UIAlertView clickedButtonAtIndex with presentModalViewController

Question

我正在尝试通过来自UIAlertView按钮的presentModalViewController调用视图。代码如下，NSlog显示在控制台中，所以我知道代码执行确实达到了这一点。此外，没有错误或显示任何内容：

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {

if (buttonIndex != [alertView cancelButtonIndex])
{
    NSLog(@" The username is: %@ AND the password is: %@ ",textField.text,passTextField.text);

 // do some logic in here later 

    CompanyViewController *companyViewController = [[[CompanyViewController alloc] initWithNibName:@"CompanyViewController" bundle:nil] autorelease];  
    [self presentModalViewController:companyViewController animated:YES];
}
[textField resignFirstResponder];
[passTextField resignFirstResponder];

}

*****编辑：上面的方法属于UIViewController。以下是界面文件：

@interface testingViewController : UIViewController  <UITextFieldDelegate>
{
UITextField *textField;
UITextField *passTextField;
}
@property (nonatomic, retain) UITextField *textField;
@property (nonatomic, retain) UITextField *passTextField;
@property (readonly) NSString *enteredText;
@property (readonly) NSString *enteredPassword;

@end

感谢任何帮助。

Answer 1

可能是你试图从不是viewController的东西调用presentModalViewController？例如，视图。

Answer 2

尝试使用与导航控制器不同的东西：

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {

  if (buttonIndex != [alertView cancelButtonIndex])
  {

      CompanyViewController *companyViewController = [[CompanyViewController alloc] init];
      UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:companyViewController];

      [self.navigationController presentModalViewController:navController animated:YES];
      [navController release];
  }

}

希望能有效..