objective-c – 如何在NSOutlineView中重新加载自定义NSTableRowView？

概述我正在尝试修改行扩展/折叠时在我的NSOutlineView中使用的自定义NSTableRowView的外观.我的NSOutlineViewDelegate包括： - (NSTableRowView *)outlineView:(NSOutlineView *)outlineView rowViewForItem:(id)item{ ... return rowView;} @H_502_4@ 我正在尝试修改行扩展/折叠时在我的NSOutlineVIEw中使用的自定义NStableRowVIEw的外观.我的NSOutlineVIEwDelegate包括：

- (NStableRowVIEw *)outlineVIEw:(NSOutlineVIEw *)outlineVIEw rowVIEwForItem:(ID)item{    ...    return rowVIEw;}- (voID)itemDIDExpand:(NSNotification *)notification{    NSDictionary *userInfo = [notification userInfo];    ID item = [userInfo objectForKey:@"NSObject"];    NSOutlineVIEw *outlineVIEw = [notification object];    [outlineVIEw reloadItem:item];}

遗憾的是,这不会重新加载自定义行视图.

重新加载整个NSOutlineVIEw的数据：

- (voID)itemDIDExpand:(NSNotification *)notification{    [outlineVIEw reloadData];}

但是对于大量数据而言,这可能是耗时的,并且经常导致旋转的沙滩球.

是否可以仅为单个顶级项重新加载自定义行视图？

@H_502_4@解决方法 请尝试以下方法：

-(voID)outlineVIEw:(NSOutlineVIEw *)outlineVIEw dIDAddRowVIEw:(NStableRowVIEw *)rowVIEw forRow:(NSInteger)row {    acolor = [NScolor colorWithCalibratedRed:(r/255.0f) green:(g/255.0f) blue:(b/255.0f) Alpha:1.0];    [vIEw setBackgroundcolor:acolor];}

您可以进一步前进以获取行对象,然后确定特定行所需的颜色.

-编辑-

如果您希望更改父单元格视图以显示它已被展开,那么您已经为NSOutlinevIEw实现了错误的方法.实现如下方法：

-(voID)outlineVIEwItemWillExpand:(NSNotification *)notification {    ID theObject = [[notification userInfo] objectForKey:@"NSObject"];    NSInteger row = [theOutlineVIEw rowForItem:theObject];    NStableRowVIEw *theRowVIEw = [theOutlineVIEw rowVIEwAtRow:row makeIfNecessary:NO];    int r = 110;    int g = 110;    int b = 110;    NScolor *acolor = [NScolor colorWithCalibratedRed:(r/255.0f) green:(g/255.0f) blue:(b/255.0f) Alpha:1.0];    [theRowVIEw setBackgroundcolor:acolor];}

@H_502_4@ @H_502_4@ @H_502_4@ @H_502_4@ 总结

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