拖放在IKImageBrowserView中不起作用

Question

我用AES算法加密了图像。当我在IKImageBrowserView中使用这些图像时，它可以正确地显示图像，但我无法将图像拖放到粘贴板上。我将图像表示设置为IKImageBrowserView图像对象，如下所示

- (NSString *)  imageRepresentationType
{
    return IKImageBrowserNSDataRepresentationType;
}
- (id)  imageRepresentation
{
   return  [[NSData dataWithContentsOfFile:path]decryptWithString:PASS];
}

但是当我像这样给予的时候，它就起作用了

- (NSString *)  imageRepresentationType
{
    return IKImageBrowserPathRepresentationType;
}

- (id)  imageRepresentation
{
    return path;
}

上面的代码是有效的，因为当我从IKImageBrowserView拖动图像时，它将返回图像的路径。

现在我需要做的是将IKImageBrowserView中的加密图像拖放到粘贴板中。

Answer 1

我终于明白了。

对于非文件路径表示的图像，我们需要实现-imageBrowser:writeItemsAtIndexes:toPasteboard:

- (NSUInteger) imageBrowser:(IKImageBrowserView *) aBrowser writeItemsAtIndexes:(NSIndexSet *) itemIndexes toPasteboard: (NSPasteboard *)pasteboard
{
        NSUinteger index;

        //instantiate an array to store paths
        filesArray = [NSMutableArray array];

        //for each index...
for(index = [itemIndexes firstIndex]; index != NSNotFound; index = [itemIndexes indexGreaterThanIndex:index]){

                //...get the path you want to add to the pasteboard
                id myDatasourceItem = [_myDatasourceArray objectAtIndex:index];
                NSString *path = [myDatasourceItem myLargeImageFilePath];

                //add it to your array
                [filesArray addObject:path];
        }

        //declare the pasteboard will contain paths
[pasteboard declareTypes:[NSArray arrayWithObjects:NSFilenamesPboardType,nil] owner:self];

        //set the paths
[pasteboard setPropertyList:filesArray forType:NSFilenamesPboardType];

         //return the number of items added to the pasteboard
         return [filesArray count];
}