從應用程序Swift上傳圖像文件

Question

我正在嘗試將圖像文件上傳到我的服務器。 下面的屏幕顯示通過郵遞員的呼叫。

在表單數據主體中使用KEY： “ image”和Value： 123.png [image file] 。

我想使用swift在我的應用程序中實現相同的功能。 我嘗試了其他解決方案，但沒有找到合適的解決方案。

我正在UIImagePicker的幫助下選擇圖像：

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) 
            {
                let image = info[UIImagePickerControllerOriginalImage] as? UIImage
                self.dismiss(animated: true, completion: nil)
                uploadImage(image: image!, url: "profile_image/")
            }

我調用uploadImage函數上傳圖像。

func uploadImage(image: UIImage, url: String) {
        let urlString = "http://example.com/path/"+url
        guard let url = URL(string: urlString) else { return }
        let request = NSMutableURLRequest(url: url)
        request.httpMethod = "POST"
        let token = UserDefaults.standard.object(forKey: "token") as? String
        request.addValue("Token "+token!, forHTTPHeaderField: "Authorization")
        let imageData = UIImagePNGRepresentation(image)!.base64EncodedData()
        //let postString = "image=\(imageData))"
        //request.httpBody = postString.data(using: .utf8)

    let imgDict = ["image": imageData]

    do {
        let jsonBody = try JSONEncoder().encode(imgDict)
        print(jsonBody)
        request.httpBody = jsonBody
    } catch let jsonError {
        print(" Parsing Error: "+jsonError.localizedDescription)
    }

        URLSession.shared.dataTask(with: request as URLRequest) { (data, response, error) in
            if error != nil {
                print("Image upload API Error: "+error!.localizedDescription)
            }
            guard let data = data else { return }
            do {
                print(data)
                let responseData = try JSONDecoder().decode(BasicResponseParameter.self, from: data)
                print(responseData)

                if responseData.success {
                    print("Image uploaded")
                }
                else {
                    print("Image upload API Failed : "+responseData.message!)
                    DispatchQueue.main.async(execute: {
                        popAlert(title: "FAILED", message: responseData.message!, owner:self)
                    })
                }
            } catch let jsonError {
                print("Image upload API JSON Error :"+jsonError.localizedDescription)
            }
            }.resume()
    }

任何幫助表示贊賞。

Answer 1

我建議您對圖像進行編碼（在將圖像發送到服務器時），然后將圖像解碼（在向后查詢圖像時）成base64格式

編碼

let img = /// this is your image 
let encodedString =   UIImagePNGRepresentation(img)?.base64EncodedString() 

解碼：

let data_from_response = /// from your response 
let decodeData = Data(base64Encoded: data_from)

由於您是通過請求正文發送dictionary ，因此您需要將dictionary轉換為json

guard let imgDataString = String.init(data: encodedString, encoding: String.Encoding.utf8) else { return } 

let imgDict = ["image": imgDataString ] 

let jsonData = try! JSONSerialization.data(withJSONObject: imgDict, options: .prettyPrinted)

request.httpBody = jsonData 

旁注避免implicit optional unwrapping義! ，可以if let或guard語句中使用