CODEWITHSUNDEEP
objective-cuinavigationcontrollerxcode5xcode-storyboard
tombornal
tombornal

Reputation: 65

Navigation controller sometimes pushes to black screen using storyboard

I'm using storyboard in Xcode 5 and I'm trying to push to a UIViewController from a UITableViewController that's housed in a UINavigationController, but I sometimes get a black screen (probably 75% of the time). From reading other posts, I've learned to use the instantiateViewControllerWithIdentifier: method to instantiate the view controller I'm pushing to prior to pushing, so my code looks like this:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    if (indexPath.row < self.objects.count) {
        PFObject *retrievedProduct = [self.objects objectAtIndex:indexPath.row];
        Product *product = [[Product alloc] init];

        // set properties for retrieved product 
        // (code omitted)

        //load product detail page
        self.detailPage = [[UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]] instantiateViewControllerWithIdentifier:@"MPDetailPageViewController"];
        self.detailPage.product = product;

        //Bring to detail page
        [self.navigationController pushViewController:self.detailPage animated:YES];

    } else if (self.paginationEnabled) {
        // load more
        [self loadNextPage];
    }
}

And in MPDetailPageViewController I do an NSLog in viewDidAppear and even when the screen is black, it is still printing.

Any advice would be greatly appreciated.

Thanks, Tim

Upvotes: 1

Views: 2179

Answers (1)

meda
meda

Reputation: 45500

see if this works for you:

first make sure the header file is imported:

#import "MPDetailPageViewController.h"

then do this:

//the storyboard
UIStoryboard *storyboard = self.navigationController.storyboard;

//the detail controller
MPDetailPageViewController *detailPage = [storyboard 
           instantiateViewControllerWithIdentifier:@"MPDetailPageViewController"];
//set the product
detailPage.product = product;
//Push to detail View
[self.navigationController pushViewController:detailPage animated:YES];

PROJECT NO SEGUE

Unless you really have to, it is more difficult (more code) to push views programmatically.

Just create a segue in storyboard please refer to one of my answers if your not sure.

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    //[tableView deselectRowAtIndexPath:indexPath animated:YES];
    if (indexPath.row < self.objects.count) {
        //perform the segue
        [self performSegueWithIdentifier:@"detailSegue" sender:sender];
    } else if (self.paginationEnabled) {
        // load more
        [self loadNextPage];
    }
}

Now you can move all that other code to the following segue deleguate:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Make sure your segue name in storyboard is the same as this line
 if([segue.identifier isEqualToString:@"detailSegue"]){
    NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
    PFObject *retrievedProduct = [self.objects objectAtIndex:indexPath.row];
    Product *product = [[Product alloc] init];

    MPDetailPageViewController *detailVC = (MPDetailPageViewController *)segue.destinationViewController;
    detailVC.product = product;
 }
}

PROJECT USING SEGUE

Upvotes: 2

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