在CALayer中添加圖像並居中

Question

我想將圖像居中放置在CALayer中。 即使圖像尺寸也必須相應地修改，並且圖像的顏色也應着色。 問題是我無法設置圖像大小，甚至無法添加顏色。

    //premium gradient
    let premiumViewLayer=CALayer()
    premiumViewLayer.bounds=CGRect(x:0, y:0, width:(getGradientWidth()), height:(LKView.bounds.height))
    premiumViewLayer.backgroundColor = UIColor.clear.cgColor

    let premiumimageViewLayer=CALayer()
    premiumimageViewLayer.frame = SSView.frame
    premiumimageViewLayer.contents=UIImage(named: "premium")?.cgImage
    premiumimageViewLayer.contentsGravity = kCAGravityCenter

    premiumViewLayer.addSublayer(premiumimageViewLayer)

我想實現以下目標：

Answer 1

試試這個它的工作:::

  let premiumViewLayer=CALayer()
    premiumViewLayer.frame = CGRect(origin: CGPoint.zero, size: imgView.frame.size)//CGRect(x:0, y:0, width:375, height:333.5)
    premiumViewLayer.backgroundColor = UIColor(white: 1.0, alpha: 0.5).cgColor
    premiumViewLayer.contents=UIImage(named: "premium")?.cgImage
    premiumViewLayer.contentsGravity = kCAGravityCenter
    view(on which on want to add this layer).layer.addSublayer(premiumViewLayer)