uiscrollview在iPad上水平滚动时会拉扯

Question

我正在使用swift3我的应用包含用于水平滚动的UIscrollview。它包含带分页的图像。下面是它的代码示例。

for index in 0..<storyImages.count { 
       frame.origin.x = self.scrollView.frame.size.width * CGFloat(index)
       frame.size = self.scrollView.frame.size
       self.scrollView.isPagingEnabled = true
        print(self.scrollView.bounds.width * CGFloat(index))
      let rect = CGRect(x: CGFloat(self.scrollView.bounds.width * CGFloat(index)), y: 0, width: scrollViewWidth , height: scrollViewHeight)
      let imageView = UIImageView()
        imageView.frame = rect
      imageView.image = storyImages[index]
     self.scrollView.addSubview(imageView)           
  }

它可以在所有iPhone上完美运行，但在iPad上执行相同的应用程序水平滚动是滞后的。请指教

Answer 1

为此目的使用UICollectionView要好得多。

将滚动方向设置为水平，并为集合视图启用分页。 和Min间距

extension FirstViewController: UICollectionViewDataSource {

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath)
        cell.backgroundColor = indexPath.row % 2 == 0 ? #colorLiteral(red: 1, green: 0.3126001954, blue: 1, alpha: 1) : #colorLiteral(red: 0.1411764771, green: 0.3960784376, blue: 0.5647059083, alpha: 1)
        return cell
    }

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 5
    }

}

extension FirstViewController: UICollectionViewDelegateFlowLayout {

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return collectionView.frame.size
    }

}

Answer 2

你必须关闭scrollview的滞后。

self.scrollView.isPagingEnabled = false