点击登录按钮，跳转到登录的ViewController，为什么我的不跳转呢，帮忙看下

C/C++ code

- (IBAction)btnLoginClick {    LoginViewController *loginView = [[LoginViewController alloc] initWithNibName:@"LoginViewController" bundle:nil];    //UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:loginView];    //[self.navigationController presentModalViewController:nav animated:YES];    //[self.navigationController pushViewController:loginView animated:YES];    [self.navigationController presentModalViewController:loginView animated:YES];    //[nav release];    [loginView release];    NSLog(@"aaa");}

注释掉的我也试过 都不行，还是没动静，控制台输出了 aaa

[解决办法]
[self presentModalViewController:loginView animated:YES];

navigationController 应该没初始化
[解决办法]
1. NSAssert(self.navigationController != nil, @"nothing");

2. Breakpoint debug