ios - Swift 4:无法将“数据”类型的值转换为预期的参数类型“数据”

Question

我正在使用Xcode 9，Swift 4。

我正在尝试使用以下代码从URL在ImageView中显示图像:

func getImageFromUrl(sourceUrl: String) -> UIImage {
        let url = URL(string: sourceUrl)
        let dict = NSDictionary(contentsOf: url!)
        let data = Data(dictionary: dict!)
        let image = UIImage(data: data!)
        return image
}

但是我在let image = UIImage(data: data!)中出错。

编译器说:

无法将“数据”类型的值转换为预期的参数类型“数据”

我究竟做错了什么？

Answer 1

/// Returns nil if image data is not correct or some network error has happened
func getImageFromUrl(sourceUrl: String) -> UIImage? {
  if let url = URL(string: sourceUrl) {
    if let imageData = try? Data(contentsOf:url) {
      return UIImage(data: imageData)
    }
  }
  return nil
}