objective-c – 虽然我已经实现了委托方法,但是没有为NSOutlineView启用拖放功能

我无法为NSOutlineView启用拖放功能.我已经实现了NSOutlineView Delegate的相关方法.

但似乎当我点击一个项目时,我甚至无法拖动它(我看不到动画).

- (BOOL)outlineView:(NSOutlineView *)outlineView acceptDrop:(id < NSDraggingInfo >)info item:(id)item childindex:(NSInteger)index
{
    return YES;
}

- (NSDragOperation)outlineView:(NSOutlineView *)outlineView validateDrop:(id < NSDraggingInfo >)info proposedItem:(id)item proposedChildindex:(NSInteger)index
{
    return NSDragOperationMove; //not sure about this one.
}

谢谢

更新：

我正在实现forOSX> = 10.5

- (BOOL)outlineView:(NSOutlineView *)outlineView writeItems:(NSArray *)items toPasteboard:(NSPasteboard *)pboard
{
    Nsstring *pasteBoardType = [self pasteboardTypeForTableView:outlineView];
    [pboard declareTypes:[NSArray arrayWithObject:pasteBoardType] owner:self];

    NSData *rowData = [NSKeyedArchiver archivedDataWithRootObject:items];
    [pboard setData:rowData forType:pasteBoardType];
        return YES;
}

解决方法

要使大纲视图成为拖动源,您必须实现：

- (BOOL)outlineView:(NSOutlineView *)outlineView writeItems:(NSArray *)items toPasteboard:(NSPasteboard *)pasteboard;

这应该解决你所描述的问题,但除此之外你还有很多工作要做.