如何从json中获取图像和pdf文件并在tableviewcell swift 3中显示

Question

大家好，因为我是新生，所以不知道如何从 API 获取图像和 pdf 文件以及如何在 tableviewcell 中显示，以便用户可以看到图像和 pdf 文件以及从那里下载它。我尝试了一些代码图像，但它不工作，对 pdf 没有一个想法。请帮助。

图像代码： 我已经声明了一组图像，如下所示：

var announimage : Array = [UIImage]()

以下是我的 JSON 数据格式。

{
 "Download_Details": [
 {
"school_id": 1,
"class_id": "Pre - KG ",
"section": "A ",
"file_name": "427a3be0155b49db999cffb51f078f9c_431875732.pdf",
"title": "TeQ",
"message": "Hello Users",
"date": null
},
{
"school_id": 1,
"class_id": "Pre - KG ",
"section": "A ",
"file_name": "dce5ab53f45f4ec5b52894bc6286ed35_1376021.jpg",
"title": "Welcome",
"message": "Welcomes you.",
"date": null
},
{
 "school_id": 1,
 "class_id": "Pre - KG ",
 "section": "A ",
 "file_name": "9d3ff19bd54e48a087947227ee36c68c_13417773.png",
 "title": "TEST",
"message": "TEST",
"date": null
}
],
}

以下是我尝试过的代码：

let responseString = try! JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? NSDictionary

let downarray = responseString?.value(forKey: "Download_Details") as? NSArray

for down in downarray!
{
    let dowdict = down as? NSDictionary

    let dmsgname = dowdict?.value(forKey: "message")

    self.announmessage.append(dmsgname as! String)

   let downimage = dowdict?.value(forKey: "file_name")

   self.announimage.append(downimage as! UIImage)


}

DispatchQueue.main.async                                    
{
    self.annountable.reloadData()
}

UITableView 数据源：

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell2 = tableView.dequeueReusableCell(withIdentifier: "cell1", for: indexPath) as! AnnounceCellTableViewCell
    cell2.announlabel.text = announmessage[indexPath.row]
    cell2.announdate.text = announcedates[indexPath.row]
    let image :UIImage = UIImage(data:announimage[indexPath.row] as! Data)!
    cell2.dataimage.image = image       
     return cell2

}    

Answer 1

    let imgUrlStr:String = "https://dncache-mauganscorp.netdna-ssl.com/thumbseg/378/378006-bigthumbnail.jpg";

    if let imgURL = URL.init(string: imgUrlStr) {
        do {
            let imageData = try Data(contentsOf: imgURL as URL);
            let image = UIImage(data:imageData);
            print("here you will find your image:- \(String(describing: image)) ");
        } catch {
            print("Unable to load data: \(error)")
        }
    }

输出：--

here you will find your image:- Optional(<UIImage: 0x6080000bca40>, {450, 338})

在您的情况下，使用以下代码获取您的完整网址

    var prefixUrl = "http://apidomain.com/";
    let imageUrlStr = dowdict?.value(forKey: "file_name")

    prefixUrl.append(imageUrlStr);

    print("full url \(prefixUrl)");

FOR PDF -- 因为 pdf 不显示在 image view 中，所以需要在 webView 中显示。只需在 webView 中为 pdf 加载请求。

    let webView = UIWebView.init();
    let pdfUrlStr:String = "http://www.pdf995.com/samples/pdf.pdf";
    let pdfUrl = URL.init(string: pdfUrlStr);
    let urlRequest = URLRequest.init(url: pdfUrl!, cachePolicy: URLRequest.CachePolicy.reloadIgnoringLocalAndRemoteCacheData, timeoutInterval: 30.0);
    webView.loadRequest(urlRequest);

Answer 2

在行的单元格上尝试以下代码

let image : UIImage = UIImage(data: filteredAry[indexPath.row] as! Data)

cell2.dataimage.image = image