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java多線程應用場景，IOS高級開發之多線程（五）NSOperation 2

 2023-10-06 阅读 24 评论 0

摘要：接著看NSOperation、NSOperationQueue線程間的通信： 應用場景：比如我們經常把一些耗時的操作比如下載圖片放在子線程，那么當這個完成之后，我們就需要回到主線程，這個時候就需要用到線程間的通信。 來看下代碼： //線程間通信 -(void

接著看NSOperation、NSOperationQueue線程間的通信：

應用場景：比如我們經常把一些耗時的操作比如下載圖片放在子線程，那么當這個完成之后，我們就需要回到主線程，這個時候就需要用到線程間的通信。

來看下代碼：

//線程間通信
-(void)communication{//1.創建隊列NSOperationQueue *queue = [[NSOperationQueue alloc] init];//2.添加操作[queue addOperationWithBlock:^{//異步進行的耗時操作for (int i=0; i<2; ++i) {[NSThread sleepForTimeInterval:2.0];//模擬耗時操作NSLog(@"1----%@",[NSThread currentThread]);//打印當前線程}//回到主線程[[NSOperationQueue mainQueue] addOperationWithBlock:^{//進行UI刷新操作for (int i=0; i<2; ++i) {[NSThread sleepForTimeInterval:2.0];NSLog(@"2----%@",[NSThread currentThread]);}}];}];
}

java多線程應用場景？　　來看打印：

2019-04-09 11:25:34.507056+0800 MyNSOperation[2488:37353] 1----<NSThread: 0x600000082840>{number = 3, name = (null)}
2019-04-09 11:25:36.510730+0800 MyNSOperation[2488:37353] 1----<NSThread: 0x600000082840>{number = 3, name = (null)}
2019-04-09 11:25:38.513231+0800 MyNSOperation[2488:37047] 2----<NSThread: 0x6000000e29c0>{number = 1, name = main}
2019-04-09 11:25:40.516515+0800 MyNSOperation[2488:37047] 2----<NSThread: 0x6000000e29c0>{number = 1, name = main}

　　可以看到，在子線程進行異步操作后，回到了主線程。

再來看下NSOperation與NSOperationQueue的線程同步與線程安全

我們來看一個經典的賣火車票的例子，假如我們不考慮線程安全是啥情況。

/*非線程安全，不用鎖*/
-(void)initTicketStatusNotSafe{NSLog(@"currentThread---%@",[NSThread currentThread]);self.ticketCount = 50;//1.創建queue1,queue1代表北京售票窗口NSOperationQueue *queue1 = [[NSOperationQueue alloc] init];queue1.maxConcurrentOperationCount = 1;//2.創建queue2.queue2代表上海售票窗口NSOperationQueue *queue2 = [[NSOperationQueue alloc] init];queue2.maxConcurrentOperationCount = 1;//3.創建賣票的操作NSBlockOperation *op1 = [NSBlockOperation blockOperationWithBlock:^{[self saleTicketNotSafe];}];//4.創建賣票操作NSBlockOperation *op2 = [NSBlockOperation blockOperationWithBlock:^{[self saleTicketNotSafe];}];//5.開始賣票[queue1 addOperation:op1];[queue2 addOperation:op2];
}//售賣火車票
-(void)saleTicketNotSafe{while(true){if (self.ticketCount>0) {//如果還有票，就繼續賣self.ticketCount--;NSLog(@"%@",[NSString stringWithFormat:@"剩余票數:%d 窗口%@",self.ticketCount,[NSThread currentThread]]);[NSThread sleepForTimeInterval:2.0];}else{NSLog(@"所有的火車票已售完");break;}}
}

做ios開發需要學什么，　　看打印情況：

2019-04-09 11:57:13.000691+0800 MyNSOperation[3785:58834] currentThread---<NSThread: 0x600002ad1240>{number = 1, name = main}
2019-04-09 11:57:13.006247+0800 MyNSOperation[3785:58934] 剩余票數:49 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:13.006501+0800 MyNSOperation[3785:58932] 剩余票數:48 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:15.011866+0800 MyNSOperation[3785:58934] 剩余票數:47 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:15.011959+0800 MyNSOperation[3785:58932] 剩余票數:46 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:17.015980+0800 MyNSOperation[3785:58934] 剩余票數:45 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:17.015980+0800 MyNSOperation[3785:58932] 剩余票數:45 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:19.020346+0800 MyNSOperation[3785:58934] 剩余票數:43 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:19.020354+0800 MyNSOperation[3785:58932] 剩余票數:44 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:21.026026+0800 MyNSOperation[3785:58934] 剩余票數:42 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:21.026112+0800 MyNSOperation[3785:58932] 剩余票數:41 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:23.026638+0800 MyNSOperation[3785:58934] 剩余票數:39 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:23.026648+0800 MyNSOperation[3785:58932] 剩余票數:40 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:25.031698+0800 MyNSOperation[3785:58934] 剩余票數:38 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:25.031763+0800 MyNSOperation[3785:58932] 剩余票數:37 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:27.032664+0800 MyNSOperation[3785:58934] 剩余票數:36 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:27.032664+0800 MyNSOperation[3785:58932] 剩余票數:35 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:29.036969+0800 MyNSOperation[3785:58934] 剩余票數:34 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:29.037052+0800 MyNSOperation[3785:58932] 剩余票數:33 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:31.041413+0800 MyNSOperation[3785:58934] 剩余票數:31 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:31.041416+0800 MyNSOperation[3785:58932] 剩余票數:32 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:33.044314+0800 MyNSOperation[3785:58934] 剩余票數:30 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:33.044314+0800 MyNSOperation[3785:58932] 剩余票數:29 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:35.049399+0800 MyNSOperation[3785:58934] 剩余票數:28 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:35.049449+0800 MyNSOperation[3785:58932] 剩余票數:28 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:37.054456+0800 MyNSOperation[3785:58934] 剩余票數:27 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:37.054456+0800 MyNSOperation[3785:58932] 剩余票數:27 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:39.057780+0800 MyNSOperation[3785:58934] 剩余票數:26 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:39.057780+0800 MyNSOperation[3785:58932] 剩余票數:26 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:41.058922+0800 MyNSOperation[3785:58932] 剩余票數:25 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:41.058922+0800 MyNSOperation[3785:58934] 剩余票數:25 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:43.062224+0800 MyNSOperation[3785:58932] 剩余票數:24 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:43.062312+0800 MyNSOperation[3785:58934] 剩余票數:23 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:45.066320+0800 MyNSOperation[3785:58934] 剩余票數:21 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:45.066320+0800 MyNSOperation[3785:58932] 剩余票數:22 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:47.070458+0800 MyNSOperation[3785:58934] 剩余票數:20 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:47.070470+0800 MyNSOperation[3785:58932] 剩余票數:20 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:49.072585+0800 MyNSOperation[3785:58934] 剩余票數:19 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:49.072585+0800 MyNSOperation[3785:58932] 剩余票數:18 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:51.076732+0800 MyNSOperation[3785:58934] 剩余票數:17 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:51.076732+0800 MyNSOperation[3785:58932] 剩余票數:16 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:53.081887+0800 MyNSOperation[3785:58932] 剩余票數:15 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:53.081887+0800 MyNSOperation[3785:58934] 剩余票數:15 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:55.084748+0800 MyNSOperation[3785:58934] 剩余票數:14 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:55.084752+0800 MyNSOperation[3785:58932] 剩余票數:13 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:57.087508+0800 MyNSOperation[3785:58934] 剩余票數:11 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:57:57.087508+0800 MyNSOperation[3785:58932] 剩余票數:12 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:59.092573+0800 MyNSOperation[3785:58932] 剩余票數:10 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:57:59.092573+0800 MyNSOperation[3785:58934] 剩余票數:10 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:58:01.096928+0800 MyNSOperation[3785:58934] 剩余票數:8 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:58:01.096928+0800 MyNSOperation[3785:58932] 剩余票數:9 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:58:03.102158+0800 MyNSOperation[3785:58934] 剩余票數:6 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:58:03.102075+0800 MyNSOperation[3785:58932] 剩余票數:7 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:58:05.106820+0800 MyNSOperation[3785:58934] 剩余票數:5 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:58:05.106821+0800 MyNSOperation[3785:58932] 剩余票數:4 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:58:07.110551+0800 MyNSOperation[3785:58932] 剩余票數:3 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:58:07.110571+0800 MyNSOperation[3785:58934] 剩余票數:3 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:58:09.115589+0800 MyNSOperation[3785:58932] 剩余票數:1 窗口<NSThread: 0x600002ab8040>{number = 4, name = (null)}
2019-04-09 11:58:09.115589+0800 MyNSOperation[3785:58934] 剩余票數:2 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:58:11.117467+0800 MyNSOperation[3785:58932] 所有的火車票已售完
2019-04-09 11:58:11.117476+0800 MyNSOperation[3785:58934] 剩余票數:0 窗口<NSThread: 0x600002a87c00>{number = 3, name = (null)}
2019-04-09 11:58:13.120972+0800 MyNSOperation[3785:58934] 所有的火車票已售完

　　可以看到，有多個票數得到的是重復的，錯亂的。

所有我們要解決線程安全的問題，使用鎖。在一個線程操作一個資源的時候，給這個資源加鎖，不允許其他線程進行操作。IOS中實現線程加鎖的方式是有很多種的。比如@synchronized,NSLock,NSRecursiveLock,NSConditionLock等等多種方式。我們這里使用NSLock的方式來給線程加鎖。

我們來看下使用線程安全的代碼：

/*線程安全的代碼，使用NSLock鎖初始化火車票數量，賣票窗口(線程安全)，并開始賣票*/
-(void)initTicketStatusSafe{NSLog(@"currentThread----%@",[NSThread currentThread]);self.ticketCount = 50;self.lock = [[NSLock alloc] init];//1.創建queue1,queue1代表北京售票窗口NSOperationQueue *queue1 = [[NSOperationQueue alloc] init];queue1.maxConcurrentOperationCount = 1;//2.創建queue2,queue2代表上海售票窗口NSOperationQueue *queue2 = [[NSOperationQueue alloc] init];queue2.maxConcurrentOperationCount = 1;//3.創建賣票操作op1NSBlockOperation *op1 = [NSBlockOperation blockOperationWithBlock:^{[self saleTicketSafe];}];//4.創建賣票操作op2NSBlockOperation *op2 = [NSBlockOperation blockOperationWithBlock:^{[self saleTicketSafe];}];//5.添加操作，開始賣票[queue1 addOperation:op1];[queue2 addOperation:op2];
}//售賣火車票(線程安全)
-(void)saleTicketSafe{while (true) {//加鎖[self.lock lock];if(self.ticketCount>0){//如果還有票的話，就繼續賣票self.ticketCount--;NSLog(@"%@",[NSString stringWithFormat:@"剩余票數:%d,窗口:%@",self.ticketCount,[NSThread currentThread]]);[NSThread sleepForTimeInterval:2.0];}//解鎖[self.lock unlock];if(self.ticketCount<=0){NSLog(@"所有票已經賣完");break;}}
}

ios開發網頁。　　來看打印：

2019-04-09 15:29:44.182861+0800 MyNSOperation[10565:159368] currentThread----<NSThread: 0x60000063f780>{number = 1, name = main}
2019-04-09 15:29:44.186854+0800 MyNSOperation[10565:159459] 剩余票數:49,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:29:46.187749+0800 MyNSOperation[10565:159449] 剩余票數:48,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:29:48.190175+0800 MyNSOperation[10565:159459] 剩余票數:47,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:29:50.193962+0800 MyNSOperation[10565:159449] 剩余票數:46,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:29:52.199454+0800 MyNSOperation[10565:159459] 剩余票數:45,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:29:54.203206+0800 MyNSOperation[10565:159449] 剩余票數:44,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:29:56.207794+0800 MyNSOperation[10565:159459] 剩余票數:43,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:29:58.213412+0800 MyNSOperation[10565:159449] 剩余票數:42,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:30:00.214024+0800 MyNSOperation[10565:159459] 剩余票數:41,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:30:02.219388+0800 MyNSOperation[10565:159449] 剩余票數:40,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:30:04.224701+0800 MyNSOperation[10565:159459] 剩余票數:39,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:30:06.230349+0800 MyNSOperation[10565:159449] 剩余票數:38,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:30:08.233439+0800 MyNSOperation[10565:159459] 剩余票數:37,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:30:10.236390+0800 MyNSOperation[10565:159449] 剩余票數:36,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:30:12.239285+0800 MyNSOperation[10565:159459] 剩余票數:35,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:30:14.242919+0800 MyNSOperation[10565:159449] 剩余票數:34,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:30:16.246876+0800 MyNSOperation[10565:159459] 剩余票數:33,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:30:18.252321+0800 MyNSOperation[10565:159449] 剩余票數:32,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:30:20.253964+0800 MyNSOperation[10565:159459] 剩余票數:31,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:30:22.254687+0800 MyNSOperation[10565:159449] 剩余票數:30,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:30:24.255193+0800 MyNSOperation[10565:159459] 剩余票數:29,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:30:26.256679+0800 MyNSOperation[10565:159449] 剩余票數:28,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:30:28.261450+0800 MyNSOperation[10565:159459] 剩余票數:27,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:30:30.262594+0800 MyNSOperation[10565:159449] 剩余票數:26,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:30:32.267232+0800 MyNSOperation[10565:159459] 剩余票數:25,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:30:34.271705+0800 MyNSOperation[10565:159449] 剩余票數:24,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:30:36.275290+0800 MyNSOperation[10565:159459] 剩余票數:23,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:30:38.278967+0800 MyNSOperation[10565:159449] 剩余票數:22,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:30:40.284568+0800 MyNSOperation[10565:159459] 剩余票數:21,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:30:42.288319+0800 MyNSOperation[10565:159449] 剩余票數:20,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:30:44.293916+0800 MyNSOperation[10565:159459] 剩余票數:19,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:30:46.298411+0800 MyNSOperation[10565:159449] 剩余票數:18,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:30:48.301898+0800 MyNSOperation[10565:159459] 剩余票數:17,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:30:50.307369+0800 MyNSOperation[10565:159449] 剩余票數:16,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:30:52.309734+0800 MyNSOperation[10565:159459] 剩余票數:15,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:30:54.312124+0800 MyNSOperation[10565:159449] 剩余票數:14,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:30:56.313696+0800 MyNSOperation[10565:159459] 剩余票數:13,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:30:58.315219+0800 MyNSOperation[10565:159449] 剩余票數:12,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:31:00.317869+0800 MyNSOperation[10565:159459] 剩余票數:11,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:31:02.322281+0800 MyNSOperation[10565:159449] 剩余票數:10,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:31:04.326708+0800 MyNSOperation[10565:159459] 剩余票數:9,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:31:06.332550+0800 MyNSOperation[10565:159449] 剩余票數:8,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:31:08.336064+0800 MyNSOperation[10565:159459] 剩余票數:7,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:31:10.341717+0800 MyNSOperation[10565:159449] 剩余票數:6,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:31:12.342312+0800 MyNSOperation[10565:159459] 剩余票數:5,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:31:14.347439+0800 MyNSOperation[10565:159449] 剩余票數:4,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:31:16.348122+0800 MyNSOperation[10565:159459] 剩余票數:3,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:31:18.352838+0800 MyNSOperation[10565:159449] 剩余票數:2,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:31:20.355310+0800 MyNSOperation[10565:159459] 剩余票數:1,窗口:<NSThread: 0x600000663740>{number = 3, name = (null)}
2019-04-09 15:31:22.358857+0800 MyNSOperation[10565:159449] 剩余票數:0,窗口:<NSThread: 0x600000658bc0>{number = 4, name = (null)}
2019-04-09 15:31:24.363256+0800 MyNSOperation[10565:159449] 所有票已經賣完
2019-04-09 15:31:24.363263+0800 MyNSOperation[10565:159459] 所有票已經賣完

　　可以看出，在使用了線程安全機制之后，票數正常了。

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轉載于:https://www.cnblogs.com/howlaa/p/10677242.html

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