Swift從服務器獲取圖像的最佳方式是什麼？

Question

我在我的網站的服務器上有一個圖像，我想通過Swift獲取它。通常我只是通過PHP發送數據到Swift使用HTTP請求，但我不知道如何發送圖像。我該如何做？

Answer 1

這是我下載圖像功能，你只需要下載網址：

let imageCache = NSCache<AnyObject, AnyObject>() 

func downloadImageFromURL(string: String) -> UIImage { 

    if let cachedImage = imageCache.object(forKey: string as AnyObject) as? UIImage { 

     return cachedImage 

    } else { 

     let data = NSData(contentsOf: URL(string: string)!) 
     return UIImage(data: data! as Data)! 

    } 

} 

您只需撥打：let image = downloadImageFromURL("yourURL")

編輯

這是直接下載圖片到版我以前用過的imageView;這是一個不同的方法，也許它會加載速度更快：

let imageCache = NSCache<AnyObject, AnyObject>() 

extension UIImageView { 


func downloadImage(from imgURL: String!) { 

    self.image = nil 

    // Check if there's an image in the cache 

    if let cachedImage = imageCache.object(forKey: imgURL as AnyObject) as? UIImage { 
     self.image = cachedImage 
     return 
    } 

    // Otherwise, download image from Firebase via URL-string 

    let url = URLRequest(url: URL(string: imgURL)!) 

    let task = URLSession.shared.dataTask(with: url) { 
     (data, response, error) in 

     if error != nil { 
      print(error!) 
      return 
     } 

     DispatchQueue.main.async { 
      if let image = UIImage(data: data!) { 
       imageCache.setObject(image, forKey: imgURL as AnyObject) 
      } 
      self.image = UIImage(data: data!) 
     } 

    } 

    task.resume() 
} 
}