Form1调用Unit2类中函数

Form1有一个button，当Form1.Create时触发Button的OnClick事件，OnClick事件调用Unit2单元中的函数；

unit Unit2;  

interface
  uses FMX.Dialogs, FMX.StdCtrls;

type
  TBClick = class
  private

  public
    procedure BClick(Sender: TObject);

  end;

implementation

{ BClick }

procedure TBClick.BClick(Sender: TObject);
begin
  ShowMessage('hello');
end;

end.

unit Unit1;

interface

uses
  System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants,
  FMX.Types, FMX.Controls, FMX.Forms, FMX.Graphics, FMX.Dialogs,
  FMX.Controls.Presentation, FMX.StdCtrls;

type
  TForm2 = class(TForm)
    Button1: TButton;
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form2: TForm2;

implementation
uses
  Unit3;

{$R *.fmx}

{ TForm2 }

procedure TForm2.FormCreate(Sender: TObject);
var
  bclick: TBClick;
begin
  Button1.OnClick := bclick.BClick;　　
  Button1.OnClick(Sender);　　　　　　　　// hello
end;

end.