//后台执行
dispatch_async(dispatch_get_global_queue(
0,
0), ^
{
//something
});
//主线程执行
dispatch_async(dispatch_get_main_queue(),^
{
//something
});
//一次性执行
static dispatch_once_t onceToken;
dispatch_once(&onceToken,^
{
// code to be executed once
});
//延迟2秒执行
double delayInSeconds =
2.0;
dispatch_time_t popTime =
dispatch_time(DISPATCH_TIME_NOW,delayInSeconds * NSEC_PER_SEC); dispatch_after(popTime, dispatch_get_main_queue(), ^(void){//code to be executed on the main queue after delay
});
//自定义dispatch_queue_t
dispatch_queue_t urls_queue = dispatch_queue_create(
"blog.devtang.com", NULL);
dispatch_async(urls_queue, ^
{
//yuro code
});
dispatch_release(urls_queue);
//合并汇总结果
dispatch_group_t group =
dispatch_group_create();
dispatch_group_async(group, dispatch_get_global_queue(0,
0), ^
{
//并行执行的线程一
});
dispatch_group_async(group, dispatch_get_global_queue(0,
0), ^
{
//并行执行的线程二
});
dispatch_group_notify(group, dispatch_get_global_queue(0,
0), ^
{
//汇总结果
});
转载于:https://www.cnblogs.com/chenziqiang/p/4939368.html
