NSOperationQueue 依赖操作

NSOperationQueue * operationQueue = [[NSOperationQueue alloc]init];

    NSInvocationoperation * invocationop = [[NSInvocationoperation alloc]initWithTarget:self selector:@selector(invocationRun) object:nil];
    NSBlockOperation * blockOp = [NSBlockOperation blockOperationWithBlock:^{
        NSLog(@"blockOpRun_0");
    }];
    //invocationop 依赖 blockOp => 也就是说 先执行 blockOp 然后再执行invocationop
    [invocationop addDependency:blockOp];

    [operationQueue addOperation:invocationop];
    [operationQueue addOperation:blockOp];