Can I refer to components using variables in Delphi?

Question

I have many TLabels, and instead of manually changing their .Captions I'd like to do it in code. Something like

lbl[i] 

instead of manually

lbl1 := x; 
lbl2 := y;

Answer 1

If you are using the IDE to create the labels then you have two choices:

1. Use your own array:

   // in public or private
   var Labels : array [1..2] of TLabel;
   
   // in OnFormCreate or similar event
   begin
     Labels[1] := Label1;
     Labels[2] := Label2;
   end;
   
   // somewhere else
   var
     lLabel : TLabel;
   begin
     for lLabel in Labels do lLabel.Caption := 'xyz';
   end;
   

2. Use the TForm.Control array of the Form you're currently in:

   var
     I : integer;
     lControl : TControl;
   begin
     for I := 0 to ControlCount-1 do 
     begin
       lControl := Controls [I];
       if lControl is TLabel then (lControl as TLabel).Caption := 'xxx';
     end;
   end;