如何以编程方式在iOS设备中为求救截图？

func takeScreenshot() -> UIImage? {
    UIGraphicsBeginImageContextWithOptions(UIScreen.main.bounds.size, false, 0)
    guard let context = UIGraphicsGetCurrentContext() else { return nil }
    UIApplication.shared.keyWindow?.layer.render(in: context)
    let screenshot = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return screenshot
}

func saveScreenshotToPhotoLibrary(_ screenshot: UIImage) {
    PHPhotoLibrary.shared().performChanges({
        PHAssetChangeRequest.creationRequestForAsset(from: screenshot)
    }, completionHandler: { success, error in
        if success {
            print("Screenshot saved to photo library")
        } else if let error = error {
            print("Error saving screenshot: \(error.localizedDescription)")
        }
    })
}

func triggerSOS() {
    if let screenshot = takeScreenshot() {
        saveScreenshotToPhotoLibrary(screenshot)
        // 其他求救逻辑...
    }
}