Unable to Navigate From UIViewController to UICollectionViewController

Question

I am working with UICollectionViewController. When I navigate from a UIViewController to a UICollectionViewController by using UINavigationController an exception occurred with message:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'UICollectionView must be initialized with a non-nil layout parameter.

I don't know why this happened.

I am using a simple UICollectionViewController without any coding (i.e. by default created file). Its file name is 'NewCollectionViewController.m' & 'NewCollectionViewController.h'.

My Xcode version is 6.1.1.

My navigation code is:

NewCollectionViewController *CVController = [[NewCollectionViewController alloc] init];
[self.navigationController pushViewController:CVController animated:YES];

I just want to navigate from UIViewController to UICollectionViewController.

Answer 1

I guess it's the first time you play with UICollectionViewController.

Just as the exception reason said UICollectionView must be initialized with a non-nil layout parameter. The proper init method of UICollectionViewController is

 - (instancetype)initWithCollectionViewLayout:(UICollectionViewLayout *)layout

Answer 2

Check The root View having NavigationController and make sure storyBoard Identifier set.

NewCollectionViewController *CVController = (NewCollectionViewController *)[self.storyboard instantiateViewControllerWithIdentifier:@"StoryBordIdentifier"]
[self.navigationController pushViewController:CVController animated:YES];

Push to new ViewController

Answer 3

you have to add [self.collectionView registerClass:[UICollectionView class] forCellWithReuseIdentifier:@"MyCell"];

in NewCollectionViewController class

Answer 4

Create UICollectionViewCell class and UICollectionViewFlowLayout class and add them to your UICollectionViewController class.