删除在运行时创建的TLabel

时间:2012-11-21 00:35:59

标签: delphi runtime

如何删除已创建的标签,我google了很长时间但没有显示!我尝试了FindComponent但是faild,我必须做什么?我应该将父母设置为其他组件,如TPanel或什么?我感到很困惑!

procedure TForm1.Button1Click(Sender: TObject);
var
lblLink : TLabel;
begin 

   for i := 0 to stringtList.Count-1 do
   begin 

      lblLink := TLabel.create(self);

           with lblLink do
           begin

             name:='lblLink'+inttostr(i);
             caption:inttostr(i);
             Parent := self;
             font.style := [fsUnderline];
             cursor := crHandPoint;
             color := clBlue;
             font.Color := clBlue;
           end;
    end;
end;

3 个答案:

答案 0 :(得分:10)

您可以迭代Components属性,然后检查组件的名称,最后释放组件。

Var
  LIndex : Integer;
  LComponent : TComponent;
begin
  for LIndex := ComponentCount-1 downto 0 do
    if StartsText('lblLink',Components[LIndex].Name) then
    begin
     LComponent:=Components[LIndex];
     FreeAndNil(LComponent);
    end;
end;

答案 1 :(得分:3)

你不必释放它。您有责任将其释放到lblLink := TLabel.create(self);的表单中。表单将在表单释放时释放标签。

然而,话虽如此,您可以通过循环遍历表单的Components数组来释放它:

procedure TForm1.DeleteLabel(const LabelName: string);
var
  i: Integer;
begin
  for i := ComponentCount - 1 downto 0 do
  begin
    if Components[i] is TLabel then
      if Components[i].Name = LabelName then
      begin
        Components[i].Free;
        Break;
      end;
  end;
end;

答案 2 :(得分:3)

您为每个Owner分配了ParentTLabel,因此从技术上讲,您根本不需要释放它们。所有者和家长都将为您处理。但是,如果您想提前释放它们,则可以遍历所有者的Components列表或父级Controls列表,手动搜索标签。更好的选择是保留您自己创建的标签列表,然后您可以在需要时循环遍历该列表,例如:

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
  ...
  private
    Labels: TList;
    procedure FreeLabels;
  ...
  end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Labels := TList.Create;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  Labels.Free;
end;

procedure TForm1.FreeLabels;
var
  I: Integer;
begin
  for I := 0 to Labels.Count-1 do
    TLabel(Labels[I]).Free;
  Labels.Clear;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  lblLink : TLabel;
  ...
begin 
  ...
  for I := 0 to StringList.Count-1 do
  begin 
    lblLink := TLabel.Create(Self);
    try
      with lblLink do
      begin
        Name := 'lblLink' + IntToStr(i);
        Parent := Self;
        Caption := IntToStr(i);
        Font.Style := [fsUnderline];
        Cursor := crHandPoint;
        Color := clBlue;
        Font.Color := clBlue;
      end;
      Labels.Add(lblLink);
    except
      lblLink.Free;
      raise;
    end;
  end;
end;