在開發(fā)中,遇到N個網(wǎng)絡(luò)請求都完成后更新UI的需求,這時使用dispatch_group_async就比較簡單,具體使用為:
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, ^{
NSLog(@"request1");
});
dispatch_group_async(group, queue, ^{
NSLog(@"request1");
});
dispatch_group_notify(group,dispatch_get_main_queue(),^{
NSLog("updateUI");
})
