如何在UIImageView中更改单个像素的图像

// 获取UIImageView中的原始图像
let originalImage = imageView.image

// 将图像转换为可编辑的格式
let cgImage = originalImage?.cgImage

// 创建可编辑的图像上下文
let colorSpace = CGColorSpaceCreateDeviceRGB()
let bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.premultipliedLast.rawValue)
let context = CGContext(data: nil, width: cgImage!.width, height: cgImage!.height, bitsPerComponent: 8, bytesPerRow: 0, space: colorSpace, bitmapInfo: bitmapInfo.rawValue)!

// 修改像素值
let rect = CGRect(x: 0, y: 0, width: cgImage!.width, height: cgImage!.height)
context.draw(cgImage!, in: rect)

// 获取像素数据
let data = context.data
let dataType = UnsafeMutablePointer<UInt8>.self

// 修改单个像素的颜色值
let pixelIndex = (x: 10, y: 10) // 要修改的像素位置
let offset = 4 * (pixelIndex.y * cgImage!.width + pixelIndex.x) // 计算像素在数据中的偏移量
data?.advanced(by: offset).assumingMemoryBound(to: dataType).pointee = 255 // 修改像素的颜色值

// 生成新的图像
let newCGImage = context.makeImage()!
let newImage = UIImage(cgImage: newCGImage)

// 将新的图像设置回UIImageView
imageView.image = newImage