IOS 跳转页面

1. 跳转界面，关闭自身

LoginViewController *loginViewController = [[LoginViewController alloc]initWithNibName:@"LoginViewController" bundle:nil];

    [self presentViewController:loginViewController animated:YES completion:^{

    } ];

ios6以前是presentModalViewController；

2. 关闭当前视图

 [self dismissViewControllerAnimated:YES completion:nil];

ios6以前是dismissModalViewController