//从路径中获得完整的文件名 （带后缀） 对从相册中取出的图片，视频都有效。

   NSString *fileName = [filePath lastPathComponent];

 

   //获得文件名 （不带后缀）

   NSString *fileName1 = [filePath stringByDeletingPathExtension];

 

   //获得文件的后缀名 （不带'.'）

   NSString *suffix = [filePath pathExtension];

    

 

 

 

 

//    拿到图片名字  亲测只对图片有效

   NSURL *refURL = [info valueForKey:UIImagePickerControllerReferenceURL];

define the block to call when we get the asset based on the url (below)

    ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *imageAsset)

   {

        ALAssetRepresentation *imageRep = [imageAsset defaultRepresentation];

       DNLog(@"[imageRep filename] : %@", [imageRep filename]);

    };

   

//    get the asset library and fetch the asset based on the ref url (pass in block above)

    ALAssetsLibrary* assetslibrary = [[ALAssetsLibrary alloc] init];

    [assetslibrary assetForURL:refURL resultBlock:resultblock failureBlock:nil];

    [picker dismissViewControllerAnimated:YES completion:nil];