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我在使用 CIFilter 将两个图像组合在一起时遇到了问题。这里出了什么问题？
下面的代码创建了一个 UIImageView 并将其添加到 View 中，然后将两个图像 imageA 和 imageB 与 CIFilter 组合在一起，并将合成输出到 UIImageView。
但是，合并后的图像没有显示在 UIImageView 中，它仍然是空白。
Questions:
- What is the correct code to display the composite image into the
UIImageView?- Is there more performant way in which to combine two images with
CIFilter?
代码:
let imageView = UIImageView()
imageView.frame = CGRect(x: 0, y: 0, width: view.bounds.width, height: view.bounds.height)
imageView.contentMode = .Center
view.addSubview(imageView)
let imageA = CIImage(image: UIImage(named:"imageA")!)
let imageB = CIImage(image: UIImage(named:"imageB")!)
let imageFilter = CIFilter(name: "CIAdditionCompositing")!
imageFilter.setValue(imageA, forKey: kCIInputImageKey)
imageFilter.setValue(imageB, forKey: kCIInputBackgroundImageKey)
if let imageCombined = imageFilter.outputImage {
let image = UIImage(CIImage: imageCombined)
imageView.image = image
}