【iOS 】把一些不太重要的任务放在空时执行

-(void)idleNotificationMethod
{

}

-(void)registerForIdleNotification
{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(idleNotificationMethod) name:@"IdleNotification" object:nil];
    NSNotification *notification = [NSNotification notificationWithName:@"IdleNotification" object:nil];
    [[NSNotificationQueue defaultQueue] enqueueNotification:notification postingStyle:NSPostWhenIdle];
}