摘要：- (IBAction)blockQueue:(UIButton *)sender { NSOperationQueue *queue = [[NSOperationQueue alloc]init]; NSBlockOperation * operation = [NSBloc... 阅读全文

摘要：创建NSOperationQueue 对象NSOperationQueue *queue = [[NSOperationQueue alloc]init];创建NSInvocationOperation对象NSInvocationOperation *operation = [[NSInvocati... 阅读全文