从 URL 获取图像并将其附加到数组

Posted 2023-02-23

【中文标题】从 URL 获取图像并将其附加到数组

【英文标题】：Getting Image from URL and append it to array

【发布时间】：2020-04-27 22:34:47

【问题描述】：

我正在尝试从URL 获取images 并将它们附加到array。这如果我的function 为它：

func doStuff(html: String?)
    do 
        let doc: Document = try SwiftSoup.parse(html ?? "")

        let priceClasses: Elements? = try doc.select("[class~=(?i)price]")

            for priceClass: Element in priceClasses!.array() 
            let priceText : String = try priceClass.text()
            print(try priceClass.className())
            print("pricetext: \(priceText)")
        

        let srcs: Elements = try doc.select("img[src]")
        let srcsStringArray: [String?] = srcs.array().map  try? $0.attr("src").description 

        for imageName in srcsStringArray 
            if (imageName?.matches("^https?://(?:[a-z0-9\\-]+\\.)+[a-z]2,6(?:/[^/#?]+)+\\.(?:jpg|gif|png)$"))! 
                print(imageName!)

                let imageView = UIImageView()
                imageView.downloaded(from: imageName!) 

                    if let image = imageView.image 
                        self.imagesArray!.append(image)
                     else 
                        print("Image '\(String(describing: imageName))' does not exist!")
                    

                
            

        

     catch Exception.Error( _, let message) 
        print(message)
     catch 
        print("error")

    

此代码不起作用，因为它总是退出并打印 <imageName> does not exist! 。奇怪的是fileName 是一个正确的名字！

例如：

https://www.adidas.de/on/demandware.static/-/Sites-adidas-DE-Library/default/dw817801e3/Originals_Brand_Nav_Title.png

这就是我从URLimageimage 的方式：

extension UIImageView 
func downloaded(from url: URL, contentMode mode: UIView.ContentMode = .scaleAspectFit) 
    contentMode = mode
    URLSession.shared.dataTask(with: url)  data, response, error in
        guard
            let httpURLResponse = response as? HTTPURLResponse, httpURLResponse.statusCode == 200,
            let mimeType = response?.mimeType, mimeType.hasPrefix("image"),
            let data = data, error == nil,
            let image = UIImage(data: data)
            else  return 
        DispatchQueue.main.async() 
            self.image = image
        
    .resume()

func downloaded(from link: String, contentMode mode: UIView.ContentMode = .scaleAspectFit, finished: () -> Void) 
    guard let url = URL(string: link) else  return 
    downloaded(from: url, contentMode: mode)
    finished()

有人知道为什么我不能将images 附加到我的array 吗？我卡住了..

【问题讨论】：

你的图片在 Imageview 上可见吗？

@AnilKumar imageView 只是一个占位符，我在其中使用 downloaded(from: imageName!) 设置图像。我认为这就是问题所在，因为如果我只是在 real imageView 上调用 .downloaded(from: imageName!)，图像就会变得可见

【参考方案1】：

我通过更改load image 的方式解决了这个问题：

extension UIImage 

public static func loadFrom(url: URL, completion: @escaping (_ image: UIImage?) -> ()) 
    DispatchQueue.global().async 
        if let data = try? Data(contentsOf: url) 
            DispatchQueue.main.async 
                completion(UIImage(data: data))
            
         else 
            DispatchQueue.main.async 
                completion(nil)
            
        
    

有了这个，我简单地调用：

for imageName in srcsStringArray 
            if (imageName?.matches("^https?://(?:[a-z0-9\\-]+\\.)+[a-z]2,6(?:/[^/#?]+)+\\.(?:jpg|gif|png)$"))! 

                guard let url = URL(string: imageName!) else  return 

                UIImage.loadFrom(url: url)  image in

                    if let image = image 
                        print("append")
                       self.imagesArray.append(image)
                     else 
                        print("Image '\(String(describing: imageName))' does not exist!")