Unexpectedly found nil while unwrapping an Optional value collectionview

Question

I have a photo view app which which I use Alamofire to get the data and use RxSwift to observer changes in the API. everything works well and I can print the total number of returned items and even print individual items but the app crashes when ever I set my UIlabel text to the title value got from the code. I do not know why this is any help would be appreciated.

the crash is Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value

Main cell

func configueCell(flickerPhotoModel: FlickrPhotoModel) -> Void {

        self.layer.backgroundColor = UIColor.lightGray.cgColor
        print("Cell \(String(describing: flickerPhotoModel.id))")
        flikrTitle.text = flickerPhotoModel.title
    }

PhotoViewModel

private func setupPageBinding() {
        currentState.asObservable()

            .subscribe(onNext: { currentState in
            if currentState == .initialLoading || currentState == .loadingNextPage {
                self.fetchNextPageOfPhotos()
            }
        }).disposed(by: disposeBag)
        photos.asObservable()
            .map { $0.count > 0 ? self.currentPage.value + 1 : self.currentPage.value }
            .bind(to: currentPage)
            .disposed(by: disposeBag)
    }

COntroller

private func setupCollectionViewBinding() {
        print("JSONNN x \(self.viewModel.photos.value.count)")
        viewModel.photos
            .asObservable()
            .bind(to: collectionView.rx.items(cellIdentifier: reuseIdentifier, cellType: MainCell.self))
            { _, photo, cell in
                cell.configueCell(flickerPhotoModel: photo)
                print("JSONNN 5 \(self.viewModel.photos.value.count)")
            }
            .disposed(by: disposeBag)
        viewModel.currentState
            .asObservable()
            .map { $0 == .initialLoading || $0 == .initialLoadingFailure }
            .bind(to: collectionView.rx.isHidden)
            .disposed(by: disposeBag)
        collectionView.rx.modelSelected(FlickrPhotoModel.self)
            .subscribe(onNext: {
                self.routingDelegate?.handlePhotoSelection($0)
            })
            .disposed(by: disposeBag)
    }

I registered it in the viewController like this `collectionView.register(MainCell.self, forCellWithReuseIdentifier: reuseIdentifier)` — King, Nov 20 '18 at 10:59
Check your flikrTitle label and flickerPhotoModel.title, One of them should be nil. — Natarajan, Nov 20 '18 at 11:01
yes, that's what I was after; based on how you create your cell (storyboard, nib) is to check if you have linked the reference/IBOutlet to the `flikrTitle` UILabel — Peter Pajchl, Nov 20 '18 at 11:02
Are you getting your `flickerPhotoModel.title` correctly from server? — iPeter, Nov 20 '18 at 11:06
print("Cell label:\\(flikrTitle) flickerPhotoModel.title:\\(String(describing: flickerPhotoModel.title))") and check which one is nil. If both has value, then your issue is in different place. — Natarajan, Nov 20 '18 at 11:09
printing this `print("JSONNN label\(String(describing: cell.flikrTitle.text)))")` crashes the app — King, Nov 20 '18 at 11:18

score 0 · Answer 1 · answered Nov 20 '18 at 13:54

0

Check for UILabel, it may not be having connection in Interface Builder/StoryBoard.

answered Nov 20 '18 at 13:54

Muhammad Waqas

904
2
10
21

Unexpectedly found nil while unwrapping an Optional value collectionview

1 Answers1