Swift 4錯誤：「無法將類型'URLRequest'的值轉換爲期望的參數類型'URL！'」

Question

正是標題所說的。我收到了這個錯誤，並且不確定這是否與Swift 4轉換有關。我一直在努力解決代碼，但沒有運氣，所以決定把這個問題放在SO上。是越來越拋出這個錯誤就行： 「cell.businessPostImage.setImageWith（postRequest，」 感謝

cell.businessPostImage.image = nil 
     if let postURL = URL(string: downloadURL) { 
      let postRequest = URLRequest(url: postURL) 
      cell.businessPostImage.setImageWith(postRequest, placeholderImage: nil, options: 
      { (imageRequest, imageResponse, image) in 
        cell.businessPostImage.contentMode = UIViewContentMode.scaleToFill 
        cell.businessPostImage.image = image 
      }, completed: { (imageRequest, imageResponse, error) -> Void in 
       // failure downloading image 
       print("Error downloading Firebase post image") 
       print(error) 
      }) 
     } 

Answer 1

你必須使用這樣的：。

if let postURL = URL(string: downloadURL) { 
    let postRequest = URLRequest(url: postURL) 
    cell.businessPostImage.setImageWith(postURL, placeholderImage: nil, options: SDWebImageOptions.ProgressiveDownload, completed: { (imageRequest, imageResponse, error) -> Void in 
     // failure downloading image 
     print("Error downloading Firebase post image") 
     print(error) 
    }) 
}