如何在Swift中显示来自URL的图像

Question

我正在进行异步调用，JSON响应同时包含文本和图像的URL。我想在UIImageView中显示这些图像。现在，将文本显示在标签中不是问题，但是加载图像让我感到困难。下面是我的代码。

//Declared variables to hold response
    var offerContent: String?
    var offerImage: URL?
    var offerTitle: String?
    var suggestionLabel:String?
    var suggestionScreen: String?



//create a task to send reques
            let task = URLSession.shared.dataTask(with: request as URLRequest){
                data, response, error in
                if error != nil {
                    print("error is:: \(error!.localizedDescription)")
                    return;
                }
                //parsing the response
                do {
                    // converting response to NSDictionary
                    let myJSON = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary

                    DispatchQueue.main.async {
                        if let parseJSON = myJSON{
                            var responseCode: Int!
                            var responseMessage: NSArray!

                            //getting the json response
                            responseCode = parseJSON["RESPONSECODE"] as! Int?
                            responseMessage = parseJSON["RESPONSEMESSAGE"] as! NSArray?

                            if responseCode == 0 {
                                for obj in responseMessage{
                                    if let dict = obj as? NSDictionary{
                                        self.offerContent = dict.value(forKey: "CONTENT") as? String
                                        self.offerTitle = dict.value(forKey: "TITLE") as? String
                                        self.suggestionLabel = dict.value(forKey: "SUGGESTION_LABEL") as? String
                                        self.suggestionScreen = dict.value(forKey: "SUGGESTION_SCREEN") as? String
                                        self.offerImage = dict.value(forKey: "IMAGE") as? URL
//                                        print("image:: \(self.offerImage!)")

                                        let offerImageView = UIImageView()
                                        self.darkView.addSubview(offerImageView)
                                        offerImageView.heightAnchor.constraint(equalToConstant: 30).isActive = true
                                        offerImageView.widthAnchor.constraint(equalTo: self.darkView.widthAnchor).isActive = true
                                        offerImageView.topAnchor.constraint(equalTo: self.darkView.topAnchor, constant: 20).isActive = true
                                        offerImageView.image = UIImage(data: self.offerImage)
                                    }
                                }
                            }

                            print(parseJSON)
                        }
                        }
                }catch{
                    print("catch:: \(error.localizedDescription)")
                }

            }
            task.resume()

- chevi99

---

你的 dict.value(forKey: "IMAGE") 内容是一个 URL 吗？ - GIJOW

你可以使用SDWebImage来显示图片URL。 - Muhammed Azharudheen

@GIJOW 是的，它包含URL。因此我已编辑了我的代码以使其成为URL。 - chevi99

可能是在Swift中从URL加载/下载图像的重复问题。 - GIJOW

你可以参考这篇文章：https://dev59.com/PmAf5IYBdhLWcg3w0Vi7 另外，你正在将你的URL处理为数据（二进制数据）UIImage(data: self.offerImage)。这样是行不通的。 - GIJOW

谢谢@MuhammedAzharudheen，我导入了SDWebImage，现在它可以正常工作了。 - chevi99

Answer 1

试试这段代码。

let url = URL(string: "IMAGE URL HERE")
let data = try? Data(contentsOf: url)

if let imageData = data {
    let image = UIImage(data: imageData)
}

- Keyur Faldu

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太简单了！谢谢 - Daniel Beltrami

如果我想要在请求中发送一些标头怎么办？ - OhhhThatVarun

Answer 2

导入并使用Kingfisher

self.imageview.kf.setImage(with: "url")

- Luiz Henrique