swift详解之十五------------NSThread线程同步锁

迈不过友情╰ 2022-08-04 13:00 254阅读 0赞

## NSThread线程同步锁 ##

--------------------

上小节用NSThread实现读取网络图片 ， 这节用`NSThread` 模拟一个卖票的例子 。用`NSLock` 或者`NSCondition` 锁定资源

var total = 100 //总票数
        var w1 = 0  //窗口1卖出票数
        var w2 = 0   //窗口2卖出票数
        var isSell = true  //是否出售
        var lock:NSLock?   
        var condition:NSCondition?

这里首先定义一些变量

然后再点击卖票的时候，开启连个线程模仿窗口

lock = NSLock()
            condition = NSCondition()
            //setTicketValue()
            let thread1 = NSThread(target: self, selector: "run", object: nil)
            thread1.name = "thread-1"
            thread1.start()
    
            let thread2 = NSThread(target: self, selector: "run", object: nil)
            thread2.name = "thread-2"
            thread2.start()

func run(){
            while(isSell){
                lock?.lock()
    
                if(total>0){
                    NSThread.sleepForTimeInterval(0.2);
    
                    total--
                    if(NSThread.currentThread().name == "thread-1")
                    {
                        w1++
                    }else if(NSThread.currentThread().name == "thread-2"){
                        w2++
                    }
                    dispatch_async(dispatch_get_main_queue()) {
    
                        self.setTicketValue()
                    }
    
                }else{
    
                    dispatch_async(dispatch_get_main_queue()) {
    
                        self.totalTicks.text = "票卖完啦"
                        self.isSell = false
                    }
    
                }
    
                lock?.unlock()
            }
        }

![这里写图片描述][20150828210939559]

大概就是这样的一个小示例 。  
源码下载地址：[源码][Link 1]

> 学习iOS，有他就够了，[小码哥视频，传智、黑马、各种swift书籍][swift]

[20150828210939559]: /images/20220731/cb203ea851194b68bbdf762ef5718288.png
[Link 1]: http://download.csdn.net/detail/u010586842/9059463
[swift]: https://item.taobao.com/item.htm?spm=a230r.1.14.85.JFN9U2&id=529819836478&ns=1&abbucket=7#detail