打开模态视图 导航

//打开模态视图    [self presentViewController:self.detailVC animated:YES completion:nil];//关闭模态视图[self dismissViewControllerAnimated:YES completion:nil];

//添加导航[self.navigationController pushViewController:self.detailVC animated:YES];//回退[self.navigationController popViewControllerAnimated:YES];

 //创建通知，然后每隔一段时间发送出去 [NSTimer scheduledTimerWithTimeInterval:5.0f target:self selector:@selector(doSomething:) userInfo:nil repeats:YES]; //订阅通知(通过通知中心订阅) [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(doSomething:) name:@"DATETIME" object:nil];