "线程

应用程序开发,少不了的多线程,与多线程相关的就是线程同步.
本文介绍Swift最简单的多线程使用.

推荐阅读: http://www.jianshu.com/p/0b0d9b1f1f19

看例子:

1:获取线程基本的信息

func getThreadInfo() {    let thread = NSThread.currentThread()    let threadInfo = "线程名:\(thread.name)\n" +        "堆栈大小:\(thread.stackSize)\n" +        "优先级:\(thread.threadPriority)\n" +        "是否是主线程:\(thread.isMainThread)\n" +        "地址:\(NSThread.callStackReturnAddresses().first)-\(NSThread.callStackReturnAddresses().last!)"}

2:子线程的创建方法

// MARK: 手动创建线程,并且手动开始线程func createSingleThread() {    NSThread(target: self,selector: #selector(onThreadRun),object: nil).start()}// MARK: 创建线程并自动开始线程func createAndStartThread() {    NSThread.detachNewThreadSelector(#selector(onThreadRun),toTarget: self,withObject: nil)}

3:GCD(Grand Central dispatch)队列的使用

// MARK:添加一个block到主线程队列,注意会阻塞当前线程,等待当前队列任务执行完,才会执行blockfunc gcdMainQueueSync() {    dispatch_sync(dispatch_get_main_queue()) {        print("main_sync")        self.getThreadInfo()    }}// MARK: 添加一个block到主队列,异步执行,不会阻塞当前线程func gcdMainQueueAsync() {    dispatch_async(dispatch_get_main_queue()) {        print("main_async")        self.getThreadInfo()    }}

4:自定义queue

// MARK: 自定义一个同步队列func gcdCustomSerialQueue() {    let queue = dispatch_queue_create("serial_queue",disPATCH_QUEUE_SERIAL)    // 同步调用,当前线程执行// dispatch_sync(queue) {// print("custom_queue")// self.getThreadInfo()// }    // 异步调用,子线程执行    dispatch_async(queue) {        print("custom_queue")        self.getThreadInfo()    }}// MARK: 自定义一个异步队列func gcdCustomConcurrentQueue() {    let queue = dispatch_queue_create("serial_queue",disPATCH_QUEUE_CONCURRENT)// dispatch_sync(queue) {// print("custom_queue")// self.getThreadInfo()// }    dispatch_async(queue) {        print("custom_queue")        self.getThreadInfo()    }}

5:NSBlockOperation和NSOperationQueue的使用

// MARK: ns block 会在当前线程执行,并且是一个 并行队列func blockOperation() {    // 并行队列,多任务会同时进行// NSBlockOperation {// print("blockOperation")// self.getThreadInfo()// }.start()    let block = NSBlockOperation {        print("blockOperation1")        self.getThreadInfo()    }    block.addExecutionBlock {        print("blockOperation2")        self.getThreadInfo()    }    block.addExecutionBlock {        print("blockOperation3")        self.getThreadInfo()    }    block.start() // 并行执行1,2,3个任务,执行顺序不保证}// MARK: 添加到队列的block会立即执行,func blockOperationQueue() {    let queue = NSOperationQueue()// queue.addOperationWithBlock {// print("blockOperationQueue")// self.getThreadInfo()// }    let operation1 = NSBlockOperation {        print("operation1")        self.getThreadInfo()    }    let operation2 = NSBlockOperation {        print("operation2")        self.getThreadInfo()    }    let operation3 = NSBlockOperation {        print("operation3")        self.getThreadInfo()    }    operation2.addDependency(operation1) // 2会等待1执行完后,再执行    operation3.addDependency(operation2) // 3会等待2执行完后,再执行    queue.addOperations([operation1,operation2,operation3],waitUntilFinished: true) //}

6:子线程调用,主线程执行(必备技能,更新UI的首选)

// MARK: 一定在主线程回调func mainThread() {    // 1->在主线程的队列执行    dispatch_async(dispatch_get_main_queue()) {        print("dispatch_async")        self.getThreadInfo()    }    // 2->在主线程执行    NSOperationQueue.mainQueue().addOperationWithBlock {        print("mainQueue")        self.getThreadInfo()    }}

通常,我都是这样使用子线程的:

NSOperationQueue().addOperationWithBlock {    print("runOnThread")    self.getThreadInfo()}

源码: https://github.com/angcyo/ThreadDemo

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