问题描述
我尝试使用与装饰项相同的 UICollectionReusableView 构建多个部分。但是当视图在滚动过程中被重用时,ReusableView 内部的gradientLayer 没有更新以满足新的部分大小。我不知道有什么问题。重用 UICollectionReusableView 时如何重置渐变层框架。
class RoundedBackgroundView: UICollectionReusableView {
private var insetView: UIView = {
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = false
view.layer.cornerRadius = 6
view.clipsToBounds = true
return view
}()
override init(frame: CGRect) {
super.init(frame: frame)
let gradientLayer = CAGradientLayer()
// Set the size of the layer to be equal to size of the display.
gradientLayer.frame = self.bounds
// Set an array of Core Graphics colors (.cgColor) to create the gradient.
gradientLayer.colors = [UIColor(red: 246,green: 186,blue: 58).cgColor,UIColor(red: 233,green: 115,blue: 58).cgColor]
gradientLayer.startPoint = CGPoint(x: 0.0,y: 0.5)
gradientLayer.endPoint = CGPoint(x: 1.0,y: 0.5)
// Rasterize this static layer to improve app performance.
gradientLayer.shouldRasterize = true
insetView.layer.addSublayer(gradientLayer)
addSubview(insetView)
NSLayoutConstraint.activate([
insetView.leadingAnchor.constraint(equalTo: leadingAnchor,constant: 0),insetView.trailingAnchor.constraint(equalTo: trailingAnchor,insetView.topAnchor.constraint(equalTo: topAnchor),insetView.bottomAnchor.constraint(equalTo: bottomAnchor)
])
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
解决方法
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