Question

您好我正在尝试在NSTableView中使用NSPopUpButtonCell。基本上，当您在弹出窗口中选择一个项目时，我希望它显示在表格视图列/行中。当按下弹出单元格中的项目时，我使用“tableView：setObject：forTableColumn：row”将其存储在数据源中，然后当表请求检索数据并在“tableView：objectValueForTableColumn”中设置弹出单元格的状态时：行：”。请查找附上我的代码。我现在完全被困住了。我希望有人能理解它。提前谢谢。

这是在控制器内部：

  //Create the table columns
  NSTableColumn *nameColumn = [[NSTableColumn alloc] initWithIdentifier:LXDetailItemName];
  NSTableColumn *dataTypeColumn = [[NSTableColumn alloc] initWithIdentifier:LXDetailItemDataType];
  NSTableColumn *deviceColumn = [[NSTableColumn alloc] initWithIdentifier:LXDetailItemDevice];

  //Data type column drop down
  NSPopUpButtonCell *dataTypeDropDownCell = [[NSPopUpButtonCell alloc] initTextCell:@"" pullsDown:YES];
  [dataTypeDropDownCell setBordered:NO];
  [dataTypeDropDownCell setEditable:YES];

  NSArray *dataTypeNames = [NSArray arrayWithObjects:@"NULL", @"String", @"Money", @"Date", @"Int", nil];
  [dataTypeDropDownCell addItemsWithTitles:dataTypeNames];
  [dataTypeColumn setDataCell:dataTypeDropDownCell];

  //Add the columns to the table
  [tableView addTableColumn:nameColumn];
  [tableView addTableColumn:dataTypeColumn];
  [tableView addTableColumn:deviceColumn]; 
    enter code here

这是在datasource / delegate类中。

enter code here

@implementation LXTestDataSource

- (id)init
{
 self = [super init];

 if (self)
 { 
  tableContents = [[NSMutableArray alloc] init];

  //Setup test data
  NSMutableArray *keys = [NSMutableArray arrayWithObjects:LXDetailItemName, LXDetailItemDataType, LXDetailItemDevice, nil];
  NSMutableArray *objects = [NSMutableArray arrayWithObjects:@"one", @"NULL", @"NULL", nil];

  for (int i = 0; i < 4; i++)
  {
   NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] initWithObjects:objects forKeys:keys];
   [tableContents addObject:dictionary];
   [dictionary release];
  }
 }

 return self;
}

- (NSInteger)numberOfRowsInTableView:(NSTableView *)aTableView
{
 return [tableContents count];
}


- (id)tableView:(NSTableView *)aTableView objectValueForTableColumn:(NSTableColumn *)aTableColumn row:(NSInteger)rowIndex
{ 
 if ([[aTableColumn identifier] isEqualToString:LXDetailItemDataType])
 {
  NSMutableDictionary *rowDictionary = [tableContents objectAtIndex:rowIndex];
  NSString *title = [rowDictionary objectForKey:LXDetailItemDataType];

  NSLog(@"objectValueForTableColumn: %@", title); //DEBUG

  return [NSNumber numberWithInt:[[aTableColumn dataCell] indexOfItemWithTitle:title]];
 }
 else if ([[aTableColumn identifier] isEqualToString:LXDetailItemDevice])
 {
  NSMutableDictionary *rowDictionary = [tableContents objectAtIndex:rowIndex];
  NSString *title = [rowDictionary objectForKey:LXDetailItemDevice];

  NSLog(@"objectValueForTableColumn: %@", title); //DEBUG

  return [NSNumber numberWithInt:[[aTableColumn dataCell] indexOfItemWithTitle:title]];
 }
 else
 {
  NSMutableDictionary *rowDictionary = [tableContents objectAtIndex:rowIndex];
  return [rowDictionary objectForKey:[aTableColumn identifier]]; 
 }
}


- (void)tableView:(NSTableView *)aTableView setObjectValue:(id)anObject forTableColumn:(NSTableColumn *)aTableColumn row:(NSInteger)rowIndex
{ 
 if ([[aTableColumn identifier] isEqualToString:LXDetailItemDataType])
 {  
  NSMenuItem *menuItem = [[aTableColumn dataCell] itemAtIndex:[anObject integerValue]];

  NSMutableDictionary *rowDictionary = [tableContents objectAtIndex:rowIndex];

  NSLog(@"%@", [menuItem title]); //DEBUG

  //Update the object value at the column index
  [rowDictionary setObject:[menuItem title] forKey:LXDetailItemDataType];
 }
 else if ([[aTableColumn identifier] isEqualToString:LXDetailItemDevice])
 {
  NSMenuItem *menuItem = [[aTableColumn dataCell] itemAtIndex:[anObject integerValue]];

  NSMutableDictionary *rowDictionary = [tableContents objectAtIndex:rowIndex];

  NSLog(@"%@", [menuItem title]); //DEBUG

  //Update the object value at the column index
  [rowDictionary setObject:[menuItem title] forKey:LXDetailItemDevice]; 
 }
 else
 {
  //Get the row
  NSMutableDictionary *rowDictionary = [tableContents objectAtIndex:rowIndex];

  //Update the object value at the column index
  [rowDictionary setObject:anObject forKey:[aTableColumn identifier]];
 }
}

@end

Answer 1

我想我已经明白了。我使用弹出单元格的方法“setTitle：”在单击菜单项后更新单元格的文本。这是我使用的表视图委托方法。

- (void)tableView:(NSTableView *)aTableView willDisplayCell:(id)aCell forTableColumn:(NSTableColumn *)aTableColumn row:(NSInteger)rowIndex
{
    if ([[aTableColumn identifier] isEqualToString:LXDetailItemDataType])
    {
        NSMutableDictionary *rowDictionary = [tableContents objectAtIndex:rowIndex];
        NSString *title = [rowDictionary objectForKey:LXDetailItemDataType];

        [aCell setTitle:title];
    }
    else if ([[aTableColumn identifier] isEqualToString:LXDetailItemDevice])
    {
        NSMutableDictionary *rowDictionary = [tableContents objectAtIndex:rowIndex];
        NSString *title = [rowDictionary objectForKey:LXDetailItemDevice];

        [aCell setTitle:title];
    }
}

Answer 2

我认为在tableView:setObjectValue:forTableColumn:row:中设置值之后您需要做的就是在表视图上调用reloadData以强制它使用您对数据模型所做的更改来更新自身。 NSPopUpButtonCell确实使用项索引作为其对象值，因此在willDisplayCell委托方法中没有该代码的情况下，部分内容应该可以正常工作。

顺便说一句，我建议使用菜单项的representedObject属性来告诉项目部分而不是标题。菜单项标题可能会被本地化，使用标题存储数据值非常容易破损。

将NSPopUpButtonCell与NSTableView一起使用

2 个答案: