我正在实施 NSOutlineView 并实施了以下方法,
-(void) initOutlineView{
pMyOutlineView = [[[MyUICustomOutlineView alloc] initWithFrame:clipViewBounds]
autorelease];
NSTableColumn* firstColumn = [[[NSTableColumn alloc] initWithIdentifier:@"firstColumn"] autorelease];
[firstColumn setWidth:25];
[pMyOutlineView addTableColumn:firstColumn];
NSTableColumn* secondColumn = [[[NSTableColumn alloc] initWithIdentifier:@"secondColumn"] autorelease];
NSTextFieldCell *pCell = [[NSTextFieldCell alloc]init];
[secondColumn setDataCell:pCell];
[secondColumn setWidth:180];
[pMyOutlineView addTableColumn:secondColumn];
[pMyOutlineView setRowHeight:30];
pNodeArray = [[NSMutableArray alloc]initWithCapacity:10];
PointerNode *pNode = pointerList.getHead();
int idx =0;
void *ptr = nil;
while ( contact ) {
[pNodeArray insertObject:[NSValue valueWithPointer:(void *)pNode]
atIndex:idx];
pNode = pNode->getNext();
idx++;
}
[pMyOutlineView setDataSource:self];
// this is to tell myCustomOutlineView to delegate Menu and Mouse event to
// this interface
[pMyOutlineView setDataDelegate:self];
[scrollView setDocumentView:pMyOutlineView];
[pMyOutlineView setDelegate:self];
}
并实现了以下委托方法
- (NSInteger)outlineView:(NSOutlineView *)outlineView numberOfChildrenOfItem:(id)item {
// Here it will come for the top level element
if(item==nil)
return pointerList.size();
/*
If its not NULL then it must be some child element
*/
if([item isKindOfClass:[NSValue class]])
{
// yes it may have children
PointerNode *pNode = (PointerNode *)[item pointerValue];
if(pNode->hasChildren()){
return pNode->getNoOfChild();
}
}
return 0; // means this element not going to have any children
}
其他一些方法
- (NSInteger)outlineView:(NSOutlineView *)outlineView numberOfChildrenOfItem:(id)item
并获取数据
我正在关注一些博客、教程,我面临的问题是作为标准文档,它应该在 numberOfChildrenOfItem 中针对我们需要计算并发送该项目的子项编号的每个元素命中,但我面临的问题是仅使用一次上述功能,并且该项目也为零,即它不适用于其他元素,我是否缺少任何需要委托的方法
我覆盖的其他方法如下,
- (BOOL)outlineView:(NSOutlineView *)outlineView isItemExpandable:(id)item
- (id)outlineView:(NSOutlineView *)outlineView objectValueForTableColumn:(NSTableColumn *)aTableColumn byItem:(id)item
- (void)outlineView:(NSOutlineView *)outlineView setObjectValue:(id)object forTableColumn:(NSTableColumn *)tableColumn byItem:(id)item
- (void)outlineView:(NSOutlineView *)outlineView willDisplayCell:(id)cell forTableColumn:(NSTableColumn *)tableColumn item:(id)item
请告诉我,我缺少哪种方法