集合视图/选项卡栏控制器崩溃

Question

在我的应用程序中，我使用选项卡栏控制器在视图控制器之间切换，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。当我在电脑上运行这个应用程序时，一切都很好。问题是当我在手机上运行该应用程序时。每当我点击选项卡栏控制器中的一个选项卡，该选项卡会转到带有集合视图控制器的页面，应用程序就会冻结，然后崩溃。我想我已经把问题缩小到了集合视图控制器，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。它只有在使用集合视图控制器时才会崩溃。是什么原因造成的？我看过，但没有发现任何类似的问题。

以下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)
}
}

Answer 1

我在我的选项卡控制器中这样做就明白了

• let layout1=UICollectionViewFlowLayout((let cv1=CollectionView1(collectionViewLayout:layout1(

• let layout2=UICollectionViewFlowLayout((let cv2=CollectionView1(collectionViewLayout:layout2(

• let layout3=UICollectionViewFlowLayout((let cv3=CollectionView1(collectionViewLayout:layout3(

• let layout4=UICollectionViewFlowLayout((let cv4=CollectionView1(collectionViewLayout:layout4(

Answer 2

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

如果要使用navigationController在选项卡中导航，则需要将navigationController附加为选项卡的根，然后将CollectionViewController设置为navigationController的rootViewController。

您需要一个类似TabBarController > NavigationViewController > CollectionViewController的层次结构，而不是TabBarController > CollectionViewController