屏幕重新加载时 CollectionView 单元格更改大小

Posted 2023-03-16

【中文标题】屏幕重新加载时 CollectionView 单元格更改大小

【英文标题】：CollectionView Cell Changing Size when screen reloads

【发布时间】：2020-12-05 16:36:06

【问题描述】：

我正在创建一个屏幕，用户可以在其中搜索电影并将结果加载到集合视图中，一切都完美加载，但在模拟器中，当我单击“命令、Shift、A”以更改为灯光模式以确保颜色会正确适应单元格随机更改大小为全屏而不是我设置的大小。

当我离开应用程序进入主页然后单击返回应用程序时也会发生这种情况。我正在以编程方式创建所有内容，因此请以这种方式回答。

以下是我的自定义单元格中的代码：

import UIKit

class FavouritesCell: UICollectionViewCell 
    static let identifier = "FavouritesCell"

    let movieTitle: UILabel = 
        let label = UILabel()
        label.translatesAutoresizingMaskIntoConstraints = false
        label.lineBreakMode = .byWordWrapping
        label.textColor = .secondaryLabel
        //label.text = "Title"
        label.adjustsFontSizeToFitWidth = true
        label.textAlignment = .center
        label.font = label.font.withSize(12)
        label.minimumScaleFactor = 0.75
        return label 
    ()

    let image : UIImageView = 
        let image = UIImageView()
        image.clipsToBounds = true
        image.translatesAutoresizingMaskIntoConstraints = false
        //image.backgroundColor = .yellow
        image.layer.cornerRadius = 10.0
        return image
    ()

    let cancelItem : UILabel = 
        let label = UILabel()
        label.layer.borderWidth = 2.0
        label.layer.borderColor = UIColor.systemGray.cgColor
        label.text = "X"
        label.textAlignment = .center
        label.layer.cornerRadius = 15
        //label.isHidden = true
        return label
    ()

    override init(frame: CGRect) 
        super.init(frame: .zero)
    
        contentView.addSubview(image)
        contentView.addSubview(movieTitle)
        contentView.addSubview(cancelItem)
    

    required init?(coder: NSCoder) 
        fatalError("init(coder:) has not been implemented")
    

    override func layoutSubviews() 
        super.layoutSubviews()
        image.frame = CGRect(x: 0, y: 25, width: contentView.width, height: contentView.height - 30 )
        movieTitle.frame = CGRect(x: 0, y: 0, width: contentView.width, height: 25)
        cancelItem.frame = CGRect(x: image.right - 25, y: image.top , width: 25, height: 25)
    

这是视图控制器中与 collectionView 相关的代码：

private let collectionView: UICollectionView = 
    let layout = UICollectionViewFlowLayout()
    layout.scrollDirection = .vertical
    layout.minimumLineSpacing = 2
    layout.minimumInteritemSpacing = 2
    let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
    collectionView.translatesAutoresizingMaskIntoConstraints = false
    collectionView.register(FavouritesCell.self, forCellWithReuseIdentifier: FavouritesCell.identifier)
    collectionView.clipsToBounds = true
    collectionView.backgroundColor = UIColor.systemBackground
    
    return collectionView
()
    NSLayoutConstraint.activate([
        searchText.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
        searchText.heightAnchor.constraint(equalToConstant: 50),
        searchText.leadingAnchor.constraint(equalTo: view.leadingAnchor),
        searchText.trailingAnchor.constraint(equalTo: view.trailingAnchor),
        
        collectionView.topAnchor.constraint(equalTo: searchText.bottomAnchor),
        collectionView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
        collectionView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
        collectionView.trailingAnchor.constraint(equalTo: view.trailingAnchor)
    ])



func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize 
    return CGSize(width: (view.width / 3) - 4, height: (view.width / 2) - 2 )

image of CollectionView working normally

After the screen has been reloaded

【问题讨论】：

是否有图片显示问题？

我添加了前后截图来帮助

【参考方案1】：

尝试给你的 imageView 一个固定的高度和固定的宽度，然后再试一次，它会起作用