CODEWITHSUNDEEP
objective-cuinavigationbaruibarbuttonitemmodalviewcontroller
VonKoob
VonKoob

Reputation: 77

UINavigationBar, back button, and dismissModalViewController

I have an app that is navigation based, so all views default to have a top nav bar. I have reached a page where a back button is not displayed by default for whatever reason and I was required to add one programatically. Unfortunately, the back button does not dismiss the modal view as expected.

I load the view in question through:

-(IBAction) linkPress:(id)sender
{
    potentialUrl = [[NSURL alloc] initWithString:((Button*)sender).emailContent];

    webViewInst = [[WebView alloc] initWithNibName:@"WebView" bundle:nil url:potentialUrl];

    NSString *deviceType = [UIDevice currentDevice].model;
    if([deviceType isEqualToString:@"iPad"] || [deviceType isEqualToString:@"iPad Simulator"]){
        [self presentModalViewController:webViewInst animated:YES];
    }
    else {
        [self.navigationController pushViewController:webViewInst animated:YES];
    }    
}

I add the back button through:

UIBarButtonItem *MKbackBtn = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStylePlain target:self action:@selector(backButton:)]; 
[self.navigationItem setLeftBarButtonItem:MKbackBtn];

And the action that the back button should take to remove the view and return to the previous view:

-(IBAction)backButton:(id)sender
{
    UIViewController* parent = [self parentViewController];
    if(parent==nil) {
        parent = [self presentingViewController];
    }
    [parent dismissModalViewControllerAnimated:YES];
}

If another set of eyes could go over these bits of code and try to discern what mistake I have made, that would be greatly appreciated! I am more than willing to provide more information/code as well.

Thanks!

Upvotes: 0

Views: 390

Answers (2)

Alfie Hanssen
Alfie Hanssen

Reputation: 17104

You're calling dismissModalViewControllerAnimated but based on your code above there's a chance that it's not presented as modal and is instead pushed onto the navStack, in which case dismissModalViewControllerAnimated wouldn't actually dismiss it. Instead you would need to do popViewController etc. You should be casing around the presentation means. Can you confirm that this isn't part of the problem?

Also, off the top of my head I think you would call [self dismissModalViewController...] rather than parent.

Upvotes: 1

Nicholas Hart
Nicholas Hart

Reputation: 1724

Displaying a view controller modally does not include it in the navigation controller's stack. You have to provide your own UI mechanism to dismiss the modal view. It looks to me like your solution to dismiss the modal view controller should mostly work--although I think all you need is this one line in backButton::

[self dismissModalViewControllerAnimated:YES];

Upvotes: 0

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