Click the login button to jump to login ViewController, why I do not jump it, to help look

 - (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"); 
} 

I also tried not commented out the line, or not moving, the console output of the aaa
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Yeah a lot of comment lines
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[Self presentModalViewController: loginView animated: YES];

navigationController should not initialize
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1. NSAssert (self.navigationController! = Nil, @ "nothing");

2. Breakpoint debug

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Controls are not bound class matter? ?