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,由于数据量很大,这可能非常耗时,并且通常会导致旋转的沙滩球。
是否可以仅为单个顶级项重新加载自定义行视图?
答案 0 :(得分:6)
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。
- 的修改 -
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];
}
答案 1 :(得分:1)
在rowViewForItem方法中尝试此操作。 它重新加载并重新显示项目的数据。
- (void)reloadItem:(id)item;