Objective-c中线程NSThread的使用

thread = [[NSThread alloc]initWithTarget:self selector:@selector(startMonitor) object:nil];
[thread start];

- (void)getInfo:(id)sender
{
if (!running) {
NSLog(@"start monitor");
thread = [[NSThread alloc]initWithTarget:self selector:@selector(startMonitor) object:nil];
[thread start];
running = true;
}
else{
NSLog(@"stop monitor");
[thread cancel];
running = false;
}
}

- (void) startMonitor
{
while (true) {
if ([[NSThread currentThread] isCancelled]) {
[NSThread exit];
}
//do your things here
sleep(1);
};
}