如何在展开/折叠后强制重绘NSOutlineView中的组行

Question

我尝试拨打setNeedsDysplay:和setNeedsDisplayInRect:，但{@ 1}}和drawBackgroundInRect:没有为小组行调用，而是为其他所有内容调用

这是我的一段代码：

drawSeparatorInRect:

修改

这就是我提出的：

- (void)outlineView:(NSOutlineView *)outlineView didAddRowView:(NSTableRowView *)rowView forRow:(NSInteger)row {
    id prevItem = [outlineView itemAtRow:row - 1];
    if ([self outlineView:outlineView isGroupItem:prevItem]) {
        id view = [self outlineView:outlineView rowViewForItem:prevItem];
        if (view) {
            [view setNeedsDisplay:YES];
        }
    }
}

......但在某些情况下它太慢了

Answer 1

好的，这就是诀窍：

- (void)outlineViewItemDidCollapse:(NSNotification *)notification {
    NSInteger row = [_outlineView rowForItem:notification.userInfo[@"NSObject"]];
    NSView *rowView = [_outlineView rowViewAtRow:row makeIfNecessary:NO];
    [rowView setNeedsDisplay:YES];
}

- (void)outlineViewItemDidExpand:(NSNotification *)notification {
    NSInteger row = [_outlineView rowForItem:notification.userInfo[@"NSObject"]];
    NSView *rowView = [_outlineView rowViewAtRow:row makeIfNecessary:NO];
    [rowView setNeedsDisplay:YES];
}