[英]CollectionViewCell Image does not fit in the cell while scrolling
嗨,大家好,
我有一个图像的collectionView。 水平滚动时,图像不适合单元格。 我在 iPhone 11 pro max 上运行它,宽度是 414。
我已启用分页。 我已经尝试过,方面适合,填充。 它没有多大帮助。 我想在滚动时使图像适合单元格
import UIKit
class ImageViewController:UIViewController,UICollectionViewDelegate, UICollectionViewDataSource {
let cellIdentifier = "SecondImageCell"
var images: [String] = ["1","2","3","4","5","6","7","8","9","10","11","12","13","14","15"]
var indexpath = NSString()
var startIndex = Int()
override func viewDidLoad() {
super.viewDidLoad()
indexpath = UserDefaults.standard.value(forKey: "indexPath") as! NSString
self.paging_ref.numberOfPages = images.count
}
@IBOutlet weak var paging_ref: UIPageControl!
@IBOutlet weak var secondCollectionView: UICollectionView!
override func viewDidLayoutSubviews()
{
super.viewDidLayoutSubviews()
let str = "\(indexpath)" // here i'm converting indexpath which is NSString into String
startIndex = Int(str)!
// here i'm converting str into integer value
startIndex -= 1
let indexPath = IndexPath(item: startIndex, section: 0)
self.secondCollectionView.isPagingEnabled = true
self.secondCollectionView.scrollToItem(at: indexPath, at: .centeredHorizontally, animated: true)
print(indexPath)
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return images.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellIdentifier, for: indexPath) as! SecondCollectionViewCell
cell.layer.shouldRasterize = true
cell.imageView2.image = UIImage(named: images[indexPath.row])
return cell
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
let pageIndex = round(scrollView.contentOffset.x/view.frame.width)
self.paging_ref.currentPage = Int(pageIndex)
}
}
我认为要么是您的约束已关闭,要么您的内容模式不是aspectFit
SecondCollectionViewCell: UICollectionViewCell {
...
// 1. make sure your image is constrained fully
// 2. imageView2.contentMode = .scaleAspectFit
...
}
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