仅在swift 3中的whatsapp上共享图像

import UIKit

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    
    // 创建一个UIImagePickerController实例
    let imagePicker = UIImagePickerController()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置UIImagePickerController的代理为当前视图控制器
        imagePicker.delegate = self
    }
    
    // 打开相册
    func openPhotoLibrary() {
        imagePicker.sourceType = .photoLibrary
        present(imagePicker, animated: true, completion: nil)
    }
    
    // 打开相机
    func openCamera() {
        if UIImagePickerController.isSourceTypeAvailable(.camera) {
            imagePicker.sourceType = .camera
            present(imagePicker, animated: true, completion: nil)
        } else {
            // 相机不可用的处理逻辑
        }
    }
    
    // UIImagePickerControllerDelegate方法 - 用户选择了一张图片
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        // 获取选择的图片
        let selectedImage = info[.originalImage] as! UIImage
        
        // 在这里可以对图片进行处理或者上传到服务器
        
        // 关闭UIImagePickerController
        picker.dismiss(animated: true, completion: nil)
        
        // 调用WhatsApp的分享功能
        shareImageOnWhatsApp(image: selectedImage)
    }
    
    // 调用WhatsApp的分享功能
    func shareImageOnWhatsApp(image: UIImage) {
        let urlWhats = "whatsapp://app"
        if let urlString = urlWhats.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) {
            if let whatsappURL = URL(string: urlString) {
                if UIApplication.shared.canOpenURL(whatsappURL) {
                    if let imageData = image.jpegData(compressionQuality: 1.0) {
                        let tempFile = URL(fileURLWithPath: NSHomeDirectory()).appendingPathComponent("Documents/whatsAppTmp.wai")
                        do {
                            try imageData.write(to: tempFile, options: .atomic)
                            self.documentInteractionController = UIDocumentInteractionController(url: tempFile)
                            self.documentInteractionController.uti = "net.whatsapp.image"
                            self.documentInteractionController.presentOpenInMenu(from: CGRect.zero, in: self.view, animated: true)
                        } catch {
                            // 写入临时文件失败的处理逻辑
                        }
                    }
                } else {
                    // WhatsApp不可用的处理逻辑
                }
            }
        }
    }
}