Issue while remove viewController from navigation stack

Question

I am making demo in which I have to remove some of viewControllers from the NavigationController, and for that I have implemented below code but it give me issue.

I have pushed VC1,VC2,VC3 and now I want to push VC4 and remove VC2...

ViewController4 *VC4=[[ViewController4 alloc]initWithNibName:@"ViewController4" bundle:nil];
[self.navigationController pushViewController:VC4 animated:YES];

NSMutableArray *viewControllers = [NSMutableArray arrayWithArray:[[self navigationController] viewControllers]];

for(UIViewController *objVC in viewControllers)
{
    if([objVC isKindOfClass:[ViewController2 class]])
    {
        [viewControllers removeObjectIdenticalTo:objVC];
    }
}
self.navigationController.viewControllers =viewControllers ;

This code works fine with iOS8 but in iOS7 with VC2 also VC3 removes automatically when I press the back button in VC4. Even if I put below code the controller automatically removes from stack.

ViewController4 *VC4=[[ViewController4 alloc]initWithNibName:@"ViewController4" bundle:nil];
[self.navigationController pushViewController:VC4 animated:YES];

NSMutableArray *viewControllers = [NSMutableArray arrayWithArray:[[self navigationController] viewControllers]];

self.navigationController.viewControllers =viewControllers ;

Question 1: Do you want to remove VC2 when you are pushing VC4 or when you are coming back from VC4? — Burhanuddin Sunelwala
– Burhanuddin Sunelwala, Commented Mar 30, 2015 at 4:36
Question 2: When you come back from VC4, VC2 & VC3 are removed from the stack, am I right? — Burhanuddin Sunelwala
– Burhanuddin Sunelwala, Commented Mar 30, 2015 at 4:37
After you are pushing VC4, can you log all the view controllers in the navigation stack and check if VC4 there in the stack? — Burhanuddin Sunelwala
– Burhanuddin Sunelwala, Commented Mar 30, 2015 at 4:42
Ans1 : I want to remove VC2 after pushing the VC4. Ans2: Yes, when I press back from VC4 ,I am directly come to VC1 as I removed VC2 and VC3 removes automatically. Ans3: After pushing VC4 and removing VC2 I can get desired stack VC1,VC3,VC4 in NSLog. even in viewWillAppear of VC4 NSLog the same ,but in viewDidAppear of VC4 it prints VC1,VC4 only. — Vivek Shah
– Vivek Shah, Commented Mar 30, 2015 at 5:15
Thanks! Could also check my third comment, to log the view controllers before you perform removal operation — Burhanuddin Sunelwala
– Burhanuddin Sunelwala, Commented Mar 30, 2015 at 5:17

Tanuj · Accepted Answer · 2015-03-30 06:03:26Z

2

Here is the fix, working fine in iOS7 and iOS8:

NSMutableArray *viewControllers = [NSMutableArray arrayWithArray:[[self navigationController] viewControllers]];

    // Find the things to remove
        NSMutableArray *toDelete = [NSMutableArray array];

    for(UIViewController *objVC in viewControllers)
    {
        if([objVC isKindOfClass:[ViewController2 class]])
        {
            [toDelete addObject:objVC];
        }
    }
    [viewControllers removeObjectsInArray:toDelete];
    self.navigationController.viewControllers =viewControllers ;

ViewController4 *VC4=[[ViewController4 alloc]initWithNibName:@"ViewController4" bundle:nil];
[self.navigationController pushViewController:VC4 animated:YES];

edited Mar 30, 2015 at 6:03

answered Mar 27, 2015 at 10:56

Tanuj

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