NSOperation-NSBlockOperation

最新推荐文章于 2017-05-16 11:05:00 发布

yxcharles

最新推荐文章于 2017-05-16 11:05:00 发布

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分类专栏： iOS多线程

本文链接：https://blog.youkuaiyun.com/CharlesYaoxin/article/details/47614283

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本文通过具体的代码示例介绍了如何使用NSOperationQueue来并发执行多个操作，并展示了如何为NSBlockOperation添加额外的执行块以实现更复杂的异步任务管理。

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- (void)test {
    NSBlockOperation *operation = [NSBlockOperation blockOperationWithBlock:^{
        NSLog(@"---- download%@",[NSThread currentThread]);
    }];
    
    [operation addExecutionBlock:^{
        NSLog(@"-----download2 %@",[NSThread currentThread]);
    }];
    [operation addExecutionBlock:^{
        NSLog(@"-----download3%@",[NSThread currentThread]);
    }];
    [operation start];
    // 任务个数如果 > 1才会开始异步执行
}

// 先并发执行四个operation 再执行 add的block 事件
    NSBlockOperation *operation = [NSBlockOperation blockOperationWithBlock:^{
        NSLog(@"download00 -- %@",[NSThread currentThread]);
    }];
    
    [operation addExecutionBlock:^{
        NSLog(@"download01 %@",[NSThread currentThread]);
    }];
    //---------
    
    NSBlockOperation *operation1 = [NSBlockOperation blockOperationWithBlock:^{
        NSLog(@"download1 -- %@",[NSThread currentThread]);
    }];
    
    NSBlockOperation *operation2 = [NSBlockOperation blockOperationWithBlock:^{
        NSLog(@"download2 -- %@",[NSThread currentThread]);
    }];
    
    NSBlockOperation *operation3 = [NSBlockOperation blockOperationWithBlock:^{
        NSLog(@"download3 -- %@",[NSThread currentThread]);
    }];
    
    // 1.创建队列
    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
//    NSOperationQueue *queue = [NSOperationQueue mainQueue];
    // 2.添加任务  自动异步执行
    [queue addOperation:operation];
    [queue addOperation:operation1];
    [queue addOperation:operation2];
    [queue addOperation:operation3];