Question

我在一个UIViewController中有两个单独的UICollectionViews。每个UICollectionView都从两个不同的数组中提取数据并正确显示它们。但是，我无法单击UICollectionViewCell来执行对另一个UIViewController的设置。

我认为它与if-else语句有关，因为我收到一条错误消息，指出“将永远不会执行。”

我尝试将“ didSelectItem indexPath”代码移至if-else语句之前和之后的不同部分。

导入UIKit

HomeViewController类：UIViewController，UICollectionViewDataSource，UICollectionViewDelegate {

@IBOutlet weak var categoriesCollectionView: UICollectionView!

@IBOutlet weak var popularCollectionView: UICollectionView!

let categories = [

    "Browse All Categories",
    "cat1",
    "cat2",
    "cat3",

    ]

let categoryImages: [UIImage] = [

    UIImage(named: "img1")!,
    UIImage(named: "img2")!,
    UIImage(named: "img2")!,

]

let browsePopular = [

    "pop1",
    "pop2",
    "pop3",

]

let popularImage: [UIImage] = [

    UIImage(named: "popImg1")!,
    UIImage(named: "popImg2")!,
    UIImage(named: "popImg3")!,

]

let browsePopularDescription = [

    "popDesc1",
    "popDesc2",
    "popDesc3"

]



override func viewDidLoad() {
    super.viewDidLoad()


    categoriesCollectionView.delegate = self
    categoriesCollectionView.dataSource = self

    popularCollectionView.delegate = self
    popularCollectionView.dataSource = self

///我尝试在开始时移动didSelect代码：

    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        let name = categories[indexPath.row]
        let viewController = storyboard?.instantiateViewController(withIdentifier: name)
        self.navigationController?.pushViewController(viewController!,  animated: true)

    }
}



override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}

///开始分类收集查看代码

func numberOfSections(in collectionView: UICollectionView) -> Int {
    return 1
}

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    if collectionView==self.categoriesCollectionView{
        return categories.count

    }
    else{
        return browsePopular.count
    }
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

    if collectionView==self.categoriesCollectionView {


    let cell: CategoriesCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellBrowseAll", for: indexPath) as! CategoriesCollectionViewCell

    cell.categoriesCollectionViewImage.image = categoryImages[indexPath.item]


    return cell
    }

    else{

        let cell: PopularCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellPop1", for: indexPath) as! PopularCollectionViewCell

        cell.browsePopular.text = browsePopular[indexPath.row]
        cell.popularImage.image = popularImage[indexPath.row]
        cell.browsePopularDescription.text = browsePopularDescription[indexPath.row]

        return cell


    }

///我尝试在末尾添加didSelect代码，但收到一条警告消息，内容为：“将永远不会执行”

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
       let name = categories[indexPath.row]
       let viewController = storyboard?.instantiateViewController(withIdentifier: name)
    self.navigationController?.pushViewController(viewController!,  animated: true)
   }

}

预期结果-用户单击UICollectionViewCell并使用

选择到新的UIViewController

实际结果-无法识别点击或代码未执行

无法单击CollectionViewCell来隔离到新的ViewController

0 个答案: