Access modal view controller parent
I'm presenting a ViewController modally. How can I access the parent view controller ?
My architecture is TabBarController=>VC1=>VC2=>VC3=>MVC1, and I want to reach VC3 from MVC1.
In VC3, I have this code :
- (void) editAd{
AskPasswordViewController *modalViewController = [[AskPasswordViewController alloc] initWithNibName:@"AskPasswordView" bundle:nil];
NSLog(@"modalparent class=%@", [[modalViewController parentViewController] class]);
[self presentModalViewController:modalViewController animated开发者_JAVA技巧:YES];
[modalViewController release];
}
I tried this in MVC1:
- (void) sendRequest {
NSLog(@"classe : %@",[[self parentViewController] class] );
}
but it returns my TabBarViewController...
You can access parent by calling:
self.presentingViewController
As per apple documentation:
The view controller that presented this view controller (or its farthest ancestor.)
The way I'd go about something like this is to simply create a delegate. In AskPasswordViewController
's header, put
id delegate;
and
@property (nonatomic, assign) id delegate;
Synthesize it in the implementation file. Then after you alloc/init the modal controller, and before you present it, set modalViewController.delegate = self;
. Then within the modal controller, you can call self.delegate
to get information from the view controller that presented it. I hope this helps
You can always go further back just by calling parentViewController like so:
self.parentViewController.parentViewController
.... and so on until you reach the right one.
Addition to Vibhor Goyal - Sometimes, self.presentingViewController registers as NavigationController. Therefore try:
if let vc = self.presentingViewController.childViewControllers.last as? YourViewController {
// do stuff here
}
Here I came up with universal method to navigate from any place to root.
You create a new Class file with this class, so that it's accessible from anywhere in your project:
import UIKit class SharedControllers { static func navigateToRoot(viewController: UIViewController) { var nc = viewController.navigationController // If this is a normal view with NavigationController, then we just pop to root. if nc != nil { nc?.popToRootViewControllerAnimated(true) return } // Most likely we are in Modal view, so we will need to search for a view with NavigationController. let vc = viewController.presentingViewController if nc == nil { nc = viewController.presentingViewController?.navigationController } if nc == nil { nc = viewController.parentViewController?.navigationController } if vc is UINavigationController && nc == nil { nc = vc as? UINavigationController } if nc != nil { viewController.dismissViewControllerAnimated(false, completion: { nc?.popToRootViewControllerAnimated(true) }) } } }
Usage from anywhere in your project:
{ ... SharedControllers.navigateToRoot(self) ... }
//You have to get the root, iterate through the root's ViewControllers and then ask for the ParentViewController.
UINavigationController *root = (UINavigationController*)[[(AppDelegate*) [[UIApplication sharedApplication]delegate] window] rootViewController];
for (UIViewController *VC in root.viewControllers) {
if([VC isKindOfClass:[YourParentViewController class]]){
YourParentViewController* parent = (YourParentViewController*)VC;
[parent callMethod]; // your code here
[self dismissViewControllerAnimated:YES completion:nil];
}
}
If presentingViewController
gives you unexpected results and you don't want to fiddle with it, just do:
class MyViewController: UIViewController {
private weak var presenter: UIViewController?
init(presenter: UIViewController) {
self.presenter = presenter
super.init(nibName: nil, bundle: nil)
...
}
...
}
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