Swift从服务器获取图像的最佳方式是什么？

Question

我在我的网站的服务器上有一个图像，我想通过Swift获取它。通常我只是通过PHP发送数据到Swift使用HTTP请求，但我不知道如何发送图像。我该如何做？

Answer 1

这是我下载图像功能，你只需要下载网址：

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)! 

    } 

} 

您只需拨打：let image = downloadImageFromURL("yourURL")

编辑

这是直接下载图片到版我以前用过的imageView;这是一个不同的方法，也许它会加载速度更快：

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() 
} 
}