在Swift上获取UIView和UIImageView的像素和点

// 获取UIView的像素和点
func getPixelsAndPoints(from view: UIView) -> (pixels: [UInt8], points: [CGPoint])? {
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, false, 0)
    guard let context = UIGraphicsGetCurrentContext() else {
        return nil
    }
    view.drawHierarchy(in: view.bounds, afterScreenUpdates: true)
    guard let cgImage = context.makeImage() else {
        return nil
    }
    let width = Int(view.bounds.size.width)
    let height = Int(view.bounds.size.height)
    let bytesPerPixel = 4
    let bytesPerRow = bytesPerPixel * width
    let bitsPerComponent = 8
    
    var pixels = [UInt8](repeating: 0, count: width * height * bytesPerPixel)
    let colorSpace = CGColorSpaceCreateDeviceRGB()
    let bitmapInfo = CGImageAlphaInfo.premultipliedLast.rawValue
    let context2 = CGContext(data: &pixels, width: width, height: height, bitsPerComponent: bitsPerComponent, bytesPerRow: bytesPerRow, space: colorSpace, bitmapInfo: bitmapInfo)
    
    context2?.draw(cgImage, in: CGRect(x: 0, y: 0, width: width, height: height))
    UIGraphicsEndImageContext()
    
    // 获取对应像素点的坐标
    var points = [CGPoint]()
    for y in 0..<height {
        for x in 0..<width {
            points.append(CGPoint(x: x, y: y))
        }
    }
    
    return (pixels, points)
}

// 获取UIImageView的像素和点
func getPixelsAndPoints(from imageView: UIImageView) -> (pixels: [UInt8], points: [CGPoint])? {
    guard let image = imageView.image else {
        return nil
    }
    let view = UIView(frame: CGRect(x: 0, y: 0, width: image.size.width, height: image.size.height))
    let subImageView = UIImageView(image: image)
    subImageView.frame = view.bounds
    view.addSubview(subImageView)
    
    return getPixelsAndPoints(from: view)
}

let view = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
view.backgroundColor = UIColor.red

if let (pixels, points) = getPixelsAndPoints(from: view) {
    // 对于UIView获取的像素和点的处理逻辑
    // pixels为像素数据，points为对应像素点的坐标
    // 在此处可以对像素数据进行处理，或者根据坐标进行特定操作
    print("Pixels: \(pixels)")
    print("Points: \(points)")
}

let imageView = UIImageView(image: UIImage(named: "example_image"))
if let (pixels, points) = getPixelsAndPoints(from: imageView) {
    // 对于UIImageView获取的像素和点的处理逻辑
    // pixels为像素数据，points为对应像素点的坐标
    // 在此处可以对像素数据进行处理，或者根据坐标进行特定操作
    print("Pixels: \(pixels)")
    print("Points: \(points)")
}