【问题标题】:Collection View/Tab Bar Controller Crashes集合视图/选项卡栏控制器崩溃
【发布时间】:2018-10-26 16:09:45
【问题描述】:

在我的应用程序中,我使用 Tab Bar 控制器在视图控制器之间切换,并且在每个视图控制器上我使用集合视图然后转到不同的页面。当我在计算机上运行该应用程序时,一切正常。问题是当我在手机上运行该应用程序时。每当我单击选项卡栏控制器中的选项卡时,该选项卡会转到带有集合视图控制器的页面,应用程序会冻结然后崩溃。我认为我已将问题缩小到集合视图控制器,因为当没有集合视图控制器时,我手机上的应用程序不会崩溃。它仅在使用集合视图控制器时崩溃。这可能是什么原因造成的?我看过,但没有发现任何类似的问题。

这是其中一个集合视图控制器的代码:

import UIKit
class HighSchoolController: UIViewController, \UICollectionViewDataSource, UICollectionViewDelegate {

    var identities = [String]()

    let hsImage: [UIImage] = [
        UIImage(named: "dates")!,
        UIImage(named: "athletics_icon")!,
        UIImage(named: "interm-1")!,
        UIImage(named: "lunch_icon")!,
        UIImage(named: "pioneerpress")!,
        UIImage(named: "PIONEERNEWS")!,
        UIImage(named: "clubs_icon")!,
        UIImage(named: "contact_icon")!
    ]

    override func viewDidLoad() {
        super.viewDidLoad()

        identities = ["events", "athletics", "da", "lunch", "pioneer press", "pioneer news", "clubs", "contact"]

        //Navigationbar Shadow
        self.navigationController?.navigationBar.layer.shadowColor = UIColor.black.cgColor
        self.navigationController?.navigationBar.layer.shadowOffset = CGSize(width: 0.0, height: 4.0)
        self.navigationController?.navigationBar.layer.shadowRadius = 9.0
        self.navigationController?.navigationBar.layer.shadowOpacity = 0.9
        self.navigationController?.navigationBar.layer.masksToBounds = false

        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return hsImage.count
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let hsCell = collectionView.dequeueReusableCell(withReuseIdentifier: "hsCell", for: indexPath) as! HighSchoolCell


        hsCell.hsImage.image = hsImage[indexPath.item]

        hsCell.layer.cornerRadius = (hsCell.layer.frame.height) / 2.0;
        hsCell.layer.masksToBounds = true

        return hsCell
    }

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

【问题讨论】:

  • 附上崩溃日志

标签: ios xcode uicollectionview uitabbarcontroller


【解决方案1】:

我通过在我的标签栏控制器中执行此操作解决了这个问题

  • 让 layout1 = UICollectionViewFlowLayout() 让 cv1 = CollectionView1(collectionViewLayout: layout1)

  • 让 layout2 = UICollectionViewFlowLayout() 让 cv2 = CollectionView1(collectionViewLayout: layout2)

  • 让 layout3 = UICollectionViewFlowLayout() 让 cv3 = CollectionView1(collectionViewLayout: layout3)

  • 让 layout4 = UICollectionViewFlowLayout() 让 cv4 = CollectionView1(collectionViewLayout: layout4)

【讨论】:

    【解决方案2】:

    在我看来,它一定在您的self.navigationController?... 行上崩溃了。我的猜测是您使用CollectionViewController 作为TabBarController 中选项卡的rootViewController

    如果要使用navigationController 在选项卡内导航,则需要附加navigationController 作为选项卡的根,然后将CollectionViewController 设置为navigationControllerrootViewController .

    您需要像TabBarController > NavigationViewController > CollectionViewController 这样的层次结构,而不是TabBarController > CollectionViewController 的层次结构

    【讨论】:

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