如何从json获取图像和pdf文件并在tableviewcell swift 3中显示 [英] How to fetch image and pdf file from json and display in tableviewcell swift 3

问题描述

大家好，我是应届生，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，以便用户可以查看图像和pdf文件以及从那里下载.我尝试了一些代码图片，但无法正常工作，并且对pdf没有任何想法.请帮忙.

Hello all as i am a Fresher so dont know how to fetch image and pdf file from API and how to display in tableviewcell so that user can see the image and pdf file as well download it from there.I tried some code for image but its not working and dont have a single idea for pdf.Please help.

图像代码: 我已经声明了一个图像数组，如下所示:

code for image : I have declared an array of images like below :

var announimage : Array = [UIImage]()

下面是我的JSON数据的格式.

{
 "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

}    

推荐答案

    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})

您可以使用以下代码获取完整的网址

In your case get your full url by using following piece of code

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

    prefixUrl.append(imageUrlStr);

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

用于PDF -由于pdf不在图像视图中显示，因此您需要在webView中显示它.只需在webView中将请求加载为pdf.

FOR PDF -- as pdf does not display in image view, so you need to display it in webView. Just load request in webView for pdf.

    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);

这篇关于如何从json获取图像和pdf文件并在tableviewcell swift 3中显示的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！