NSOperationによるマルチスレッド

NSThreadの感覚で利用できるNSOperationの方法：

プロパティ：
NSOperationQueue *queue;

メソッド：
- (void)awakeFromNib
{
NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(subThreadMethod:) object:nil];
queue = [[NSOperationQueue alloc] init];
[queue addOperation:operation];
}

- (void)subThreadMethod:(id)object
{
NSLog(@"SUB THREAD");
}