dispatch_group_async

最新推荐文章于 2024-02-19 09:21:47 发布

转载最新推荐文章于 2024-02-19 09:21:47 发布 · 113 阅读

0 ·

CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/joesen/p/3782164.html

本文介绍了一个iOS应用中使用Grand Central Dispatch (GCD)来执行多个异步任务并在主线程更新UI的例子。通过dispatch_group创建一组任务，并在所有任务完成后通知主线程执行特定操作。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
    dispatch_group_t group = dispatch_group_create();
    
    dispatch_group_async(group, queue, ^{
        [NSThread sleepForTimeInterval:1];
        [self group1];
    });
    dispatch_group_async(group, queue, ^{
        [NSThread sleepForTimeInterval:5];
        [self group2];
    });
    dispatch_group_async(group, queue, ^{
        [NSThread sleepForTimeInterval:10];
        [self group3];
    });
    dispatch_group_notify(group, dispatch_get_main_queue(), ^{
        NSLog(@"updateUi"); 
    }); 
    dispatch_release(group);
}

- (void)group1
{
    NSLog(@"%s", __FUNCTION__);
}

- (void)group2
{
    NSLog(@"%s",__FUNCTION__);
}

- (void)group3
{
    NSLog(@"%s",__FUNCTION__);
}