Question

我试图找出如何在代码中100％执行源列表。我一直在攻击SideBar演示和各种SO问题/答案并且已经接近，但并不完全在那里。我在下面复制了我的代码，这看起来很有效，因为它构建了一个视图，我可以选择3个空单元格。我无法弄清楚的是如何让我的文本显示在这些单元格中。我最终将以我自己的观点取而代之，但我现在愿意让股票渲染工作..

在我的控制器中：

@implementation SourceListController {
    NSScrollView *_scrollView;
    NSOutlineView *_sourceList;
    SourceListDataSource *_sourceListDataSource;
}

- (void)loadView {
    _scrollView = [[NSScrollView alloc] init];

    _sourceList = [[NSOutlineView alloc] init];
    _sourceListDataSource = [[SourceListDataSource alloc] init];

    [_sourceList setSelectionHighlightStyle:NSTableViewSelectionHighlightStyleSourceList];
    NSTableColumn *c = [[NSTableColumn alloc] initWithIdentifier: @"Column"];
    [c setEditable: NO];
    [c setMinWidth: 150.0];
    [_sourceList addTableColumn: c];
    [_sourceList setOutlineTableColumn:c];
    [_sourceList setDelegate:_sourceListDataSource];
    [_sourceList setDataSource:_sourceListDataSource];

    [_scrollView setDocumentView:_sourceList];
    [_scrollView setHasVerticalScroller:YES];

    [_sourceList reloadData];

    NSLog(_sourceList.dataSource == _sourceListDataSource ? @"YES" : @"NO");

    self.view = _scrollView;

}

在我的数据源/委托中：

@implementation SourceListDataSource {

}

- (NSInteger)outlineView:(NSOutlineView *)outlineView numberOfChildrenOfItem:(id)item {
    return item == nil ? 3 : 0;
}

- (id)outlineView:(NSOutlineView *)outlineView child:(NSInteger)index ofItem:(id)item {
    return [NSObject new];
}

- (BOOL)outlineView:(NSOutlineView *)outlineView isItemExpandable:(id)item {
    return item == nil;
}

- (NSView *)outlineView:(NSOutlineView *)outlineView viewForTableColumn:(NSTableColumn *)tableColumn item:(id)item {
    NSLog(@"Here %f", tableColumn.width);
    NSTableCellView *result = [[NSTableCellView alloc] init];
    NSTextField *textField = [[NSTextField alloc] init];
    [textField setStringValue:@"Test"];
    [result addSubview:textField];
    return result;
}

更新：进一步挖掘告诉我viewForTableColumn甚至没有被调用..我很难过为什么..

更新2：弄清楚它是缺少的列和outlineTableColumn导致不调用委托方法。我修复了这个并更新了代码，但仍然没有显示任何文字。

Answer 1

您的委托方法需要更改，它不会以这种方式工作，也不会使用视图的新缓存方法。大多数情况下，使用NSTableCellView.textField属性而不是添加自己的NSTextField而没有框架和框架约束。因此，应该工作的代码如下所示：

- (NSView *)outlineView:(NSOutlineView *)outlineView viewForTableColumn:(NSTableColumn *)tableColumn item:(id)item {

    NSTableCellView *result = [outline makeViewWithIdentifier:@"MyView" owner:self];
    if (result == nil) {

         // Create the new NSTextField with a frame of the {0,0} with the width of the table.
         // Note that the height of the frame is not really relevant, because the row height will modify the height.
         CGRect myRect = CGRectMake(0,0,outlineView.framesize.width,0);
         result = [[NSTableCellView alloc] initWithFrame:myRect];

         // The identifier of the view instance is set to MyView.
         // This allows the cell to be reused.
         result.identifier = @"MyView";
    }

    result.textField.stringValue = @"Test";
    return result;
}

所有上述内容都在SO中输入。

没有NIB的NSOutlineView源列表

1 个答案: