为CIFilter CIPerspectiveCorrection设置动画

import UIKit
import CoreImage

class ViewController: UIViewController {
    @IBOutlet weak var imageView: UIImageView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建CIFilter对象
        let filter = CIFilter(name: "CIPerspectiveCorrection")
        
        // 设置滤镜参数
        filter?.setValue(CIVector(x: 0, y: 0), forKey: "inputTopLeft")
        filter?.setValue(CIVector(x: 100, y: 0), forKey: "inputTopRight")
        filter?.setValue(CIVector(x: 0, y: 100), forKey: "inputBottomLeft")
        filter?.setValue(CIVector(x: 100, y: 100), forKey: "inputBottomRight")
        
        // 创建CATransition对象
        let transition = CATransition()
        transition.duration = 1.0 // 动画持续时间
        transition.type = .fade // 过渡效果为淡入淡出
        
        // 将CATransition对象添加到imageView的layer上
        imageView.layer.add(transition, forKey: nil)
        
        // 应用滤镜效果并更新imageView的图像
        imageView.image = applyFilter(filter: filter)
    }
    
    func applyFilter(filter: CIFilter?) -> UIImage? {
        guard let filter = filter else {
            return nil
        }
        
        // 获取输入图像
        guard let inputImage = CIImage(image: imageView.image!) else {
            return nil
        }
        
        // 设置滤镜的输入图像
        filter.setValue(inputImage, forKey: kCIInputImageKey)
        
        // 获取滤镜输出图像
        guard let outputImage = filter.outputImage else {
            return nil
        }
        
        // 创建CIContext对象
        let context = CIContext(options: nil)
        
        // 将输出图像渲染到CGImage上
        guard let cgImage = context.createCGImage(outputImage, from: outputImage.extent) else {
            return nil
        }
        
        // 创建UIImage对象
        let filteredImage = UIImage(cgImage: cgImage)
        
        return filteredImage
    }
}