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我正在尝试使用 CFStringCompare 来比较字符串，但我不断得到一个Could not find an overload for == that accepts the supplied arguments.更具体地说，这段代码看起来像：

func imagePickerController(picker: UIImagePickerController!, didFinishPickingMediaWithInfo info: NSDictionary!)
{
let mediaType = info.objectForKey(UIImagePickerControllerMediaType) as String


if CFStringCompare(mediaType as NSString!,  kUTTypeMovie, compareOptions: 0) == CFComparisonResult.CompareEqualTo

{

   var moviePath : NSString = info.objectForKey(UIImagePickerControllerMediaURL).path

   if UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(moviePath)
   {

      UISaveVideoAtPathToSavedPhotosAlbum(moviePath, nil, nil, nil)

   }

}
else ...

我确定我只是搞砸了语法，但是我尝试将 mediaType 设为可选字符串并展开它：

let mediaType = info.objectForKey(UIImagePickerControllerMediaType) as String?

仍然could not find overload for ==。

有任何想法吗？先感谢您！

4

1 回答 1

1

调用CFStringCompare() 方法不正确（注意：compareOptions是参数不是名称），试试这样：

   let compareResult = CFStringCompare(mediaType as NSString!, kUTTypeMovie, CFStringCompareFlags.CompareCaseInsensitive)

   if compareResult == CFComparisonResult.CompareEqualTo {

              println("Equal")

          }
    else {
              println("Not Equal")

         }

您可以根据需要提供不同的标志CFStringCompareFlags(0)。

如果您不使用比较标志，可以通过以下方式轻松完成：

if mediaType == kUTTypeMovie {
//Equal
}
于 2014-06-30T11:48:16.733 回答