I created a sub-thread using NSThread in main thread
NSThread *newThread = [[NSThread alloc] initWithTarget:self selector:@selector(MyThread:) object:timer];
5 sec later,i used [newThread cancel] in main thread to stop the sub-thread,but it didnt work,
Method MyThread: in newThread still working
so,whats the correct answer to stop newThread,THX
actually [newThread isCancelled] is YES,but selector MyThread was still woking