Ios 无法分配类型为'；UIImage？&x27；输入'；NSData？&x27；斯威夫特3

我正在为应用程序使用

CoreData

。我在数据模型中将图像设置为

BinaryData

。但我已经从服务器中获取了图像作为

UIImage

，它抛出的错误如下：

cannot assign value of type 'UIImage?' to type 'NSData?

我搜索了一下，但找不到任何相似的解决方案。有人能在swift 3中帮助我吗？
我的代码是：

let url1:URL = URL(string:self.appDictionary.value(forKey: "image") as! String)!
let picture = "http://54.243.11.100/storage/images/news/f/"
let strInterval = String(format:"%@%@",picture as CVarArg,url1 as CVarArg) as String as String
let url = URL(string: strInterval as String)
SDWebImageManager.shared().downloadImage(with: url, options: [],progress: nil, completed: {[weak self] (image, error, cached, finished, url) in
   if self != nil {
      task.imagenews = image //Error:cannot assign value of type 'UIImage?' to type 'NSData?'
   }
})

---

错误信息非常清楚-无法将

UIImage

对象分配给

NSData

类型的变量

要将

UIImage

转换为Swift的

数据

类型，请使用

UIImagePNGRepresentation

var data : Data = UIImagePNGRepresentation(image)

---

请注意，如果您使用的是Swift，您应该使用Swift的类型

Data

，而不是

NSData

，您必须将图像转换为

数据（或
NSData
），以支持
imagenews
数据类型

试试这个

let url1:URL = URL(string:self.appDictionary.value(forKey: "image") as! String)!
let picture = "http://54.243.11.100/storage/images/news/f/"
let strInterval = String(format:"%@%@",picture as CVarArg,url1 as CVarArg) as String as String
let url = URL(string: strInterval as String)
SDWebImageManager.shared().downloadImage(with: url, options: [],progress: nil, completed: {[weak self] (image, error, cached, finished, url) in
   if self != nil {

     if let data = img.pngRepresentationData {  // If image type is PNG
           task.imagenews = data     
      } else if let data = img.jpegRepresentationData { // If image type is JPG/JPEG
          task.imagenews = data     
     } 


   }
})



// UIImage extension, helps to convert Image into data
extension UIImage {

        var pngRepresentationData: Data? {
            return UIImagePNGRepresentation(img)
        }

        var jpegRepresentationData: Data? {
            return UIImageJPEGRepresentation(self, 1.0)
        }
    }

变量task.imagenews的类型是什么？为了帮助您，我们需要更多。什么是task.imagenews？你想用它做什么？你的答案很好。。我把它弄得很复杂