Swift中要共享到Instagram故事的图像周围的水印/边框

import UIKit

func addWatermarkToImage(image: UIImage, watermarkText: String, borderColor: UIColor) -> UIImage? {
    // 创建一个图像上下文
    UIGraphicsBeginImageContextWithOptions(image.size, false, 0.0)
    
    // 在图像上下文中绘制原始图像
    image.draw(in: CGRect(x: 0, y: 0, width: image.size.width, height: image.size.height))
    
    // 绘制水印文本
    let textFontAttributes = [
        NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: 30),
        NSAttributedString.Key.foregroundColor: UIColor.white,
    ]
    let textSize = watermarkText.size(withAttributes: textFontAttributes)
    let textRect = CGRect(x: image.size.width - textSize.width - 10, y: image.size.height - textSize.height - 10, width: textSize.width, height: textSize.height)
    watermarkText.draw(in: textRect, withAttributes: textFontAttributes)
    
    // 绘制边框
    let borderWidth: CGFloat = 10
    let borderColor = borderColor.cgColor
    let borderRect = CGRect(x: borderWidth / 2, y: borderWidth / 2, width: image.size.width - borderWidth, height: image.size.height - borderWidth)
    let borderPath = UIBezierPath(rect: borderRect)
    borderPath.lineWidth = borderWidth
    borderColor.setStroke()
    borderPath.stroke()
    
    // 从图像上下文中获取最终图像
    let finalImage = UIGraphicsGetImageFromCurrentImageContext()
    
    // 结束图像上下文
    UIGraphicsEndImageContext()
    
    return finalImage
}

// 加载要共享的图像
let originalImage = UIImage(named: "image.jpg")!

// 添加水印/边框
let watermarkedImage = addWatermarkToImage(image: originalImage, watermarkText: "Watermark", borderColor: UIColor.red)

// 共享到Instagram故事
if let imageToShare = watermarkedImage {
    let activityViewController = UIActivityViewController(activityItems: [imageToShare], applicationActivities: nil)
    activityViewController.excludedActivityTypes = [UIActivity.ActivityType.addToReadingList, UIActivity.ActivityType.assignToContact]
    if let popoverController = activityViewController.popoverPresentationController {
        popoverController.sourceView = self.view
        popoverController.sourceRect = self.view.bounds
    }
    self.present(activityViewController, animated: true, completion: nil)
}