本文共 762 字，大约阅读时间需要 2 分钟。

为了同步可以用下面的代码

- (void)viewDidLoad{    num = 100;            NSThread *thread1 =[[NSThread alloc]initWithTarget:self selector:@selector(showData) object:nil];        [thread1 setName:@"thread--1"];        NSThread *thread2 =[[NSThread alloc]initWithTarget:self selector:@selector(showData) object:nil];        [thread2 setName:@"thread--2"];        [thread1 start];    [thread2 start];            lock = [[NSLock alloc]init];    }

-(void)showData{    while (TRUE)    {                [lock lock];                if(num > 0)        {            [NSThread sleepForTimeInterval:0.3];             NSLog(@"当前%d,线程名:%@",num,[[NSThread currentThread] name]);            num--;        }        else        {            break;        }        [lock unlock];    }}

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