用慣了GCD就人云亦云的對NSOperation有各種各樣的抱怨,但NSOperation也有其獨到的優勢.

                //創建NSInvocationOperation對象，封裝操作                NSInvocationOperation *operation1=[[NSInvocationOperation alloc]initWithTarget:self selector:@selector(initAllRoom) object:nil];                 _queue=[[NSOperationQueue alloc]init];                //把操作添加到隊列中                [_queue addOperation:operation1];可利用 cancelAllOperations等來進行中止線程操作等.