Adding UICollectionViewLayout programmatically issue - ios

Question

I'm trying to implements this library without using storyBoard (first step for implementing this library) , because I'm creating my UIcollectionView programmatically.
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
//self.view.backgroundColor = [UIColor whiteColor];
[self.view addSubview:self.collectionView];
[_collectionView registerNib:[UINib nibWithNibName:#"myCell" bundle:nil] forCellWithReuseIdentifier:#"cell3"];
[_collectionView setBackgroundColor:[UIColor colorWithRed:0.945 green:0.945 blue:0.945 alpha:1] ];
[_collectionView setTransform:CGAffineTransformMakeScale(-1, 1)];
RFQuiltLayout* layout = (id)[_collectionView collectionViewLayout];
layout.direction = UICollectionViewScrollDirectionVertical;
layout.blockPixels = CGSizeMake(100, 100);
}
- (UICollectionView *)collectionView {
if (!_collectionView) {
CGRect collectionViewFrame = self.view.bounds;
collectionViewFrame.size.height -= (self.navigationController.viewControllers.count > 1 ? 0 : (CGRectGetHeight(self.tabBarController.tabBar.bounds))) + 0;
// FMMosaicLayout *mosaicLayout = [[FMMosaicLayout alloc] init];
//// _collectionView = [[UICollectionView alloc] initWithFrame:collectionViewFrame collectionViewLayout:mosaicLayout];
// RFQuiltLayout* layout = (id)[_collectionView collectionViewLayout];
// layout.direction = UICollectionViewScrollDirectionVertical;
// layout.blockPixels = CGSizeMake(100, 100);
_collectionView = [[UICollectionView alloc] initWithFrame:collectionViewFrame collectionViewLayout:[[RFQuiltLayout alloc] init]];
_collectionView.delegate = self;
_collectionView.dataSource = self;
}
return _collectionView;
}
But this didn't worked and nothing is shown in my view (no error and empty view that's all) Also using debugger I've notified that the UICollectionView Method are never called

Answer 1

First of all, your collectionView method is not called because you are using _collectionView instead self.collectionView in your viewDidLoad method. You need to write self for every property to call their setter and getter methods.
Second, if you want to add custom layout without Storyboard of XIB, then you need to set it programmatically:
RFQuiltLayout* layout = [[RFQuiltLayout alloc] init];
layout.direction = UICollectionViewScrollDirectionVertical;
layout.blockPixels = CGSizeMake(100, 100);
self.collectionView.collectionViewLayout = layout;