,可以通过以下步骤实现:
以下是一个示例代码,用于在视图控制器演示期间制作collectionView布局动画:
import UIKit
class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
private let reuseIdentifier = "Cell"
private var collectionView: UICollectionView!
private var data = [Int]()
override func viewDidLoad() {
super.viewDidLoad()
// 创建UICollectionViewFlowLayout实例
let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .vertical
layout.minimumInteritemSpacing = 10
layout.minimumLineSpacing = 10
// 创建UICollectionView实例
collectionView = UICollectionView(frame: view.bounds, collectionViewLayout: layout)
collectionView.dataSource = self
collectionView.delegate = self
collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: reuseIdentifier)
collectionView.backgroundColor = .white
view.addSubview(collectionView)
// 添加一些示例数据
for i in 0..<10 {
data.append(i)
}
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
// 刷新collectionView数据
collectionView.reloadData()
// 执行布局动画
animateCollectionView()
}
func animateCollectionView() {
let cells = collectionView.visibleCells
let collectionViewHeight = collectionView.bounds.size.height
for (index, cell) in cells.enumerated() {
cell.transform = CGAffineTransform(translationX: 0, y: collectionViewHeight)
cell.alpha = 0
UIView.animate(withDuration: 0.5, delay: 0.1 * Double(index), options: .curveEaseInOut, animations: {
cell.transform = CGAffineTransform.identity
cell.alpha = 1
}, completion: nil)
}
}
// MARK: - UICollectionViewDataSource
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return data.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath)
cell.backgroundColor = .blue
return cell
}
// MARK: - UICollectionViewDelegateFlowLayout
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: 100, height: 100)
}
}
这个示例代码创建了一个简单的UICollectionView,并在视图控制器的viewDidAppear方法中执行布局动画。在布局动画中,每个item从底部滑入并逐渐显示出来。你可以根据需要自定义动画效果,例如改变item的大小、透明度等。
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