How to create a back button in a view controller t

问题:

hi I have a view controller with a container and in the container a child view with a collection view when the user taps the collection view cell it sends me to detail view controller but now what i want to do is to add a back button in my detail view controller which sends me to the parentViewController

回答1:

Case 1 : Unwind Segue

This will work perfect according to your situation:

iOS Unwind Segue

Unwind Segues give you a way to “unwind” the navigation stack and specify a destination to go back to.

Case 2 : PopToRootViewController

If you Parent view is also your Root view controller, then you can easily get back using popToRootViewControllerAnimated:YES.

Create own back button add it to navigation bar with method backButtonTouch.

self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"Back", nil) style:UIBarButtonItemStyleDone target:self action:@selector(backButtonTouch:)]; 

Add above code into viewDidLoad.

-(void)backButtonTouch:(id)sender{
    [self.navigationController popToRootViewControllerAnimated:YES];
}

回答2:

1. If you want to customise the back button, first hide the navigation bar

   [self.navigationController setNavigationBarHidden:YES];

2. Now add a button, and create its touchUpInside event, in that event pop the controller

   [self.navigationController popViewControllerAnimated:YES];

回答3:

Here is my code to go back to parent view controller

 - (IBAction)ActionbtnBack:(id)sender {
        int flag = 0;
        for (UIViewController *controller in [[self.navigationController.viewControllers reverseObjectEnumerator] allObjects]) {
            NSLog(@"> %@",[controller class]);
            if ([controller isKindOfClass:[YourParentviewcontroller class]]) {
                flag=1;
                [self.navigationController popToViewController:controller
                                                      animated:YES];
                break;
            }
            else if ([controller isKindOfClass:[YourParentviewcontroller class]]) {
                flag=1;
                [self.navigationController popToViewController:controller
                                                      animated:YES];
                break;
            }
        }
        if (flag == 0) {
            YourParentviewcontroller *MoreVc = [[YourParentviewcontroller alloc] initWithNibName:@"parentViewcontrollerIdentifier" bundle:nil];
            [self.navigationController pushViewController:MoreVc animated:YES];
        }
    }

回答4:

On Back button action, add this line:

[self.navigationController popToRootViewControllerAnimated:YES];

This will move you to rootViewController.