139 lines
5.0 KiB
Swift
139 lines
5.0 KiB
Swift
import UIKit
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extension UIImage {
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func decodeImage(num: Int) -> UIImage {
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guard let decodedImage = decodeImage2(num: num) else {
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print("解密失败，返回原图")
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return self
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}
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// 将解密后的图片进行上下翻转
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// 2. 上下翻转图片
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//let flippedImage = decodedImage.flipVertically()
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// 3. 左右镜像图片
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let mirroredImage = decodedImage.wrongFlipHorizontally().correctFlipHorizontally()
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return mirroredImage
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}
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// 当前错误的水平翻转（保持原样）
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private func wrongFlipHorizontally() -> UIImage {
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UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
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defer { UIGraphicsEndImageContext() }
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guard let context = UIGraphicsGetCurrentContext(),
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let cgImage = self.cgImage else {
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print("镜像失败：无法获取 CGImage")
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return self
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}
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// 当前错误的翻转逻辑（实际会产生垂直翻转效果）
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context.translateBy(x: self.size.width, y: 0)
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context.scaleBy(x: -1.0, y: 1.0)
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context.draw(cgImage, in: CGRect(origin: .zero, size: self.size))
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return UIGraphicsGetImageFromCurrentImageContext() ?? self
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}
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// 新增：正确的水平翻转方法
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private func correctFlipHorizontally() -> UIImage {
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UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
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defer { UIGraphicsEndImageContext() }
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guard let context = UIGraphicsGetCurrentContext(),
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let cgImage = self.cgImage else {
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print("镜像失败：无法获取 CGImage")
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return self
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}
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// 正确的水平翻转逻辑
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context.translateBy(x: self.size.width, y: self.size.height)
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context.scaleBy(x: -1.0, y: -1.0) // 只翻转x轴
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context.draw(cgImage, in: CGRect(origin: .zero, size: self.size))
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return UIGraphicsGetImageFromCurrentImageContext() ?? self
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}
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// 解密图片逻辑（与之前一致）
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private func decodeImage2(num: Int) -> UIImage? {
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guard num > 0 else {
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print("解密跳过：num 参数为 0，直接返回原图")
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return self
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}
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let width = Int(self.size.width * self.scale)
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let height = Int(self.size.height * self.scale)
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let totalHeight = height // 总高度为整数
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let totalWidth = width
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UIGraphicsBeginImageContextWithOptions(CGSize(width: totalWidth, height: totalHeight), false, self.scale)
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defer { UIGraphicsEndImageContext() }
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guard let context = UIGraphicsGetCurrentContext(),
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let cgImage = self.cgImage else {
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print("解密失败：无法创建图形上下文或获取 CGImage")
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return nil
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}
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let segmentHeight = totalHeight / num // 每段高度
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let remainder = totalHeight % num // 余数
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print("图片总高度: \(totalHeight)，每段高度: \(segmentHeight)，余数: \(remainder)")
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for i in 0..<num {
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var currentSegmentHeight = segmentHeight
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let ySrc = segmentHeight * i // 从顶部开始裁剪
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var yDst = segmentHeight * i // 从顶部开始绘制
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if i == 0 {
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currentSegmentHeight += remainder // 第一段包含余数
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}
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let srcRect = CGRect(
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x: 0,
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y: CGFloat(ySrc),
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width: CGFloat(totalWidth),
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height: CGFloat(currentSegmentHeight)
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)
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let dstRect = CGRect(
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x: 0,
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y: CGFloat(yDst),
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width: CGFloat(totalWidth),
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height: CGFloat(currentSegmentHeight)
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)
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print("段 \(i): 源矩形: \(srcRect)，目标矩形: \(dstRect)")
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if let croppedImage = cgImage.cropping(to: srcRect) {
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context.draw(croppedImage, in: dstRect)
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} else {
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print("段 \(i): 裁剪失败")
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}
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}
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return UIGraphicsGetImageFromCurrentImageContext()
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}
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// 上下翻转图片逻辑
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private func flipVertically() -> UIImage {
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UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
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defer { UIGraphicsEndImageContext() }
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guard let context = UIGraphicsGetCurrentContext(),
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let cgImage = self.cgImage else {
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print("翻转失败：无法获取 CGImage")
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return self
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}
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// 翻转坐标系
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context.translateBy(x: 0, y: self.size.height)
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context.scaleBy(x: 1.0, y: -1.0)
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// 绘制翻转后的图片
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context.draw(cgImage, in: CGRect(origin: .zero, size: self.size))
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return UIGraphicsGetImageFromCurrentImageContext() ?? self
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}
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}
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