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
- (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");}