NSOutlineView源列表的数据 [英] Data for NSOutlineView Source List

问题描述

我有一个Source类的Delegate类。但是我不知道outlineView：objectValueForTableColumn：byItem：的返回变量应该是什么类型。

i've got a Delegate class for a Source List. But i don't know what type the return variable of outlineView:objectValueForTableColumn:byItem: should be.

目前，我的代码看起来像这样，所有结构工作但是没有显示文本：

At the Moment my code looks like this, all the structure things work but there is no text shown:

@interface DataSource : NSObject<NSOutlineViewDelegate,NSOutlineViewDataSource>

@end

.m

@implementation DataSource
// Data Source methods

- (NSInteger)outlineView:(NSOutlineView *)outlineView numberOfChildrenOfItem:(id)item {

    return (item == nil) ? 1 : [item numberOfChildren];
}


- (BOOL)outlineView:(NSOutlineView *)outlineView isItemExpandable:(id)item {
    return (item == nil) ? YES : ([item numberOfChildren] != -1);
}


- (id)outlineView:(NSOutlineView *)outlineView child:(NSInteger)index ofItem:(id)item {

    return (item == nil) ? [FileSystemItem rootItem] : [(FileSystemItem *)item childAtIndex:index];
}

//-(id)outlineView:(NSOutlineView *)outlineView child:(NSInteger)index ofItem:(id)item
-(id)outlineView:(NSOutlineView *)outlineView objectValueForTableColumn:(NSTableColumn *)tableColumn byItem:(id)item {
    return @"Some String";
}


@end

我有制作了一个示例应用程序来显示差异。 图片在这里

I have made a example app to show the difference. Image is here

推荐答案

我想您有基于视图的NSTableView。在您的委托中，您应该实现方法-（id）outlineView：（NSOutlineView *）ov viewForTableColumn：（NSTableColumn *）tableColumn 。可能看起来像这样：

I suppose you have view-based NSTableView. In you delegate you should implement method - (id)outlineView:(NSOutlineView *)ov viewForTableColumn:(NSTableColumn *)tableColumn. It may looks like this:

- (id)outlineView:(NSOutlineView *)ov viewForTableColumn:(NSTableColumn *)tableColumn item:(id)item{
    if ([[item representedObject] parent] == nil) {
        return [ov makeViewWithIdentifier:@"HeaderCell" owner:self];
    }else{
        return [ov makeViewWithIdentifier:@"DataCell" owner:self];
    }
}

HeaderCell 和 DataCell 是表单元格视图的默认标识符。

HeaderCell and DataCell are default identifiers of the Table Cell Views.

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