枣阳网站建设吧,seo入门课程,企业网站设计制作教程,郴州刚刚发生的事文章目录 1.瀑布流1.1 demo地址1.2 记得把部署的最低版本由8改成11,13甚至更高。不然编译会报错 2.动态计算图片和文字的高度 1.瀑布流
1.1 demo地址
CollectionViewWaterfallLayout - github 1.2 记得把部署的最低版本由8改成11,13甚至更高。不然编译会报错 2.动态计算图片和… 文章目录 1.瀑布流1.1 demo地址1.2 记得把部署的最低版本由8改成11,13甚至更高。不然编译会报错 2.动态计算图片和文字的高度 1.瀑布流
1.1 demo地址
CollectionViewWaterfallLayout - github 1.2 记得把部署的最低版本由8改成11,13甚至更高。不然编译会报错 2.动态计算图片和文字的高度
//可以正常使用
import UIKit
import SnapKit
class ConcernedVC: UICollectionViewController, UICollectionViewDelegateFlowLayout {let cellReuseIdentifier WaterfallCelllet itemsPerRow: CGFloat 2let sectionInsets UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)let itemSpacing: CGFloat 10 // Spacing between items in the same columnvar columnHeights: [CGFloat] [0, 0] // Heights of the two columnslet sampleData: [(image: UIImage, text: String)] [(UIImage(named: img_about us_app)!, Sample Text 1),(UIImage(named: banner)!, Sample Text 2adfahdfkajdfiahdofhadoifhaodhfaoihdfhasdifhaidhfapfdhiashf),(UIImage(named: img_about us_app)!, Sample Text 1),(UIImage(named: banner)!, Sample Text 2adfahdfkajdfiahdofhadoifhaodhfaoihdfhasdifhaidhfapfdhiashf),(UIImage(named: img_about us_app)!, Sample Text 1),(UIImage(named: banner)!, Sample Text 2adfahdfkajdfiahdofhadoifhaodhfaoihdfhasdifhaidhfapfdhiashf),(UIImage(named: img_about us_app)!, Sample Text 1),(UIImage(named: img_about us_app)!, Sample Text 1),// Add more sample data here]override func viewDidLoad() {super.viewDidLoad()// let layout UICollectionViewFlowLayout() // Create a layout instance
// collectionView UICollectionView(frame: .zero, collectionViewLayout: layout) // Initialize UICollectionView with the layoutcollectionView.delegate selfcollectionView.dataSource selfcollectionView.register(WaterfallCell.self, forCellWithReuseIdentifier: cellReuseIdentifier)collectionView.backgroundColor .white}// MARK: UICollectionViewDataSourceoverride func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) - Int {return sampleData.count}override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) - UICollectionViewCell {let cell collectionView.dequeueReusableCell(withReuseIdentifier: cellReuseIdentifier, for: indexPath) as! WaterfallCelllet data sampleData[indexPath.item]cell.configure(with: data)return cell}// MARK: UICollectionViewDelegateFlowLayoutfunc collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) - CGSize {let paddingSpace sectionInsets.left * (itemsPerRow 1)let availableWidth collectionView.frame.width - paddingSpacelet widthPerItem availableWidth / itemsPerRowlet data sampleData[indexPath.item]let imageAspectRatio data.image.size.width / data.image.size.heightlet textHeight data.text.height(withConstrainedWidth: widthPerItem - 16, font: UIFont.systemFont(ofSize: 14))let imageHeight min(200, widthPerItem / imageAspectRatio) // Limit image heightlet totalHeight imageHeight textHeight 16return CGSize(width: widthPerItem, height: totalHeight)}func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) - UIEdgeInsets {return sectionInsets}func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) - CGFloat {return sectionInsets.left}func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) - CGFloat {return sectionInsets.left}
}
class WaterfallCell: UICollectionViewCell {let imageView UIImageView()let label UILabel()override init(frame: CGRect) {super.init(frame: frame)contentView.backgroundColor .yellowcontentView.addSubview(imageView)imageView.contentMode .scaleAspectFillimageView.clipsToBounds truecontentView.addSubview(label)label.numberOfLines 2label.font UIFont.systemFont(ofSize: 14)}required init?(coder: NSCoder) {fatalError(init(coder:) has not been implemented)}func configure(with data: (image: UIImage, text: String)) {imageView.image data.imagelabel.text data.textlet imageAspectRatio data.image.size.width / data.image.size.heightlet imageHeight frame.width / imageAspectRatioimageView.frame CGRect(x: 0, y: 0, width: frame.width, height: imageHeight)label.frame CGRect(x: 0, y: imageHeight 8, width: frame.width, height: labelHeight)}private var labelHeight: CGFloat {let labelWidth frame.width - 16return label.text?.height(withConstrainedWidth: labelWidth, font: UIFont.systemFont(ofSize: 14)) ?? 0}
}
extension String {func height(withConstrainedWidth width: CGFloat, font: UIFont) - CGFloat {let constraintRect CGSize(width: width, height: .greatestFiniteMagnitude)let boundingBox self.boundingRect(with: constraintRect, options: .usesLineFragmentOrigin, attributes: [NSAttributedString.Key.font: font], context: nil)return ceil(boundingBox.height)}
}//使用
let layout UICollectionViewFlowLayout()
layout.scrollDirection .vertical
let vc ConcernedVC(collectionViewLayout: layout)
