How to launch a ViewController from a Non ViewController class?

Question

the title says it all, i usually open ViewControllers like this

ListingViewController *listingView = [[ListingViewController alloc]init];
[self.navigationCon         


        

Answer 1

The usual way is to implement the UICollectionViewDelegate method – collectionView:didSelectItemAtIndexPath: in the view controller that contains the UICollectionView. Then you can present the new view controller in the normal way.

For example:

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    [collectionView deselectItemAtIndexPath:indexPath animated:YES];

    MyModel * model = self.listItems[indexPath.row]; //retrieve the object that is displayed by the cell at the selected index

    MyViewerViewController * vc = [[MyViewerViewController alloc] initWithMyModel:model];
    [self.navigationController pushViewController:vc animated:YES];

}