如何在滚动 Swift 时设置 UICollectionView 层不 moving/static

Question

我给UICollectionView添加了一个渐变层，但是这个层被设置为屏幕的宽度。我试图在滚动时保持图层静态但找不到解决方案。尝试设置为 collectionView 的框架和 currentVC，当我滚动图层时也在滚动。这是我到目前为止的代码，谢谢你的帮助。

let gradinatLayer = CAGradientLayer()
    gradinatLayer.frame = self.collectionView.frame //self.currentViewController.view.frame

    let cgColors:[CGColorRef] = [UIColor.blackColor().colorWithAlphaComponent(0.7).CGColor, UIColor.clearColor().CGColor, UIColor.blackColor().colorWithAlphaComponent(0.7).CGColor]

    gradinatLayer.colors = cgColors
    gradinatLayer.startPoint = CGPointMake(0, 0.5)
    gradinatLayer.endPoint = CGPointMake(1.0, 0.5)
    gradinatLayer.locations = [0.15, 0.50, 0.85]

    self.collectionView.layer.insertSublayer(gradinatLayer, atIndex: 0)

//This doesn't work
self.collectionView.layer.shouldRasterize = true
self.collectionView.layer.rasterizationScale = UIScreen.mainScreen().scale

Answer 1

尝试将图层添加到 collectionView 的背景视图：

self.collectionView.backgroundView.layer.addSublayer(gradinatLayer)

Answer 2

感谢您的所有评论。这是我深入研究 UIView 后的解决方案。不幸的是，将 super views 和 subviews 添加到 UICollectionView 仍然保持视图可滚动。感谢 John Stephen，他展示了如何使用 userIntaractions 及其子视图创建透明的 UIView，这成为可能。

我在 collectionView 之上声明了一个 @IBOutlet weak var passThroughView: PassThroughView!。

这是现在有效的代码：

let gradinatLayer = CAGradientLayer()
    gradinatLayer.frame = self.currentViewController.view.frame

    let cgColors:[CGColorRef] = [UIColor.blackColor().colorWithAlphaComponent(0.7).CGColor, UIColor.clearColor().CGColor, UIColor.blackColor().colorWithAlphaComponent(0.7).CGColor]

    gradinatLayer.colors = cgColors
    gradinatLayer.startPoint = CGPointMake(0, 0.5)
    gradinatLayer.endPoint = CGPointMake(1.0, 0.5)
    gradinatLayer.locations = [0.15, 0.50, 0.85]

    passThroughView.layer.insertSublayer(gradinatLayer, atIndex: 0)

如何在滚动 Swift 时设置 UICollectionView 层不 moving/static

How to set UICollectionView layer not moving/static while scrolling Swift

calayer

ios

cagradientlayer

uicollectionview

swift