如何使用 Swift 3 和 Alamofire 从 JSON 下载图像？

Question

如何使用 Alamofire 和 Swift 3 从 JSON 下载图像？我正在获取数据字典。请参阅以下 JSON 响应。我可以在标签中打印数据，但无法下载图像。这是我从 API 得到的响应。

userJson userJson userJson userJson ["status": 1, "student": { "admission_date" = "14/06/2017"; “admission_no” = 13538； "class_teacher" = "卡罗琳福布斯";出生日期 =
“2001 年 4 月 5 日”；电子邮件=“ranisagar.sivadas@gmail.com”； “父亲名字” = “萨加尔·西瓦达斯”；性别=男性；图片 =
"/system/images/86/j1f9DiJi_medium.jpg?1504593436"; “母亲姓名” = “拉尼RS”； name = "阿比吉特萨加尔";电话 = 9066260799；宗教= 印度教； "school_email" = "13538.861@demo.in"; “学生ID”= 86； },
“消息”：已成功获取详细信息。]

这是我的代码。

func SetUpUIProfiledata() {
    APIManager.sharedInstance.getParentDataFromURL(){(userJson)-> Void in
        let swiftyJsonVar = JSON(userJson)
        print("userJson userJson userJson userJson",userJson)
        print("swiftyJsonVar",swiftyJsonVar)
        let message = swiftyJsonVar["message"].rawString()
        let sudent = swiftyJsonVar["student"].rawString()!
        let jsonData = sudent.data(using: .utf8)!
        let dictionary = try? JSONSerialization.jsonObject(with: jsonData, options: []) as! Dictionary<String, Any>
        self.name_lbl.text = dictionary?["name"] as? String
        self.fatherName_lbl.text = dictionary?["father_name"] as? String
        self.motherName_lbl.text = dictionary?["mother_name"] as? String
        self.phone_lbl.text = dictionary?["phone"] as? String
        self.email_lbl.text = dictionary?["email"] as? String
        self.dob_lbl.text=dictionary?["dob"] as? String
        self.gender_lbl.text=dictionary?["gender"] as? String
        self.religion_lbl.text=dictionary?["religion"] as? String
        self.admissionDate_lbl.text=dictionary?["admission_date"] as? String
        self.admissionNum_lbl.text=dictionary?["admission_no"] as? String
        self.schoolMail_lbl.text=dictionary?["school_email"] as? String
        self.teacher_lbl.text=dictionary?["class_teacher"] as? String
    }
}

Answer 1

查看下面的代码，您只需将链接 url 传递给 alamofire 即可下载图像。如果它不是预期的答案，请重新编辑您的问题。

       let strURL1:String = "https://www.planwallpaper.com/static/images/9-credit-1.jpg"
Alamofire.request(strURL1).responseData(completionHandler: { response in
    debugPrint(response)

    debugPrint(response.result)

    if let image1 = response.result.value {
        let image = UIImage(data: image1)
         self.imageView.image = image

    }
})

我查看了你提供的输出结果

 image =
"/system/images/86/j1f9DiJi_medium.jpg?1504593436";

这是一个有效的 URL 或路径，如果它是一个 URL，你需要添加你的 base url + your " /system/images/86/j1f9DiJi_medium.jpg?1504593436" 并将它传递给 alamofire 块以下载图像 和我上面的例子一样

"https://www.planwallpaper.com" - baseURl
"static/images/9-credit-1.jpg" - image Path as in your case

希望对你有帮助。

Answer 2

首先获取图像键对应的值并将其与您的基本 URL 匹配。喜欢

let url = "www.yourbaseurlhere.com" + "/system/images/86/j1f9DiJi_medium.jpg?1504593436"

现在为它创建一个目标路径

let destination = DownloadRequest.suggestedDownloadDestination(
     for: .documentDirectory,
     in: .userDomainMask
 )

现在使用类似Alamofire的下载方法

Alamofire.download(url, to: destination)
     .downloadProgress { progress in
            print("Download Progress: \(progress.fractionCompleted)")
         }
         .responseData { response in
             if response.result.value != nil {
                   if let directoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0] as? URL {

                        let fileName = response.response?.suggestedFilename // get your file name here.
                        let finalPath = directoryURL.appendingPathComponent(fileName!) //get your file path here
                    }
              }
         }

希望对你有帮助。