objective-c - IKImageBrowserView 中重新排序的数据源方法，未被调用

Question

- (BOOL) imageBrowser:(IKImageBrowserView *) aBrowser moveItemsAtIndexes: (NSIndexSet *)indexes toIndex:(NSUInteger)destinationIndex;

未调用 IKImageBrowserView 中用于重新排序的数据源方法。 Nib 连接已正确。 setAllowsReorderdering 设置为 YES。

但它还没有工作。

- (void)imageBrowser:(IKImageBrowserView *)aBrowser removeItemsAtIndexes:(NSIndexSet *)indexes

同时，上述删除项目的方法被正确调用，并且运行完美。为什么不重新排序？

当我拖动项目进行重新排序时，将调用以下拖放代码。这里实际上有 2 个 IKImageBrowserView。

- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender
{           
NSPoint draggingLocation = [self convertPoint:[sender draggingLocation] fromView:nil];
NSRect contentRect  = [[_indexContentBrowserView enclosingScrollView] frame];
BOOL isForContent   = (contentRect.origin.x < draggingLocation.x) && (draggingLocation.x < contentRect.origin.x + contentRect.size.width);

if (isForContent)
{
    if ([sender draggingSource] == _indexContentBrowserView)
    {
        return NSDragOperationMove;
    }
    else
    {
        NSPasteboard *pb = [sender draggingPasteboard]; 
        NSString * type = [pb availableTypeFromArray:[NSArray arrayWithObject:NSFilenamesPboardType]];

        if(type != nil)
        {
            return NSDragOperationEvery;
        }           
    }
}
else
{
    if ([sender draggingSource] == _indexListBrowserView)
    {
        return NSDragOperationMove;
    }
    else
    {
        NSPasteboard *pb = [sender draggingPasteboard]; 
        NSString * type = [pb availableTypeFromArray:[NSArray arrayWithObject:NSFilenamesPboardType]];

        if(type != nil)
        {
            return NSDragOperationEvery;
        }           
    }
}

return NSDragOperationNone;



}

Answer 1

- (BOOL)prepareForDragOperation:(id <NSDraggingInfo>)sender
{
    [super prepareForDragOperation:sender];

    if(nil == [sender draggingSource])
        return YES;

    BOOL success = NO;

    if (_galleryMultiImageFileBrowserView != [sender draggingSource])
    {
        //Code for checking the duplication of files
    }
    else
    {
        success = YES;
    }
    return success;
    //I had returned NO here which was the reason for the problem.
}

我发现了问题。这是我的错误。上面的代码是更正后的代码。早些时候，当[sender DraggingSource]是IKImageBrowserView时，它返回NO。这就是 moveItemsAtIndexes: 方法未被调用的原因。

@Dov:感谢 Dov 抽出宝贵的时间。多谢。@Joaquin:非常感谢。