delphi循环遍历同类控件或所有控件

循环遍历同类控件：

form1中有groupbox1，内有多个speedbutton,控制其同时按下。

var i:integer;

begin

for i:=0 to form1.groupbox1.controlcount-1 do

if form1.groupbox1.controls[i] is tspeedbutton then

begin

tspeedbutton(form1.groupbox1.controls[i]).allow‍allup:=true;

‍tspeedbutton(form1.groupbox1.controls[i]).groupindex:=i+1;

tspeedbutton(form1.groupbox1.controls[i]).down:=true;

end;

结合数据库使用，表示表rz中的rz字段（bit），为1则按下，为0则抬起。

var i:integer;

begin

i:=0;

while not adotable1.eof then

if adotable1.fields[1].asboolen=true then

begin

tspeedbutton(form1.groupbox1.controls[i]).allow‍allup:=true;

‍tspeedbutton(form1.groupbox1.controls[i]).groupindex:=i+1;

tspeedbutton(form1.groupbox1.controls[i]).down:=true;

end

else‍

begin

tspeedbutton(form1.groupbox1.controls[i]).allow‍allup:=true;

‍tspeedbutton(form1.groupbox1.controls[i]).groupindex:=i+1;

tspeedbutton(form1.groupbox1.controls[i]).down:=false;

end;

inc(i);

adotable1.next;

end;

遍历Panel组件上的所有控件：

procedure frmMain.CLS; //主窗体自定义事件CLS
var i:integer;
begin
  for i:=0 to panel5.ControlCount -1 do
  begin
    if panel5.Controls[i] is TEdit then  //Edit组件
    begin
       ((panel5.Controls[i]) as TEdit).Text:='';
       ((panel5.Controls[i]) as TEdit).Enabled:=true;
    end  else if panel5.Controls[i] is TComboBox then  //ComboBox组件
      begin
         ((panel5.Controls[i]) as TComboBox).Text:='';
         ((panel5.Controls[i]) as TComboBox).Enabled:=true;
      end  else if panel5.Controls[i] is TDateTimePicker then  //DateTimePicker组件
        begin
          ((panel5.Controls[i]) as TDateTimePicker).Enabled:=true;
          ((panel5.Controls[i]) as TDateTimePicker).DateTime:=now();
        end; 
    end;
end;
这个过程主要是清空panel5组件Edit、ComboBox组件Text内容、把DateTimePicker组件日期设为当前日期，并使panel5所有控件可用 ......