通過NavigationController傳遞數據

Question

我有一個UIViewController嵌入UINavigationController。我想介紹這viewController和呈現後，我也需要導航方法（推&波普），所以我提出UINavigationController而不是UIViewController，但爲此，我需要傳遞自定義數據到ViewController作爲我沒有訪問該ViewController形式以前ViewController。 這是我的代碼。

UINavigationController *navigationController = [self.storyboard instantiateViewControllerWithIdentifier:@"MyNavigationIdentity"]]; 

[self presentViewController:navigationController animated:YES completion:nil]; 

P.S我不能alloc和init新navigationController爲我設計我的navigationController從故事板。

Answer 1

您可以訪問的UINavigationController您viewController從viewControllers屬性只是訪問ViewController嵌入您的UINavigationController內。

if (navigationController.viewControllers.count > 0) { 
    //Cast UIViewController with your custom Controller 
    ViewController *vc = (ViewController*) [navigationController.viewControllers firstObject]; 
    //Now pass data you want 
    vc.passData = ... 
} 

Answer 2

您可以使用childViewControllers財產

NSArray *viewControllers = [navigationController childViewControllers]; 
if (viewControllers.count > 0) { 
    UIViewController *myViewController = (UIViewController *)[viewControllers firstObject]; 
}