iOS多线程之NSThread

NSThread的使用有三种方法：

1. 使用alloc和start

    NSThread *thread1 = [[NSThread alloc] initWithTarget:self selector:@selector(runThread1) object:nil];
    [thread1 start];

2. 使用detachNewThreadSelector

    [NSThread detachNewThreadSelector:@selector(runThread1) toTarget:self withObject:nil];

3. 使用performSelectorInBackground

    [self performSelectorInBackground:@selector(runThread1) withObject:nil];

获得当前线程：

[NSThread currentThread];

NSThread锁（使线程中的共享数据不会错乱，相互干扰）：

1. 使用@synchronized

    @synchronized (self) {
    }

2. 使用NSCondition（lock和unlock必须成对出现）

    @property (nonatomic, strong) NSCondition *ticketCondition;
    self.ticketCondition = [[NSCondition alloc] init];
    [self.ticketCondition lock];
    ...
    [self.ticketCondition unlock];