iOS边练边学--多线程介绍、NSThread的简单实用、线程安全以及线程之间的通信

 1 #import "ViewController.h"
 2 
 3 @interface ViewController ()
 4 /** Thread01 */
 5 @property(nonatomic,strong) NSThread *thread01;
 6 /** Thread02 */
 7 @property(nonatomic,strong) NSThread *thread02;
 8 /** Thread03 */
 9 @property(nonatomic,strong) NSThread *thread03;
10 /** ticketCount */
11 @property(nonatomic,assign) NSInteger ticketCount;
12 @end
13 
14 @implementation ViewController
15 
16 - (void)viewDidLoad {
17     [super viewDidLoad];
18     
19     self.ticketCount = 100;
20     
21     // 线程创建之后不执行start  出了大括号会被销毁，所以这里用成员变量存了起来
22     self.thread01 = [[NSThread alloc] initWithTarget:self selector:@selector(saleTicket) object:nil];
23     self.thread01.name = @"售票员01";
24     self.thread02 = [[NSThread alloc] initWithTarget:self selector:@selector(saleTicket) object:nil];
25     self.thread02.name = @"售票员02";
26     self.thread03 = [[NSThread alloc] initWithTarget:self selector:@selector(saleTicket) object:nil];
27     self.thread03.name = @"售票员03";
28 }
29 
30 - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
31     
32     [self.thread01 start];
33     [self.thread02 start];
34     [self.thread03 start];
35     
36 }
37 
38 - (void)saleTicket
39 {
40     @synchronized(self) { // 添加互斥锁，括号中的什么对象都可以，但是必须是同一个！
41         
42         while (1) {
43             // 取出剩余票总数
44             NSInteger count = self.ticketCount;
45             if (count > 0) {
46                 self.ticketCount = count - 1;
47                 NSLog(@"%@卖出了车票，还剩%ld",[NSThread currentThread].name,self.ticketCount);
48             } else {
49                 
50                 NSLog(@"%@把车票卖完了",[NSThread currentThread].name);
51                 break;
52             }
53             
54         }
55     }
56 }
57 
58 @end